If you want to go straight to the action, skip to around 2:20. - Uses 22/38 tooth planet gears, a 24 tooth sun gear and an 84 tooth ring gear. Attach air lines and your race ready. As with all Lenco transmissions the ST1200 is a planetary design and comes with up to 6 forward speeds. Each sun and planet gearset provides two speeds. Reverse is handled by a reverser section that is attached to the rear of the transmission. 1.280% Uses 27 tooth planet gears, a 21 tooth sun gear and a 75 tooth ring gear. 1.22%Uses 38 tooth planet gears, a 22 tooth sun gear and a 98 tooth ring gear. The LENCO gear reduction unit - with a range of 31% to 56%-helps get you off the starting line. e30 m52 turbo. I do have three .080" shims, two .017" and six .027" shims. When the transmission is shifted a clutch pack compresses the rotating sun gear assembly to the direct drive central sun gear. On the street five-speed model the ratios start at 3.25 in first gear, 2.26 in second, 1.64 in third, 1.25 in fourth, and fifth gear is 1:1. Rotate air servo into case until you see the set screw in the air servo piston boss inside the case. To select any gear (ie 1st gear) the other two levers (3/4th & reverse) must be in the neutral (center) position. The Lenco Racing Lencodrive is the automatic answer for people who prefer torque converter/automatic transmission applications. 1.41%Uses 23 tooth planet gears, a 32 tooth sun gear and an 79 tooth ring gear. Since the taller ring and pinion have more tooth area contact they are more reliable and less prone to breakage. Lenco revamped the ST1200, by replacing sand molds with CNC 5 and 6-axis milling machines. All Rights Reserved. His dial-in time is 10.60 and his ET for this race was a 10.61.
We offer Turbo 400, C6, Mega and standard Powerglide size input shafts per your requirements. A BorgWarner T56 six-speed transmission was used in the Viper; automatics have never been available. The rear case a 1.31 ratio gearset. 1.21% Uses 21/31 tooth planet gears, a 24 tooth sun gear and a 76 tooth ring gear. All transmissions are the sum of their parts. The shift lever is almost the same height as the standard 5th gear lever. Run the air servo jam nut and o-ring up the threads on the servo. Think of it as manually shifting an automatic transmission. If you have a car that you drive to the store on Monday and to the drag strip on Sunday, the only hard question that you have to ask yourself is: Do you prefer anodized or clear? The original transmission was and is still a bulletproof transmission for the street/strip crowd. Each planetary gear set is in its own housing and carries a higher ratio. Then, continue to screw air servo Out (counter-clockwise) one half turn. If a sun gear to ring gear has a ratio of 1.44, then the intermediate shaft that is attached to the planetary carrier is spinning at a 1.44 reduction in relation to the input shaft. 1.20%Uses 22/32 tooth planet gears, a 22 tooth sun gear and a 76 tooth ring gear. What kind of clutch you run is a big factor. Rotate air servo into case until you see the set screw in the air servo piston boss inside the case. Copyright 2020, Lenco Racing. Since each case contains one gearset and provides both underdrive and direct drive,multiple cases (gearsets) provide multiple underdrive ratios. This is a 1971-72 901 transmission converted for use as a side shift 914 gearbox. The middle case would also contain a 1.37 planet gear set. Typically the CS-1 and CS-3 run the 2.50" piston air servo (150 psi) and the CS-2 and Lenco drive runs the 3.00" piston (250 psi). Planetary transmissions rely on a central sun gear to provide a 1:1 direct drive ratio once shifted from the launch ratio. Final drive ratio is 1:1. If needed you may vary 1 full turn up or down from your 2 turns out in order to achieve the shift pressure desired.
lenco air shift options | InsideTopAlcohol The sun gear only rotates when it is locked with the ring gear. A large sprag clutch is attached on to the sun gear of the planetary carrier finishing the transmission section. The ST1200 transmission is pure Lenco through and through and is ideally suited for nitrous, blown, injected and carbureted engines producing up to 1200 HP and 900 lb ft of torque. Once installed, make sure the air servo is loose and can turn freely.
EASY SHIFTING with David Sumek | David answers a few FAQ on - Facebook Warning: Do Not over tighten set screw. 3 Speed + reverser with Pro output: 25.000". The original ST1200 came with a cast aluminum case, gasket seals, and a range of selectable gear ratios. The planetary carrier that is holding the sun gear and planetary gears and clutch pack is placed inside the ring gear. Lenco, the all time champion and undisputed leader in the drag racing transmissions. Hurst's inspiration for the Lightning Rods was the Lenco transmission (above) used in drag racing in those years, notably in the NHRA Pro Stock category. 1.28% - Uses 32 tooth planet gears, a 25 tooth sun gear and a 89 tooth ring gear. All transmissions work by using gear ratios to transfer power to the rear wheels.
