User Manual - Rotary-engine Compression Tester System
Contents
1. engines Troubleshooting Problem When I connect the power cord to the battery the green LED power on indicator does not light and the system does not function Answer Double check the battery clip attachments and make sure the red clip is attached to the positive plus pole of the battery and the black clip is attached to the negative minus pole If the connections seem to be in order disconnect the battery clips and remove the enclosure cover Check to see if the 1A fuse is blown If it is replace it with a comparable fuse and see if the system now powers up If the fuse is not blown or if you replaced it and the system still does not power up try connecting the system to another known good 12VDC battery If none of that solves the problem contact the RDS for assistance Problem When I run the test nothing is recorded by the Hardware Manager Answer First carefully scan through the entire data record using the WinDaq Waveform Browser to verify that nothing was recorded Remember if the recording ran for say 60 seconds a 5 second burst of compression pulses may be difficult to locate in the data stream So scan the data to verify that the compression data is in fact not there If it is definitely not there then go through a full test setup as follows Shut down the Hardware Manager program disconnect all cables and basically start over Plug the USB cable into the DATAQ port on the side of the enclosure and launch the Hardwa2. User Manual Model ReCT 04 The Rotary engine Compression Tester Rotary Diagnostics Systems P O Box 524 Mont Alto PA 17237 USA http RotaryDiagnostics com Copyright 2014 by RDS Using the Rotary engine Compression Tester System Introduction The Rotary engine Compression Tester can be used to obtain accurate engine compression measurements in a rotary i e Wankel engine The Tester combines the output from an AST pressure transducer with the data conversion function of a DATAQ analog to digital device to acquire and record accurate compression readings for each face of each rotor in a rotary engine This system also allows the calculation of engine cranking RPM during the test for data normalization 1 Main enclosure w A D converter 2 Pressure transducer quick coupler 30 cable 3 Spark plug hole adapter 4 Power cord 12 VDC 5 USB cable 6 6 WinDaq programs disk 7 User manual not shown Figure 1 Rotary engine Compression Tester system Model ReCT 04 components This system is useful in helping to diagnose suspected engine related issues to monitor engine health over time and to demonstrate engine health in real time A windows computer preferably a notebook laptop with an available USB port is required for use with this system A computer is not included with the tester For connecting the tester to a remotely located computer a USB extension cable up to 10 feet in length can be used
3. a precision instrument and should be handled accordingly While the unit is not fragile extreme mishandling especially involving high lateral G forces may damage the internal sensor elements in the pressure transducer rendering it inoperable Plug the power cord into the connector on the side of the enclosure and connect the battery clips to the appropriate battery terminals Red Pos Black Neg or another 12VDC power source Be very careful when making this connection Connect red clip to positive battery post then black clip to negative battery post Remove in reverse order when the test is completed Verify that the green LED power indicator is lit If it is not see the Troubleshooting section Boot up your computer fully and connect the USB cable to the Tester enclosure and to the computer Launch the Hardware Manager program from the Start gt Programs gt WINDAQ program group Select the DI 145 when it appears in the list and click Start WinDaq Bi DATAQ Instruments Hardware Manager Allow 15 seconds for devices to appear Description Status Serial IP Address 4F 662410 Available 46 662413 N A v1 52 Settings for 4E66241D v PERREN oHe Figure 13 Hardware Manager hardware listing of DI 145 11 10 Verify that the Scaling gt Limits upper and lower limits are 200 and 0 or 00 respectively If they are not you will need to run through the Hardware Manager configuration again befo
4. ain support for this system Installing the DATAQ software The software installation and configuration task involves the following steps 1 Installation of the hardware drivers and the WinDaq programs associated with the DI 145 data converter unit 2 Configuration of the DATAQ Instruments Hardware Manager The main programs associated with the DI 145 data converter are the DATAQ Instruments Hardware Manager hereinafter referred to as the Hardware Manager and the WinDaq Waveform Browser The Hardware Manager is used to record the compression data during the test and the WinDaq Waveform Browser is used to view extract and analyze the compression readings The hardware drivers and both programs are provided on The WinDaq Resource Disk and must be installed on your computer If you have basic computer skills you can probably work through the install process with little or no assistance Otherwise refer to Appendix A for step by step instructions Do not connect the main enclosure to your computer at this time During the install process you will be instructed when to connect the main enclosure To begin software installation insert the WinDaq Resource Disk into your CD DVD drive The install program should start automatically If it does not navigate to your CD DVD drive and double click on the exe file Follow the instructions on each succeeding install window When asked if you want to install WinDaq XL select No Tha
