Owners manual
Contents
1. and it makes the shock absorber last longer Compression flow Rebound flow Piston with apertures The main piston fig B is specially developed for oval track racing Thanks to the shape of the apertures in the piston the damping force builds up rapidly The result is excellent short stroke high force performance The internal pressure is balanced to cope with tempera ture build up and to prevent any chance of cavitaion yet reducing the fluid compressibility and the friction from the pistons and the shaft seal The new Ohlins shock absorbers are built to perform and endure They are easy to set up and to sort out Thanks to the design of the main body they are also easy to maintain and to rebuild All Ohlins shock absorbers are built with a desire to win and with precision that ends up in quality a quality you can see and feel Damping profile force vs absolute velocity cc ro R35CL15 R35CL10 R35CL5 4 00 5 00 6 00 7 00 8 00 9 00 10 00 Velocity inch sec How the shock absorbers work Compression damping During a compression stroke path 1 Fig 1 is closed the fluid can flow through paths 2 and 3 The damping forces at a certain compression speed are determined by the flow restrictions in these paths The flow restriction through path 2 is determined by how much the fluid pressure can open the compression shims which are closed shut whenever the pressure is to low or the shock is not moving i2. kit for STJ Complete kit to convert a non adjustable shock to an ad justable model Coil over kit for STJ Contains all the parts needed to convert the shock into a coil over shock Service tools ADVANCED SUSPENSION TECHNOLOGY Ohlins USA Inc 703 C Old Spartanburg Road Hendersonville NC 28792 Tel 828 692 4525 Fax 828 692 0595 www ohlins com Ohlins Authorized USA Dealers AMF Motorsports Inc West Chesterfield NH Tel 603 256 6800 Fax 603 256 8142 Brooks Racing Engines Colorado Springs CO Tel 719 632 5496 Fax 719 632 0183 BSR Products Inc Charlotte NC Tel 704 795 0901 Fax 704 795 7403 Harrison Auto Dynamics Phoenix AZ Tel 602 254 0024 Fax 602 254 5655 Howe Racing Enterprises Beaverton MI Tel 517 435 7080 Fax 517 435 3331 Manufactured by Motorsports Spares International Inc Indianapolis IN Tel 317 241 7500 Fax 317 241 0823 Naake Motorsports Roseville CA Tel 916 771 0109 Fax 916 771 5201 John Page Racing Rock Hill SC Tel 803 366 7535 Fax 803 366 7599 The Shock Shop Portland OR Tel 503 621 0621 Fax 503 621 0622 SHY Racing Suspensions Murfreesboro TN Tel 615 893 0150 Fax 615 896 8430 Ohlins Racing AB Box 722 S 194 27 Upplands Vasby Sweden 07412 01 Teknisk Illustration OM US Stock Car 02 03
3. reservoir for better cooling Double acting damper adjuster Quick response for best handling Optimum consistency on long runs Easy to dial in reshim rebuild and service Professional technical support Base valve Large diameter floating piston Technical information WCJ 58000 Shock absorber model Total stroke in mm Total stroke 171 mm 6 7 in inches 382 mm 22 Total length in inches Total length in mm hlins MCJ series Designed for Late Models Modifieds Sprint and many other cars Lightweight threaded aluminum body Large reservoir for better cooling Double acting damper adjuster Quick response for best handling Optimum consistency on long runs Easy to dial in reshim rebuild and service Professional technical support Base valve Large diameter floating piston Includes coil over kit Total stroke Total length Total stroke ie O w Technical information Adjustable models WCJ 58000 WCJ 68000 A 64 mm B 51 mm 171 mm 560 mm 191 mm 600 mm 2 5 2 0 Adjustable models MCJ 08200 MCJ 08400 MCJ 08600 MCJ 08800 A 64 mm B 55 mm 103 mm 417 mm 139 mm 495 mm 168 mm 557 mm 223 mm 667 mm 2 5 2 2 6 7 22 0 1 5 23 6 4 0 16 4 SLi 195 6 6 aa es 8 8 26 2 Ohlins STJ series Designed for Late Models Modifieds Sprints and many other cars Lightwe
4. that is not approved by the vehicle manufacturer may affect the stability of your vehi cle Ohlins Racing AB cannot be held responsible for any personal injury or damage whatsoever that may occur after fitting the shock absorber Contact an Ohlins dealer or other qualified person for advice hlins Racing AB can not be held responsible for any dam age whatsoever to shock absorber or vehicle or injury to persons if the instructions for fitting and maintenance are not followed exactly Similarly the warranty will become null and void if the instructions are not adhered to WARNING Please study and make certain that you fully understand all the mounting instructions and the owners manuals before handling this shock absorber kit If you have any questions regarding proper installation procedures con tact an Ohlins dealer or other qualified person A WARNING The vehicle service manual must be referred to when in stalling the Ohlins shock absorber NOTE hlins products are subject to continual improvement and development Consequently although these instructions include the most up to date information available at the time of printing there may be minor differences between your suspension and this manual Please consult your Ohlins dealer if you have any questions with regard to the contents of the manual Key features Ohlins WCU series Designed for Winston Cup Busch GN and ARCA Lightweight aluminum body Large