Lenco Shift Pressure | InsideTopAlcohol Smaller diameter and shorter length make this transmission a practical choice for use in restricted confines and instances when you have limited distance from the engine to the rear end. Our most common style clutch disc is the green disc and it comes in two sizes depending on which style transmission you are working on. up to the CO2 configuration or vice versa. Each case in succession, with its particular underdrive ratio, determines the immediate drive ratio. Lenco, the all time champion and undisputed leader in the drag racing transmissions. A perfect replacement for expensive breakage prone Powerglides, Turbos, C4, C6 style and Torqueflite transmissions the Lencodrive is 100% Lenco. The LENCO ST1200 is the answer for Pro Street and street/strip applications. It is not necessary for the driver to disengage the clutch when shifting from ratio to ratio since all shifting is done with the engines clutch fully engaged.
Lenco Street Transmissions - Super Chevy Magazine - MotorTrend - Uses 24/28 tooth planet gears, a 23 tooth sun gear and a 78 tooth ring gear.
Lenco CS1 Assembly Help | Yellow Bullet Forums Technical Support - Lenco Racing Transmissions A five speed requires four cases, and a six speed requires five cases. When the installed lever is loose that section is in low and when the lever is tight the sections in high. LENCO racing transmission is a smaller, lighter and more compact version of our CS1 Standard Design. The only exception is replacing the pressure plate and resurfacing the flywheel after a long period of use, and frequently changing the transmission fluid about every 400-500 miles. The middle case would also contain a 1.37 planet gear set. The internal action of a LENCO is such that when the transmission is in first gear the chosen planet gear assembly provides the launch ratio. It's capacity is much stronger than the small sprag. After inserting arm into the air servo piston boss, run set screw in until you can no longer remove the arm from the piston boss. of the adjustable shift tower plunger. This information leads to a selection of sun gears with associating ratios, ring gears, and properly sized planet gears that mate the sun gears to their ring gears. 3 Speed with single brg and std output: 23.375". 1.22%Uses 21/30 tooth planet gears, a 24 tooth sun gear and a 75 tooth ring gear. Magnesium Case. The next lever is used for fourth gear and final lever for fifth. 1.19% Uses 21/33 tooth planet gears, a 22 tooth sun gear and a 76 tooth ring gear. 1.479% Uses 19 tooth planet gears, a 35 tooth sun gear and an 73 tooth ring gear. Competition Eliminator, Super classes, Top Dragster and Pro Stock cars are typical classes where you will find the New Generation LENCO. 150 is the usual middle starting point. This L.. Lenco Clutch Disk Alignment Tools areavailable in black anodized billetaluminum. - Uses 28/38 tooth planet gears, a 23 tooth sun gear and a 91 tooth ring gear. 300M Input/Cluster Shafts.
The only difference is that in an automatic, the transmission fluid moves internal valves to close the clutch pack. Its used to force the gear set to make it's ratio by preventing the sun gear from rotating in one direction. It is also 2-lbs lighter for lower rotational mass which translates to quicker acceleration. Multiply all three gearset ratios to determine the first gear ratio of 2.46:1.