5. dit gt Channels EJ DI 145 Acquisition 4E662410 lt lt ea 2 2 28 File View Scaling Options Help Mode a S s uone amz prage used Copy Ctrl C f Sample Rate F3 Channels F5 Channel Settings F10 Engineering Unit Settings Ctrl F8 Reset EU Ctrl F12 User Annotation Alt Fll Insert Mark Ctrl Space Insert Commented Mark Shift Space tal Compression F7 Compression x2 Page Up Compression 2 Page Down Preferences a ___ _ _ Wl oo qiejt de iS ied Comes Go oe S s CHAN 60 sec DIV 0 333 Status SET UP Figure 2 Hardware Manager channel selection All settings in the Hardware Manager are specific to the System hardware and are usually retained for future tests See note on page 10 for more information At the blinking cursor type 4 and press enter Type 3 and press enter Type 2 and press enter You may have to use the minus and number keys at the top of the keyboard rather than the keypad Channels 1 2 3 4 Ch Figure 3 Selecting only 1 channel to record Verify that only the number 1 is shown adjacent to Channels Figure 4 One channel selected NOTE It is important that only one channel is shown since the maximum total throughput sampling rate of 240 samples second S s is divided by the number of channels activated For example if 4 channels are activated the sample rate for your one channel test will be reduced to 60 S s
6. e port and the USB port on your computer You should hear the USB connect tone when the cable is plugged in You are now ready to configure the Hardware Manager program Return to page 4 to complete the software configuration If problems are encountered with the this procedure try the Alternate Tester System instructions below Alternate Tester System software installation Go to the latest software download page http www dataq com support installation instructions html Follow the instructions on that page which includes an imbedded link to download the WinDaq software Congratulations You have successfully installed all the software required by the System You can remove the Resource Disk from the computer drive but if you plan to complete the Hardware Manager configuration at this time you can leave the System enclosure connected to your computer Return to page 4 when ready to configure the Hardware Manager program and complete the software installation and configuration process 21
7. ifications 15 x in the simple ratio of 9 1 84 x 60 where x equals engine cranking RPM at the time of the test That is 1 84x 9 60 therefore x 540 1 84 or 293 2 WINDAQ 20060612 wdq File Edit View Search Scaling Transform XY Options Help Sec i e for 9 eccentric shaft revs i e peak 0 to peak 9 1 84 sec 129 03 127 19 9 eccentric shaft revs 3 rotor revs 9 compressions Simple rai jo calculation 9j 1 84 x 60 293 RPM ee ee UV 25 050 SEC TM 83 5 EOF T 083 SEC DIV 127 19 sec 129 03 sec Figure 17 Example of engine cranking RPM calculation z WINDAQ FRONT 3 16 07 WDQ File Edit View Search Transform XY Options Help 200 00 VARY 27 542 SEC TBF 10 754 SEC TM 71 9 EOF T 083 SEC DI 00 Figure 18 Indication of healthy engine front rotor readings from 3 generation RX 7 If any rotor faces are well below the Mazda minimum standard your engine probably requires rebuilding or replacement The example below Figure 19 was recorded from the same 3 generation RX 7 engine as the above example but as you can see compression readings for two of the rear rotor faces are significantly lower than the third face and well below the Mazda minimum This is definitely an indication of seal failure and the engine will need to be rebuilt or replaced Obviously if any of the recorded readings a
8. l 1 Engineering Una Settee Volts Upper Level A Ss 200 2 COC S Lower Level Z Wooo psi Previous Lox Next Set Offset Cancel Figure 7 Hardware Manager Engineering Unit Settings Edit gt Engineering Unit Settings yes again Verify settings Click on Set Offset Enter 0 in the Desired Reading box Click OK then OK again to complete this setting Channel 1 Engineering Unit Settings xs Volts EU EUTag Upper Level Z 5 200 2 C Lower Level Z it 0 Previous OK Next Set Offset Cancel P au psi Set Channel 1 Offset Change Current Sampled Value to any desired reading within the engineering units range The difference is applied as an offset across the entire measurement range Click Cancel to revert without changes Current Sampled Value 020 Desired Reading cnc Figure 8 Hardware Manager Engineering Unit Settings Set Offset Scaling gt Limits Top Limit 200 Bottom Limit 0 may show as 00 Click OK Channel 1 Display Limits Top Limit 200 Bottom Limit fo Figure 9 Hardware Manager scaling limit setting Edit gt Sample Rate Undo Ctrl Z Copy Ctrl C Sample Rate F3 Channels F5 Channel Settings F10 Engineering Unit Settings Ctrl F8 Reset EU Ctrl F12 User Annotation Alt F11 Insert Mark Ctrl Space Insert Commented Mark Shift Space Compression F7 Compression x2 Page Up C