5. Owners manual WCJ MCJ STJ LMJ Ohlins shock absorbers a ll i his ee Including Design Technical info Ohlins Racing AB All rights reserved Any reprinting or unauthorized use without the written permission of Ohlins Racing AB is prohibited Ohlins shock absorbers WCJ 58000 WCJ 68000 MCJ 08200 MCJ 08400 MCJ 08600 MCJ 08800 STJ 15400 15450 STJ 17500 17550 STJ 19600 19650 STJ 21700 21750 STJ 23800 23850 STJ 25900 25950 LMJ 55000 LMJ 58000 LMJ 68000 Contents ON e tanmsvanentanestauunuuedeventsaiaruiaencmensen Key TO AEC Sa ratacsoaciestadsvsmantaeatimedetpatosndeh iussunentacatnwoett PSI saas E E How the shock absorbers work ccsscesseeseeeeeeeenees OQHUONaA DAS esien EREA ENRERE Service toolS sccccssesssesssesccsesseesseesecseeseassnnsenseeseness Safety signals Important information concerning safety is distin guished in this manual by the following notations Ah The Safety alert symbol means Caution Your safety is involved A WARNING Failure to follow warning instructions could result in severe or fatal injury to anyone working with inspect ing or using the suspension or to bystanders CAUTION Caution indicates that special precautions must be taken to avoid damage to the suspension NOTE This indicates information that is of importance with regard to procedures Before installation A WARNING WARNING Installing a shock absorber
6. amping and use as little re bound damping as possible This usually means that you gain comfort and handling per formance Compression phase Rebound phase Base plate WCJ and MCJ only The hlins WCJ and MCJ shock absorbers features a base plate which allows the damper to work smoother and safer fig 6 This base plate eliminates the cavitation risk without the need of increased gas pressure It consists of a fixed divid ing wall with apertures and with shims on both sides In the center there is a jet that is available in different sizes The stiffer the compression valving on the main piston the more restrictive the hole in the base plate jet The fluid that flows through the base plate is the volume of the shaft displacement which also moves the floating pis ton The shims on the compression side eliminate the risk of cavitation and the shims on the rebound side works as a check valve Optional parts Double digressive piston This piston can produce high forces at low speed while maintaining a level slope at high speeds High frequency piston Excellent for traction and grip on flat tracks One way shaft jets Allows the compression bleed valve to be smaller than the rebound bleed valve Parallel compression valve Allows the rebound bleed valve to be smaller than the com pression bleed valve and makes it possible to produce dou ble knee curves not yet available for STJ External adjuster
7. ight threaded aluminum body Large reservoir for better cooling Available as adjustable or non adjustable Quick response for best handling Optimum consistency on long runs Optional coil over kit Owner rebuildable Easy to dial in reshim rebuild and service Professional technical support Ohlins LMJ series The Ohlins LMJ stock car shock absorbers are based on the race proven Ohlins type 46HRC a shock absorber with a large reservoir mounted by a hose H features separate rebound R and compression damping C adjusters The large shock absorber reservoir connected to the shock absorber body by a hose contributes to the improved cooling The reservoir contains the floating piston and the gas that pressurizes the damping fluid e Designed for classes like Late Model Dirt Modified and Sprintcar Lightweight aluminum body Large reservoir for better cooling 2 way adjustable damping Quick response for best handling Optimum consistency on long runs Easy to dial in reshim rebuild and service Professional technical support X o i Total stroke Total length Total length Technical information Adjustable models STJ 15400 STJ 17500 STJ 19600 STJ 21700 STJ 23800 STJ 25900 103 mm 4 0 382 mm 15 0 128 mm 5 0 436 mm 17 2 153mm 6 0 490 mm 19 3 178 mm 7 0 544 mm 21 4 203 mm 8 0 598 mm ZOO 228 mm 9 0 652 mm 25 0 Non adjustable models Non adjus