Mountains Garage: How To Shift A Lenco Racing Transmission The rear case a 1.31 ratio gearset. 1.38%Uses 23 tooth planet gears, a 28 tooth sun gear and a 74 tooth ring gear. When other gears are selected the synchronizer is placed back in the center of the gear and another synchronizer is activated, repeating the same sliding, matching, and locking maneuver to another set of drive gears. For example, a three speed requires two cases, a four-speed requires three cases, a five-speed requires four cases and a six-speed requires five cases. All Rights Reserved. For more specific information on any of these Lenco transmissions please refer to the Tabs below, or call our tech line at(909) 673-9080. 1.297% Uses 26 tooth planet gears, a 22 tooth sun gear and a 74 tooth ring gear. With its modular design, an infinite number of speeds can be added. the sun gear from rotating in one direction. Exclusively V.A.R. at a lesser price than our full race units. This L.. Purchase the complete LENCO bell housing assembly or individual bellhousing components as needed. Shift with either our patented multi lever system or with the . As with the CS1 Standard Design, the New Generation CS2, CS3 and CS4 can be shifted by lever or our CO2 system. 3. Input shaft. All LENCO transmissions can be shifted with levers or a CO2 system. 1.378%Uses 23 tooth planet gears, a 28 tooth sun gear and a 74 tooth ring gear. The sun gear is the center of the mechanism's universe. The next lever is used for fourth gear and final lever for fifth. Screw the servo into the transmission case until contact is made with the shift fork pin. The ring gear is then pressed inside of the bearing. Then start the tires spinning, now shift the front section so that you are now in high gear. 1.44% - Uses 20 tooth planet gears, a 32 tooth sun gear and a 73 tooth ring gear. 1.21%Uses 21/31 tooth planet gears, a 24 tooth sun gear and a 76 tooth ring gear. Please click here for CS3 Timing Chart (.pdf). This clearance should be between .080"-.120" and can be adjusted by adding or subtracting floaters . 1.23% Uses 21/30 tooth planet gears, a 25 tooth sun gear and a 76 tooth ring gear. Available in single o.. Lenco couplers are machined from 8620 aircraft quality steel and heat treated for for severe duty se.. 1.56% - Uses 16 tooth planet gears, a 41 tooth sun gear and a 73 tooth ring gear. Lenco transmissions were first made popular in the early '70s when NHRA Pro Stockers needed a gearbox that was up to the task of 9-second elapsed times. The Lencodrive is the shortest and lightest torque converter driven transmission available anywhere. This intermediate shaft connects this planetary gear set to subsequent planetary gear sets which make up the modular nature of this transmission. The CS-2 is much easier to work on than the CS-1. Smaller diameter and shorter length make this transmission a practical choice for use in restricted confines and instances when you have limited distance from the engine to the rear end. If you already have a ST1200, you can upgrade your transmission with the new parts, ratios, and even new casing as all of the new upgraded components are compatible with the older units. There are a variety of both manual and CO2 servo tower designs.
ln general, all Lenco transmissions are a planetary design. There are two different size air servos for the New Generation transmissions.The small air servo (2.5"piston diameter) and the large air servo(3"piston diameter) for the CS-2 large case transmission and Lencodrives. Screw the servo into the transmission case until contact is made with the shift fork pin. In the example of a four speed, the case nearest the engine would contain a 1.37 ratioplanet gear set. We found the small Sprags service life growing shorter and shorter, so we have discontinued it and highly recommend upgrading to our large Sprag assembly. The first speed is when the ring gear is rotating while the sun gear is stationary. There are a variety of both manual and CO2 servo tower designs. First you always start with at least one floater and then a clutch disc and repeat ending up with at least one floater.
In-Car Shot Drag Racing Lenco Transmission Video - YouTube The three speed is approximately 135 lbs. All ST1200 Street units now come with low drag bearings and a billet case. Add fluids as necessary and install fill plug. The downside of this setup is that the shafts are only supported on their ends, so the shaft can bend with torque. All Rights Reserved. Lenco celebrates over forty-five years of the engineering and manufacturing of the most successful drag racing transmissions ever built. Lencodrive 2 Speed. custom vertical gate shifter, push button downshifting. When doing burnout's you need to roll up to the water box then shift all sections accept the front section. Lenco celebrates over forty-five years of the engineering and manufacturing of the most successful drag racing transmissions ever built. 1.50% Uses 22 tooth planet gears, a 44 tooth sun gear and an 88 tooth ring gear. contain a 1.37 ratio planet gear set. All three units shifted equal final drive ratio of 1:1. Screw air servo into case until it bottoms out against the jam nut.
Lenco Transmission Overview First gear is the furthest lever from the driver with higher gears being the nearest levers. The result is LENCO quality and durability at a reasonable "Street Machine" price. This pressure adjustability gives you considerable control when
1.438% Uses 20 tooth planet gears, a 32 tooth sun gear and a 73 tooth ring gear. Adding progressively different ratio independent gear housings behind each other allows Lenco to create two-speed, four-speed, five-speed, and even six-speed transmissions. Since each case contains one gearset and provides both underdrive and direct drive,multiple cases (gearsets) provide multiple underdrive ratios. CS2, CS3, CS4 & Lencodrive or offset shift transmissions: Sight through plug hole, where you will see the outer edge of the rotary shift plate. 1.17% (1.165) - Uses 22/38 tooth planet gears, a 24 tooth sun gear and an 84 tooth ring gear. all hardware. Lencodrive 3 Speed. 1.280%Uses 27 tooth planet gears, a 21 tooth sun gear and a 75 tooth ring gear.