9. ld normalize the readings in order to compare them to the Mazda engine specifications Normalizing the recorded data Mazda specifications for engine compression are generally specified with an engine cranking speed of 250 RPM If your engine cranking speed see below for how to calculate engine cranking speed during the test is close to 250 RPM you can use the readings as recorded However if engine cranking speed deviates significantly from the Mazda criteria you may want to proceed with normalization of the recorded readings Essentially slower engine cranking RPM during the test will result in readings lower than the Mazda standard Mazda workshop manuals provide simple graphs that can be used for this purpose Be aware that our systems do not compensate for differences in atmospheric pressure due to elevation or weather conditions Mazda shop manuals for some models include a graph for elevation altitude correction Comparable graphs are available on various web sites including Wikipedia com The following instructions provide procedures for calculating engine cranking RPM from the recorded data to convert the readings for comparison to the Mazda specification Engine RPM calculation As stated above to normalize the measured compression readings the engine cranking RPM at the time of the test must be determined Using the WinDaq Waveform Browser the engine cranking RPM during the test can be determined by measuring elapsed
10. mple WINDAQ 20060612 wdq File Edit View Search Scaling Transform XY Options Help L225 sae SEC TBF 24 438 SEC TM 83 9 EOF T 083 SEC DIV 00 Figure 16 Sample recorded compression readings for a single rotor To move the line cursor place the mouse cursor on the DATA bar at the bottom of the display directly below the line cursor hold down the left mouse button and drag the line cursor to the desired position in the display Move the line cursor left and right slightly until the maximum reading for the peak of interest is shown at the left After you have read and made note of a meaningful series of peak pulses you can easily calculate the differences between the compression readings of rotor faces and between rotors in order to compare the readings with the engine manufacturers specification To spread out the peaks for a clearer display of the data select Edit gt Compression from the menu and type in a negative number like 2 in the Compression box Higher negative numbers will spread out the display even further The term compression as used here refers to data display compression not engine compression However if the engine cranking speed at the time of the test was significantly higher or lower than 250 RPM you shou
11. nks WinDaq XL is an add on program which requires an additional purchase and it is not required for this application The installation of hardware drivers and programs is a one time exercise If you have successfully completed the driver and software installation you can proceed with configuring the Hardware Manager These instructions apply specifically to the DATAQ DI 145 the associated WinDaq Lite program and AST4000 pressure transducer 0 200 PSI 10 28VDC input 1 5 VDC output This task does not require access to a vehicle It can be completed anywhere as long as the system enclosure is connected to the computer using the supplied USB cable to a 12 VDC power source and to the pressure transducer 3 Hardware Manager Configuration To begin the Hardware Manager configuration connect the main enclosure to the computer using the USB cable provided Then connect the pressure transducer quick coupler to the enclosure and connect the power cord to the enclosure and to any 12VDC power source usually the car battery If you installed the DI 145 drivers successfully the operating system will automatically activate the drivers for the DI 145 when the cable is plugged into the USB port Launch the Hardware Manager program from the Start gt Programs gt WinDaq program group menu When the devices list appears highlight the DI 145 device and press the Start WinDaq button Continue with the following settings E
12. ntially involve component warranty claims must be handled through RDS Do not contact component manufacturers directly without first contacting RDS for assistance Support services and warranties on individual system components fall to the original component purchaser namely Rotary Diagnostics Systems For further guidance contact RDS 20 Appendix A Tester System software installation The following instructions are for installing the hardware drivers and programs on computers running Windows operating systems Power up your computer and allow it to fully boot up Do not connect the main enclosure to your computer at this time Insert the WinDaq Resource Disk into your CD DVD drive The WinDaq install program should launch automatically and bring up the first install process window Follow the instruction in each succeeding window When asked if you want to install WinDaq XL select No Thanks WinDaq XL is an add on program which requires an additional purchase and it is not required for this application If the program does not launch automatically navigate to your CD DVD drive and double click on the exe file to launch the program The exe file should be named something similar to dataq_starterkits exe Your Resource Disk may contain a more recent install file by a slightly different name When instructed connect the enclosure to your computer using the supplied USB cable Make sure the cable connects securely into the enclosur
