JC 30EVO User Manual SPECIFICATIONS: Operating Instructions
Contents
1. be drawn into the turning prop causing injury or damage Always operate the motor in an open or well ventilated area These motors develop substantial thrust levels so ensure that the aircraft or test bench is properly secured when starting or operating the motor Regularly check the motor and propeller mounting bolts It may be wise to wear ear protection during extended ground running Always keep people and animals behind the propeller arc not in front or to the side of the propeller and keep spectators at a safe distance away when operating the motor Stop the motor before making any adjustments Always use the correct length propeller bolts not too long or too short Spinner cones must never touch the propeller maintain at least a 1mm clearance all around We recommend the use of an ignition kill switch to stop the motor as well as setting up the carburetor linkage so that the motor will stop when the throttle and trim is completely closed Petrol is flammable Be aware of potential sources of sparks from electrical contacts such as fuel pumps battery chargers etc Store fuel in appropriate containers and mix or use in well ventilated areas The ignition system develops extremely high voltage Do not touch it during operation Primed engines have been known to fire from standstill when the ignition is switched on Please stay clear of the propeller when switching on the ignition and always ensure that the ignition is tu2. Be aware that products such as LOCTITE RED 262 272 277 are considered permanent and require specl treatment to remove ial Propeller bolts should be applied without thread lock as they should be re tightened or checked regularly Similarly bolts passing through a wooden firewall should be checked regularly JC Engines are not sensitive to orientation and can thus be mounted in the position best suited to the particular installation cowl shape fuel tank location etc JC Engines are not sensitive to fuel tank position thus the fuel tank can be located anywhere in the model to suite the available space CG scale detail etc It is however important to point out that fuel may siphon from the fuel tank out of the carburetor overflow breather whilst the engine is not operating if the fuel level in the tank is higher than the fuel inlet on the carburetor overflow breather when the model is parked or stored This could be a fire hazard and or cause damage to the model the more so if the engine is mounted with the carburetor behind the firewall see below Single cylinder JC Engines feature rear induction in the interest of performance and a smaller frontal profile you may mounted directly onto the firewall with a suitably sized hole in the firewall placing the carburetor behind the firewall Alternatively the engine can be mounted onto the firewall by means of the engine mount stand offs provided Either way ensure a clear passage
3. JC 30EVO User Manual Model Airplane Engines SPECIFICATIONS e 2 Stroke air cooled single cylinder single ring e Walbro membrane pump carburetor with dual needles and manual choke e Automatic advancing electronic ignition e Output Power 4 0 hp at 9000rpm e Idle Speed 1300 rpm e Maximum Speed 9000rpm e Displacement 30 cc e Bore and Stroke 36mmx30mm e Weight Engine 920g Exhaust 90g Ignition 120g e Propeller 17 8 to 20 6 e Ignition Battery 4 8 to 6 0 Volts typically 1200Mah e Replacement Spark plug NGK CM 6 or equivalent Operating Instructions Thank you for purchasing our JC30EVO we hope it will bring you many hours of enjoyment It is important to familiarize yourself with these safety precautions as well as the operating instructions these engines can cause serious injury to people and animals This will help you avoid injury or harm to yourself other persons or animals JC ENGINE POWER CO LTD will not be held responsible for any loss injury or damage resulting from inappropriate use of its products you are responsible for the safe operation of your equipment Safety Instructions We recommend that you never operate the motor or fly alone Always be very aware of the propeller and its dangers while operating the motor Avoid distractions and loose clothing It is always a good idea to paint the propeller tips white or yellow propellers are near invisible when spinning Loose items or material can
4. ad or NiMH 4 cell pack has produced satisfactory results but there may be circumstances where a higher voltage is advantageous A 1 500mah pack is adequate for a typical flying session Please use the spiral wrap provided especially on the HT plug lead to prevent rubbing against fiberglass or other sharp edges Damage to the wire mesh shielding has been known to cause erratic engine operation as well as radio interference Whereas the propeller should be treated as potentially live and dangerous at all times it is uncommon for an engine with this ignition to backfire snap or bite The ignition will trigger a spark irrespective of the speed that the magnet passes the Hall Effect sensor so it is not necessary to flip the prop with all your might just flip it through compression and stay clear Pull the plug cap off straight when removing do not pull on the shielded ignition wires The spark plug cap must have the split retainer ring fitted flying without this retainer can cause RFI and unreliable operation There are mixed views regarding the safe proximity of the ignition components including switch and battery to the receiver and associated components Whereas we have a documented case where the ignition and receiver battery packs were actually placed together in the tank bay CG consideration on a 35 MHz installation without any problems we do suggest maintaining whatever separation may be available between the ignition and components an