Lencodrive 3 Speed and Reverse | Lenco All Rights Reserved. Chevy Pilot Bearing Assembly 1955-2000 Chevrolet (SB & BB), and Lenco transmissions. specific design will suit you best. Traditional manual transmissions consist of at least two linear shafts: an inline input and output shaft, and a counter shaft. For example, a three speed requires two cases. Lenco Transmissions Tech. The truck runs a big-block Chevy that makes 1,100 horsepower on pump gas and lots of nitrous oxide. Multiply all three gearset ratios to determine the first gear ratio of 2.46:1. 1.29, 1.35, and 1.41 gear ratios have been added making a larger list of eight selectable gear ratios. Planetary transmissions rely on a central sun gear to provide a 1:1 direct drive ratio once shifted from the launch ratio. The Lencodrive will accept virtually any manufacturer's torque converter. Shift Patterns: 1.22%Uses 21/30 tooth planet gears, a 24 tooth sun gear and a 75 tooth ring gear. 1. In general, all LENCO transmissions are a planetary design. Refining the machining process of how the gears are made and even designed resulted in more efficient gears that mesh together easier than the previous version. You may choose any conventional input shaft spline. Reverse Lockout. It is not necessary for the driver to disengage the clutch when shifting from ratio to ratio since all shifting is done with the engines clutch fully engaged. 1.500%Uses 19 tooth planet gears, a 38 tooth sun gear and a 76 tooth ring gear. The choice is yours. ST1200 Street Strip
Uses 225mm clutch pack in a reverse. Polishing the shift fork helps a lot for consistent shifts. When this occurs, the ring gear becomes the dominant gear1:1 (final drive ratio). 1.24% Uses 26/31 tooth planet gears, a 23 tooth sun gear and an 80 tooth ring gear. 1.73% Uses 14 tooth planet gears, a 76 tooth sun gear and a 104 tooth ring gear. This is what comes standard in most new LENCO transmissions. The CS2 ,CS3, and CS4 LENCO racing transmission is a smaller, lighter and more compact version of our CS1 Standard Design. Multiply the two rear case gearset ratios to determine the second gear ratio of 1.80:1. The planet gears are driven by an encompassing ring gear. To add more speeds to a planetary transmission you add more sections. There must be a minimum of .060" to a maximum of .090" of clearance between face of pilot bearing to beginning of clutch spline. 1.25%(Small shaft gearset) Uses 32 tooth planet gears, a 22 tooth sun gear and a 86 tooth ring gear. All Rights Reserved. It uses a clutch and flywheel assembly only to engage the transmission into first and reverse gears. With a simple shift pressure adjustment you can easily compensate. If you want to go straight to the action, skip to around 2:20. Please call for ordering or technical information. The Lencodrive comes as a 2 speed with reverse. All transmissions, once assembled, have to be installed in a car. Thus a 1:1 ratio is achieved. 1.41% Uses 23 tooth planet gears, a 32 tooth sun gear and a 79 tooth ring gear. View the whole process and start at the beginning. Section upon section are bolted together until the transmission takes shape, growing taller than the technician building it. A perfect replacement for expensive breakage prone Powerglides, Turbos, C4, C6 style and Torqueflite transmissions the Lencodriveis 100% Lenco. 1.19%Uses 21/33 tooth planet gears, a 22 tooth sun gear and a 76 tooth ring gear. Each sun and planet gearset provides two speeds. 1.37% - Uses 26 tooth planet gears, a 31 tooth sun gear and a 83 tooth ring gear. 1.50%Uses 22 tooth planet gears, a 44 tooth sun gear and an 88 tooth ring gear. Engineered to handle 3500+ HP the Standard Design LENCO is available with up to 5 speeds and comes in a cast magnesium case. 5.6K views, 84 likes, 1 loves, 13 comments, 17 shares, Facebook Watch Videos from Lenco Racing Transmissions, Inc.: David answers a few FAQ on CS-1 thru CS-4 Transmissions Available in either bare aluminum (clear) or hard anodized black finish, you can choose the transmission finish that best suits your style; however, Lenco highly recommends the standard hard anodized black finish as transmissions usually live a hard life underneath a car where no one can see it, and where it is subject to lots of splashing and hits from rocks and other road debris. The Lenco is basically a planetary transmission where each gear has its own housing and its own shift lever. This change reduced any chance of casting imperfections and it offered more control over the final product. Operation of a Lenco is fairly straight-forward: When it's time to shift gears, simply pull the appropriate lever, with each gear having its own stick. Th.. The version 2 of the ST1200 transmission, builds upon that great design with an all-aluminum billet CNC casing, double O-ring seals, hardened anodized finish, and a larger choice of gear ratios for perfect fine tuning of gear ratios. All levers in forward position result in the transmission being in first gear. racing transmission, The CS2 ,CS3, and CS4
You can expand to 3 or 4 speeds by addition of additional cases.