13. o sale Any modifications to this system by anyone other than RDS totally voids the stated warranty The customer is authorized to remove the enclosure cover to check and or replace the fuse if necessary No other servicing of or modifications to the Tester by the customer are authorized Beyond the stated warranty RDS is not liable for any system failures due to improper or abusive use of the system For example reversing battery connections resulting in component damage constitutes an improper use of the Tester Nor is RDS responsible for resultant damage to an engine or engine component due to misuse of the Tester system CAUTIONS Do not attempt to disassemble the spark plug hole adapter item 3 Figure 1 The threads are sealed with an epoxy and any attempt to separate the components will almost certainly render this component inoperable requiring replacement at the owners expense In addition the pressure transducer Item 2 Figure 1 in this system is a precision instrument and should be handled accordingly While the unit is not fragile extreme mishandling especially involving high lateral G forces or excessive stress on the cable may damage the internal elements and render it inoperable The pressure transducer is not user serviceable and attempts to disassemble or modify it in any way will likely result in an inoperable system and will definitely void the warranty NOTICE Customer service requests particularly those that pote
14. ompression 2 Page Down Preferences sec DI 0 333 Status SET UP Figure 10 Sample rate selection Make sure that the Sample Rate is set at 240 If it is not type in 240 Input Buffer Size in KiloBytes 0 Disk Buffer Size in KiloBytes 64 Sample Rate Zo OK Cancel Figure 11 Sample rate setting gt The default maximum total throughput sample rate for the WinDaq Lite program supplied with this system is 240 samples second Use the default rate for the most pleasing data display 9 Verify that the per channel S s rate setting in the lower left of the display S7s CHAN 240 Figure 12 Sample rate set at 240 S s Do File gt Save default setup and you have completed configuration of the Hardware Manager see Note below You are now ready to conduct compression tests To conduct a test follow the instructions on the next few pages Note The settings just configured are associated only with the specific DATAQ unit installed in the enclosure Each System has a unique serial number that is the same as the DATAQ unit serial number Note that the unit System serial number is listed along with the DATAQ unit description in the main hardware windows The configuration settings completed above will normally be retained in your computer for future use However if you are not planning to conduct a test now we strongly advise that you run through the configuration procedure again as part of your p
15. plitude What does that indicate Answer In order to answer that question you must first extract and compare the readings from all rotor faces Then consult the appropriate workshop manual to determine the engine compression specifications for your particular engine to see if the readings fall within the manufacturers limits for a healthy engine In general however if the differences in the compression readings between rotor faces and or between rotors are significant your engine is less than healthy And depending on the specific compression numbers your engine may require rebuilding or replacement Problem When I launch the Hardware Manager program the DATAQ device is recognized but when I click on Start WinDaq I get an error message Answer Occasionally internal program component linkages are lost or the installation of a program or security fix after installation of the DATAQ software will modify a required component of the program Try rebooting the computer and if that doesn t eliminate the error reinstall and configure the DATAQ software Also if you disconnected the USB cable after starting the Hardware Manager program the program will almost certainly freeze or show an error message If this is the problem reboot the computer and restart Hardware Manager Otherwise uninstall the WinDaq programs reboot the computer and reinstall the latest version of the software A link to the latest software can be found at the bo