5. d the receiver and components Spark Plug JC Engines are supplied Rcexl CM 6 spark plugs We have seen plugs of low quality on other engines but we have had no problems with the supplied plugs on any of the JC Engines despite many hours of operation Some experienced modelers recommend the use of NGK CM 6 these are available from your distributor Fuel and Oil Mix Just about any clean fresh petrol without moisture will work in your JC engine but unleaded petrol is recommended Some flyers have used Avgas without any problems but this offers no advantage is more costly and more difficult to locate petrol is available on every other street corner We recommend filtering your fuel between your fuel container and your fuel tank plus a high flow filter or clunk filter between the tank and motor Ensure that the tank is well vented and that the clunk moves freely without snagging on the back of the tank Use of any other fuel or additives such as methanol nitro formulas are not necessary and may harm the motor Do not use any silicon tubing or sealers anywhere in the fuel system as petrol will break it down causing leaks and poor engine operation For Break in we recommend a known brand of petroleum based 2 stroke lawn mower oil Use of high quality synthetic oils will only prolong the running in time on a JC engine in particular those engines with two large piston rings Outboard oil is not recommended for use in air cooled eng
6. for induction air to the carburetor These instructions do not attempt to address the integrity of the airframe structure other than to urge careful and regular inspection of the relevant materials and bonds It is important that the mounting plane surface is the same for all four attachment points i e the firewall is perfectly flat Cap head bolts and penny washers are provided for firewall mounting There is approx 20mm of thread in each engine mount pillar and 25mm cap head bolts are provided This allows up to 10mm for the firewall washers and spacers Please ensure that these bolts do NOT bottom out in the mounting pillars the bolts will not be holding the engine securely and the threads may be damaged Ensure that at least 6 mm of the bolt threads penetrate the mounting pillars 8mm is better Longer or shorter bolts are available Ignition Module Mount the ignition module in the fuselage or under the cowl Thick two layers double sided tape or a foam pad will provide vibration isolation and plastic cable ties should complete the task either way Do not hard mount Use the same gauge wire or larger as used on the red and black power leads on the ignition module all the way to the battery pack Keep wire lengths to a minimum Use a high quality switch such as a Futaba or JR switch Low cost budget switches are not recommended There are differing views regarding the use of a5 cell ignition pack All testing with a regular NiC
7. ines A mix ratio of 30 1 is recommended for the initial beak in period aprox 10 litres of fuel changing to 40 1 mix for a further 10 litres For best results allow the engine to run between 6 500 and 7 000 rpm with adequate cooling during break in and make sure that the engine is not operating on the lean side Thereafter continue operating on the 40 1 mineral oil mix or switch to one of the high performance two stroke oils for air cooled engines and mix according the oil manufacturer s instructions The engine should be set on peak Avoid the tendency to run rich as per glow motors this only serves to foul the plug and carbon up the cylinder Break In The JC 30EVO have single piston rings and will reward proper running in with good performance and a substantially longer life We don t believe in lengthy bench running and would far rather see the engine flying at varying throttle settings but not subjected to hard flying for the first two hours that is really only eight 15 minute flights Propellers Always check the prop bolts and inspect your prop and spinner before each flight The bolts should be checked for correct tightness and not tightened more and more each time While special break in props are not required avoid loading down the engine during the break in period as above let the engine spool up The safest way to drill mounting holes in a propeller is to use a drill guide for your engine The next best is to use a d