8. n a compression mode The shim stack s resistance to opening is decided by the quantity thickness and diameters of the shims and are carefully chosen to make each shock give optimum results Path 3 is the main bleed valve the larger the orifice the less fluid flows through path 2 making the main valve com pression forces lower Rebound damping During a rebound stroke path 2 Fig 2 is closed and fluid can pass through paths 1 and 3 Damping forces are deter mined by the flow restriction in these paths The flow restriction trough path 1 is determined by how much the fluid pressure can open the rebound shims which are closed shut whenever the pressure is to low or the shock is not moving in a rebound mode These shims are also carefully chosen to give the best set up Path 3 is the main bleed valve the larger the orifice the less fluid flows through path 1 making the main valve re bound forces lower On adjustable models the size of the orifice can be changed with an adjuster knob External adjustment The external adjuster knob easy to reach on the piston shaft just above the eyelet Fig 3 is connected to the main bleed valve via an aluminum rod that runs inside the piston shaft When the temperature in the shock increases the rod expands keeping the flow through the valve exactly the same at all working temperatures The adjuster moves the needle in the main bleed valve which determines the orifice size of path 3 Fig 1 a
9. nd 3 When the adjuster knob is turned all the way clockwise to the closed position the shock is the most restrictive to re bound movement rebounding at its slowest This position is the starting point for counting out the clicks in an counter clockwise direction to the re commended adjuster position normally 8 25 clicks This adjustment has the greatest effect on the rebound damping but it also has an effect on the compression damp ing at aratio of approximately 10 compression and 90 rebound R MLL 2 KKKKKE ae N lt N x RLL LLLA A SSNS External compression adjuster LMJ only With the second adjustable bleed valve on top of the reser voir you can adjust the compression damping The valve restricts the oil flow to the reservoir but not from it thereby only influencing the compression damping fig 4 The fluid displaced by the piston shaft is forced through the independent compression damping adjuster out into the external reservoir fig 4 flow 3 The floating piston in the reservoir is forced to move com pressing the gas behind it further When the shock absorber extends the pressure behind the floating piston will force the fluid through a one way valve and back into the shock absorber body fig 5 flow 1 and 2 Also fluid displaced by the piston shaft can not be forced fast enough through just the valve in the reservoir The pres sure inc
10. reases and a shim stack parallel to the valve opens fig 4 flow 1 and 2 The floating piston is forced to move compressing the gas When the shock absorber extends the floating piston will force the fluid through the one way valve and back into the shock absorber body fig 5 flow 1 and 2 Making adjustments Suspension settings are dependent on your car s weight your driving style track conditions etc If you are not happy with our recommended settings here are a few guidelines and ground rules on how to make adjustments To make improvements it is important to understand that the function of the shock absorbers and through testing learn how they affect the handling of you car g When making adjustments always start with the Ohlins recommended settings Keep notes make adjustments one at a time and in small steps The adjusters should normally not be adjusted in steps of more than 2 clicks at a time and not outside the usable click range Most settings work best with 5 25 clicks When you think you have made an improvement go back to what you started with and double check to be sure Pay attention to changes in conditions like tires temperatures etc In general compression damping changes should be used to influence the car s stability and response while rebound damping changes should be used to influence comfort and traction When you need more damping force you should mainly try to increase compression d
11. table with the same stroke but 0 2 shorter overall length Non adjustable STJ 15450 STJ 17550 STJ 19650 STJ 21750 STJ 23850 STJ 25950 A 64 mm B 51 mm 2 5 2 0 Adjustable models LMJ 55000 LMJ 58000 LMJ 68000 A 64 mm B 51 mm 139 mm 55 434 mm 17 0 179 mm 7 0 502 5mm 19 8 229 mm 9 0 591 5mm 23 3 25 2 0 Gas Dividing p iston Fluid Fluid Main piston Main piston Fluid Fluid Internal dividing External gas reservoir piston with dividing piston Washer Clamp shim Shims Centering shim Ring shim Sealing shim Main piston Piston and shim stack Force pound 400 300 200 100 0 500 700 600 Design The hlins WCJ MCJ STJ and LMJ are all based on hlins successful application of the de Carbon concept that has won more than 60 World Championship titles The de Carbon concept the damping fluid placed under pressure by gas and separated from the gas by a floating piston has several advantages fig A It prevents the risk of cavitation that can wear out internal components and cause inconsistent damping and it eliminates aeration of the damping fluid which also causes inconsistent damp ing It improves the cooling because the fluid is in direct contact with the outer tubing It gives more consistent damp ing regardless of the shock absorber s working tempera ture
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