16. re Manager program Run through the instructions in the section entitled Hardware Manager Configuration to verify that the program is configured correctly Note the USB cable must be connected to the DATAQ port and to the computer before launching the Hardware Manager program If still no data is recorded contact the RDS for further instructions Problem The test seems to run OK but the data shows what look like irregularly spaced compression pulses Answer Compare your recording to the sample record in Figure 18 As you can see in the sample the compression pulses are very regularly spaced and similar in amplitude If your recorded data shows what would be gaps where a pulse or pulses should be shown this is probably due to lack of compression on one or more rotor faces most likely the result of one or more failed failing seals If you like you can e mail a copy of the wdq file to RDS for evaluation Problem I ran the test but the data is difficult to read because the pulses are too close together Answer The sample rate during the test may have been inadvertently set too low Either re run the test at 240 samples second see page 9 or set the data display compression as instructed at the top of page 15 Re running the test at the higher sampling rate will result in a smoother display of the data if it had been run at a slower sample rate Problem My recorded readings show compression pulses with differences in am
17. re proceeding 11 Select File gt Record from the Hardware Manager menu to start data recording Select a folder for storing the data file and name the file something meaningful like the car year and model and the date then click Open EE Open OW E Desktop gt Search Desktop Organize v New folder Sr Faroes Name i Size Item type Date modified E Desktop S Libraries J Downloads 3 Homegroup i Recent Places 3 aB larry 7 Computer T Libraries Gu Network Documents Ji Auto Stuff a Music d Business E Pictures Directories E Videos d Garmin d Genealogy 28 Homegroup d Medical Stuff J Ozone jE Computer dL Penton Manuals File name my WinDaq Files WDQ i Sg te oe et Figure 14 Hardware Manager Record file name selection 12 Select the recording time file size desired and when you are ready and only when ready to conduct the test and to start the recording click OK Continue with Conducting the test section that follows when ready File Size File Size in KiloBytes At a sample rate of 240 Sjs Recording Time in hours min Jsec 0 12 46 OK Cancel Figure 15 Hardware Manager recording time and file size selection To pause the recording at any time during the test do File gt Stop To resume recording do File gt Record To completely stop recording do File gt Close or File gt Exit 12 Conducting the test Now that your car has been p
18. re at or near zero your engine is definitely sick and will need to be rebuilt or replaced For questionable compression readings it is advisable to run additional tests to verify the numbers and to verify that you prepared the tester system correctly for a test with questionable results m WINDAQ REAR 3 16 07 WDQ 200 00 6 900 SEC TBF 31 396 SEC TM 18 0 BOF T 083 SEC DIV 4 Figure 19 Evidence of failed seal rear rotor readings from 3 generation RX 7 In the shop manual for the second generation RX 7 Mazda states the compression specifications for the 13B engine at sea level with engine cranking speed of 250 RPM The minimum compression for this engine is given as 85 PSI So in general compression higher than that should indicate a relatively healthy engine Mazda also indicates that the maximum difference between the rotor faces should be no more than 21 PSI The workshop manual for the RX 8 states the standard compression as 120 PSI at 250 RPM and the minimum as 98 6 PSI at 250 RPM Standard difference in chambers should be within 21 8 PSI and difference between rotors within 14 5 PSI Readings outside of those levels i e lower compression readings or greater difference in readings between rotor faces or between rotors indicates a less than healthy engine that may require rebuilding or replacement in the near future Consult the appropriate workshop manual for compression specifications for other rotary
19. recorded data can now be viewed and analyzed using the WinDaq WaveForm Browser as described in the following sections Extracting and interpreting the data Launch the WinDaq Waveform Browser from the Start gt Programs gt WinDaq program group and open the wdq file created during the test Using the slider at the bottom of the window scan for and locate the recorded compression pulses A helpful hint is in order at this point The total record time for the test is likely to be several minutes long and a 5 second burst of compression pulses therefore may be difficult to locate or keep track of in the data record Before concluding that no data was recorded scan the entire record for the compression pulses It actually may be there somewhere essentially hiding in the long data record A cursory examination of the recorded data will quickly reveal any significant problems with engine compression The absence of pulse peaks where expected or very low compression readings are indications of rotor seal failure and one need go no further with data extraction and analysis The engine will likely require rebuilding or replacement However additional compression tests should be conducted to verify any questionable numbers See the section Meaning of the compression readings for additional information 7 You may choose to have someone else do this part while you monitor the tester connections and computer 8 This is optional but yo