8. off the fuel supply by pinching the fuel line or removing it from the carb and flipping with the choke closed until it fires and runs Let it run dry then start again The spark plug can also be removed and dried to check if it was flooded and to speed the drying out process Needle Adjustments The needle closest to the firewall H is the high speed needle the other one L is the low speed needle Turning the needles clockwise leans the fuel mixture reduces fuel flow and turning the needles counter clockwise richens the fuel mixture increases fuel flow just like a shower tap Settings will vary with altitude temperature humidity fuel carburetor variances etc but a safe starting point would be to close both needles carefully Don t tighten a needle hard it will damage the seat then open 11 2 turns on the L needle and 1 turns on the H needle There is an interaction between the H and L needles so they must be set in sympathy with each other In brief after the engine has warmed up and you are sure it is secure run the motor at full throttle and listen the engine should be burbling running rich If not open the H needle slowly until the revs drop off rich Then slowly screw in clockwise the needle and listen as the engine runs progressively faster and smoother At some point it will be nice and smooth and really pumping then start to sag lean you have just gone through peak Stop immediately and open
9. rill press using the prop washer as a guide Drill from the back of the propeller to ensure that the exit holes are perfectly in line with the associated holes in the prop hub Bear in mind that multi bolt hubs have a central shaft for accurate propeller location the mounting bolts are there to keep the prop on the engine and transfer torque If the prop does not track replace it or attempt to reshape the seat area do not crush the prop in an effort to correct the tracking by inconsistent torque on the bolts Starting Only after carefully checking over your airplane and engine including the recommended range check for your equipment then fuel up An informed helper is always a good idea From cold first start of the day e Close the choke and open the throttle approx 50 e Turn the ignition module on and start flipping the propeller This will only consume a minute or so of battery but it will prevent flooding the motor Flip the motor until it barks or even runs for a few seconds e Open the choke set the throttle to a fast idle and flip the motor until it starts If it is a cold day and or the motor has not run for a while it may be necessary to repeat the above two steps Let the engine warm up for 30 seconds or so before advancing the throttle Subsequent starts on the day generally do not need any choking Be alert to flooding if the engines becomes stubborn and will not bark or run it may be flooded Shut
10. rned off when priming choking changing propellers or storing Warranty The true spirit of the JC Engines warranty endeavours to fairly resolve any matters that impact on the proper operation or performance of the engine and ignition system as may result from defective materials or workmanship from the manufacturer This intent may be compromised by the very nature of the application of model airplane engines whereby various forms of harm are possible that are not related to defective workmanship and or materials on the part of the manufacturer This would include crash damage incorrect fuel lubricant or mix ratio incorrect mixture settings incorrect propeller selection inadequate cooling incorrect voltages for the ignition etc Disassembly and or modifications to the engine or ignition system will void the warranty The warranty does not cover damage resulting from a mishap or damage caused by incorrect operation of the product in terms of the operating instructions or shipping costs associated with any warranty service Mounting the Engine Whereas the threads in the engine stand offs and prop driver are perfectly adequate for the purpose they are easily damaged by excessive tightening or by cross threading Take care when starting the bolts to ensure that they engage the threads properly and make use of a suitable thread lock rather than applying excessive torque LOCTITE 242 Blue or an equivalent thread lock is preferred
11. s or other damage e Does fuel move toward the carburetor when the prop is flipped with the choke closed If not is the choke butterfly closing completely Is the carburetor or carburetor mount loose causing an air leak e Is the throttle set at idle or slightly higher after engine barks and choke is opened
12. the H needle until the engine passes over peak and just starts to fall off rich again Leave the H needle for now With the engine at its slowest reliable idle open the throttle briskly The engine should throttle up nicely if so start leaning clockwise the L needle 1 8 turn at a time until the engine hesitates stumbles when opened The L needle is now too lean open it anti clockwise 1 8 turn and try again until the engine throttles up smartly without stumbling Each time the L needle is closed a bit the engine will idle faster bring it back down with the mechanical idle stop Now go back to full taps for few seconds and reset the H needle for just on peak then back to the L needle for a steady idle Set the mechanical idle stop for a reliable idle 1 500 1 700 rpm Listen to the engine during flight if it appears to sag off during full throttle flight maybe in a climb land without delay and richen anti clockwise the H needle1 8 turn If the engine burbles a bit in the mid range the L needle may need to be closed a bit Check again that the engine does not stumble when throttled up smartly lean on the L needle Trouble Shooting Motor won t start e Flooding Over choking can cause flooding Clear as above e Low ignition battery voltage check battery voltage should be at least 5 0 volts as well as all ignition connections wiring and switches e Check fuel flow and look for kinks pin hole
Download Pdf Manuals
Related Search