20. reparation to conduct a test when all tester components are connected and powered up 10 Conducting the compression test Preparing the vehicle and recording program 1 Warm up the engine If using the car battery as the power source it should be fully charged 2 Remove one of the spark plugs either leading or trailing in one of the rotor housings Do not remove any other spark plugs Disable engine ignition and fuel delivery systems If you are not sure how to do this consult a workshop manual for your particular vehicle to determine the best method for disabling these systems For most modern fuel injected rotary engines that can be accomplished by removing the EGI fuse s from the engine compartment fuse box However in the case of the RX 8 Mazda recommends disconnecting the Eccentric Shaft Position Sensor located at the lower front left of the engine to disable these systems Screw the spark plug hole adapter into the plug hole Make sure the adapter is screwed in finger tight but snugly and that the O ring is sealing Do not over tighten You can use a little silicone based grease like dielectric grease for example to lubricate the O ring and facilitate sealing But DO NOT use a petroleum based oil or grease on the O rings Connect the pressure transducer quick coupler to the adapter and to the enclosure using the attached cable and DIN connector NOTICE The pressure transducer used in this system is
21. repared for the test all the data and power connections have been made and the Hardware Manager program has been set up and ready to record you are ready to conduct the test 1 Check all your connections before proceeding and make sure the ignition and fuel delivery systems have been disabled Note Make sure all connections are well clear of engine rotating parts 2 Start the recording function in Hardware Manager Click OK as instructed in item 12 above 3 Get in the car depress the gas pedal to the floor important and activate the starter for about 5 seconds 4 Put the software on standby File gt Stop 5 Remove the spark plug hole adapter from the first rotor plug hole and reinstall the spark plug Remove a spark plug from the other rotor housing screw in the adapter and attach the pressure transducer quick coupler Resume the Record function in the Hardware Manager program File gt Record Get in the car depress the gas pedal to the floor and activate the starter for about 5 seconds 8 Stop recording File gt Stop The test is completed so you can save the recording File gt Exit Exit the Hardware Manager program disconnect all cables and remove the adapter If the Hardware Manager device selection window is still open close it 9 Reinstall the spark plug reconnect the spark plug wires and enable the ignition and fuel delivery systems You have completed the data acquisition part of the test a The
22. resulting in a very notchy looking trace Accuracy will not be significantly affected but the data display will appear to be very crude View gt Format Screen Select 1 Waveform 22 DI 145 Acquisition 4E662A1D File Edit Scaling Options Help Mode Osi Assign Channel S s_ F3 10 2 Assign Range Forward Range Ctri Down Backward Range Ctrl Up Format Screen gt V 1 Waveform Next Palette 2 Waveforms overlapped Previous Palette User Palette 2 Waveforms 4 Waveforms overlapped 4 Waveforms 8 Waveforms overlapped Channel Properties Ctrl F10 8 Waveforms 16 Waveforms overlapped 16 Waveforms 32 Waveforms overlapped Add ons User specified format 9 800 S s CHAN 240 ms DI 83 3 Status SET UP Figure 5 Hardware Manager screen display setting Edit gt Engineering Unit Settings FJ 01 145 Acquisition 46662410 ili en Undo Ctrl Z Copy Ctrl C Sample Rate F3 Channels F5 Channel Settings F10 Engineering Unit Settings Ctrl F8 Reset EU Ctrl F12 User Annotation Alt F11 Insert Mark Ctrl Space Insert Commented Mark Shift Space Compression F7 Compression x2 Page Up Compression 2 Page Down Preferences sec DIV 0 333 Status SET UP Figure 6 Hardware Manager Engineering Unit Settings Upper Level Volts 5 volts Upper Level EU 200 Lower Level Volts 1 Lower Level EU 0 EU Tag PSI Click OK Channe
23. time between a number of compression peaks and converting that to the equivalent revolutions of the eccentric shaft per minute Note For the highest accuracy use a series of compression peaks near the middle of recorded data to eliminate any start up lag at the beginning of the test and possible minor battery voltage drop off near the end of the test Using the example in Figure 17 for reference calculate the engine RPM as follows First place your cursor in the DATA bar at the bottom of the display directly below the line cursor on the screen Holding the left mouse button down move the cursor to one of the compression peaks and record the time displayed at the lower left corner of the window In the example the elapsed time at peak 0 is 127 19 rounded from 127 188 seconds Move the line cursor 9 peaks further along the data record i e peak 9 recording the time 129 03 Subtracting 127 19 from 129 03 gives an elapsed time of 1 84 seconds Since this span of pulses equates to 9 compression cycles or 9 eccentric shaft revolutions i e 3 eccentric shaft revolution per rotor revolution x 3 the elapsed time of 1 84 seconds equates to the elapsed time for 9 eccentric shaft revolutions In the example engine RPM calculation is determined by solving for 10 This discussion assumes that the Tester is being used with a Mazda rotary engine For other rotary engines consult the appropriate workshop manual for engine compression spec
24. ttom of the following page on our web site http www rotarydiagnostics com pricing 20combined htm NOTE Rotary Diagnostics Systems has made a good faith effort to build and deliver a working test device that will provide accurate compression measurements for many years However we strive constantly to improve our products so your constructive criticisms and your suggestions will be greatly appreciated Do not hesitate to contact the RDS if you have problems with the system or if you would like to pass on any comments Contact Information For assistance or questions contact Larry at Rotary Diagnostics Systems P O Box 524 Mont Alto PA 17237 USA 717 352 7096 In case no one answers leave a message and you will be contacted ASAP 717 360 3633 cell Rotary13b RotaryDiagnostics com http RotaryDiagnostics com Warranty The Tester is warranted for a period of one year from the date of purchase This warranty is limited to repair or replacement of any components necessary to restore the system to full functionality Rotary Diagnostics Systems RDS will restore the system to full functionality at no cost to the customer unless the malfunction is the result of improper use or abuse of the Tester In rare cases the Tester may be replaced with a new system at the option of RDS Contact RDS for instructions on returning a system for service or for a warranty claim Safe and effective operation of each unit is verified prior t
25. ur data record will be much longer if you don t pause the recording when switching plug holes and you may have difficulty keeping track of the compression pulse locations in the record Disconnecting tester hardware from the computer before closing the programs may cause your computer to freeze requiring a reboot 13 Significant differences between the peak pulse amplitudes is also an indication of failing rotor seals and depending on the extent of the difference this may also be an indication the need to rebuild or replace an engine In this case continue with data extraction and analysis to determine the relative health of the engine Proceed with the following instructions to extract the recorded values and to normalize the data for comparison to the vehicle manufacturers specifications Only then can the recorded readings be used to determine the exact status of engine health Referring to the sample record in Figure 16 note that the compression pulses are represented by the peaks in the recording each peak representing a compression pulse of a single rotor face The compression of each rotor face is repeated every third pulse The maximum compression of each face is represented by the peak value at that point in the test Peak compression readings for each rotor face are viewed by moving the line cursor in the display to the peak of each pulse and noting the compression number displayed at the left side of the window 119 44 PSI in the sa
26. with the supplied cable USB extension cables are available from a number of sources including RDS http rotarydiagnostics com Do not exceed 16 feet total length of any USB cable or cable extension combination It should be clearly understood that this system requires installation and configuration of software and manual extraction of the compression readings and engine cranking RPM from the recorded data The readings are not automatically presented to the user as is the case with much more expensive rotary engine compression testers Users with basic computer skills should have no problem installing and operating this system This user manual contains all the information you will need to install and configure the associated software and to operate the system to conduct a compression test on your rotary engine However should you wish to know more about the DATAQ data conversion hardware or the WinDaq software manuals for both are installed on your computer with the programs and are available via the WINDAQ program group under the Programs menu WinDaq is a registered trademark of DATAQ Instruments Inc You can also go to the DATAQ web site for more information Links to that site as well as to the AST web site are in the References section of this manual All support for the Tester is provided by RDS The user should not contact the component manufacturers directly for support See the Warranty section for instructions on how to obt
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