The sections are joined by a sprag clutch that restricts rotation of the sun gear to one direction. Planetary transmissions, like Lenco, eliminate this inherent design weakness by utilizing planetary gears. If he shifts slower, the transmission shifts softer; if he shifts faster, the transmission shifts harder. The arm must be free to move in all directions. Air servos or max-adjust shift towers. Lencodrive 4 Speed. Manual 2 Speed with Neutral Safety [DRIVE-2-S], Manual 3 Speed with Neutral Safety [DRIVE-3-S], Manual 4 Speed with Neutral Safety [DRIVE-4-S], Lockout Shift with Neutral Safety [DRIVE-L-S]. If, however, the track is loose from 300 through 500 you can soften ST1200 Street Strip Checking Shift Pressure(only on CS-1 style or center shift transmissions): To measure the shift pressure install checking lever into tower screw jam nut all the way up the tower so it's out of the way. 1.313%Uses 27 tooth planet gears, a 25 tooth sun gear and an 80 tooth ring gear. 1.19% Uses 21/33 tooth planet gears, a 22 tooth sun gear and a 76 tooth ring gear. We recommend that you discuss your application with our technical representatives and follow their suggestions on which 1.25% Uses compound 25 and 29 tooth planet gears, a 25 tooth sun gear and a 76 tooth ring gear. 1.44% ratio uses 22 tooth planet gears, a 35 tooth sun gear and a 79 tooth ring gear. The ST-1200 is not one of their most popular transmissions (they still sell more racing models), but it is the answer to many problems facing high-horsepower street cars and trucks that need a compromise between a stout race and street transmission. lenco cs3 5 speed. 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. All Rights Reserved. Section upon section are bolted together until the transmission takes shape, growing taller than the technician building it. The LENCO gear reduction unit - with a range of 31% to 56%-helps get you off the starting line. I shift it with a timed switch getting its signal from an electric shifter box so that it applies voltage for 17 sec at the shift. Screw air servo counter-clockwise about five or six turns before you reassemble the transmission. When you add the fact that this car is a manual, it really makes this drag racing video a rare one to enjoy. The only difference is that in an automatic, the transmission fluid moves internal valves to close the clutch pack. Warning: Do Not over tighten set screw. Assemble next section on to case and bolt tight. Gear ratios are selected using a mathematical calculation that considers both the number of speeds required, horsepower of the car, and final rearend drive ratio. 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. 1.35% Uses 26 tooth planet gears, a 28 tooth sun gear and a 80 tooth ring gear. - Uses 28/38 tooth planet gears, a 23 tooth sun gear and a 91 tooth ring gear. Once engaged, the gears are shifted without a clutch. The sun gear only rotates when it is locked with the ring gear. Additionally, the Lencodrive's main valve body is machined from billet components and is not the typically modified OEM Detroit component. 1.368%Uses 21 tooth planet gears, a 25 tooth sun gear and an 74 tooth ring gear. Building a Lenco ST1200 starts with constructing the soul of the transmission: assembling its planetary gear sets. Lenco, the all time champion and undisputed leader in the drag racing transmissions. The biggest benefit to Pro Streeters is that you don't have to worry about overheating, flashing the torque converter or other maintenance costs-as there are none. The gearset in the third case alone, 1.31:1, determines the third gear ratio. 1.50% Uses 22 tooth planet gears, a 44 tooth sun gear and an 88 tooth ring gear. You always need to come out of the water box in high gear to prolong the life of the transmission. Input shaft. Then start the tires spinning, now shift the front section so that you are now in high gear. Upshifting is very commonly done this way, but you can also do it while downshifting. In the example of a four-speed, the case nearest the engine would contain a 1.37 ratio planet gear set. 1.25% Uses compound 25 and 29 tooth planet gears, a 25 tooth sun gear and a 76 tooth ring gear. 1 position forward selects 1st gear, then 2nd gear is selected by . The Lencodrive's trans-brake is controlled by an electric solenoid which activates hydraulic compression of a dedicated clutch pack. This intermediate shaft connects this planetary gear set to subsequent planetary gear sets which make up the modular nature of this transmission. It's capacity is much stronger than the small sprag. 1.50% - Uses 17 tooth planet gears, a 34 tooth sun gear and a 68 tooth ring gear. 1.338%Uses 24 tooth planet gears, a 25 tooth sun gear and a 74 tooth ring gear. The Sprag clutch is utilized in each shiftable section of the LENCO with the exception of the reverse. Purpose designed and produced for drag, ski and river boat requirements. The Lencodrive will accept virtually any manufacturer's torque converter. the sun gear from rotating in one direction. Since each case contains one gearset and provides both underdrive and direct drive, multiple cases provide multiple underdrive ratios. Apply a small amount of Red (271) Locktite on the set screw. For example, a three speed requires two cases. Race prepped Hydramatic. 1.566% Uses 18 tooth planet gears, a 45 tooth sun gear and an 81 tooth ring gear. The planetary carrier that is holding the sun gear and planetary gears and clutch pack is placed inside the ring gear. 1.73%Uses 14 tooth planet gears, a 76 tooth sun gear and 104 tooth ring gear. The Lenco Racing Lencodrive is the automatic answer for people who prefer torque converter/automatic transmission applications. Air servos are machined from billet alum. Aside from manufacturing benefits, it also gives customers a finished piece that looks more like jewelry than an automotive part. Run air servo jam nut and o-ring down against the case and tighten with a 1 1/2" wrench. 1.68% Uses 15 tooth planet gears, a 62 tooth sun gear and a 91 tooth ring gear. When the transmission is shifted a clutch pack compresses the rotating sun gear assembly to the direct drive central sun gear. Each LENCO transmission is thus a two speed and is housed in one dedicated two speed. The Lenco Racing Lencodrive 3Speed Automatic Transmission represents our response to people wh.. Reverse is a small black lever. The internal action of a LENCO is such that when the transmission is in first gear the dedicated planet gear assembly provides the launch ratio. Second gear ratio is 1.80 and third gear is a 1.31 ratio. All levers in forward position result in the transmission being in first gear. Call our technical department at (909) 673-9080 or email us here with any questions you may have concerning function or applications. The arm is held into the servo piston by a set screw. When this occurs, the ring gear becomes the dominant gear1:1 (final drive ratio). Run the air servo jam nut and o-ring up the threads on the servo. The original ST1200 came with a cast aluminum case, gasket seals, and a range of selectable gear ratios. Now rotate tower clockwise until it lightly touches pin on shift fork then rotate tower counter clockwise 2 turns and place hook of scale in top hole of checking lever supplied with transmission (this lever should be about 5 1/2" over all length) and pull scale slowly to shift section, taking note of highest reading this is your shift pressure. The CS1 planetary gear size is 1". Multiple speed transmissions use multiplication of gears to create different speeds. Stay up to date with news and promotions by signing up for our monthlly newsletter. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright . Screw air servo in (clockwise) until you see the rotary plate start to shift, now screw air servo Out (counter-clockwise) until the rotary shift plate stops moving. 1.68% Uses 15 tooth planet gears, a 62 tooth sun gear and a 91 tooth ring gear. The first gear set is multiplied by the next, which is multiplied by any subsequent gears sets to eventually reach the final drive ratio of 1:1 where the output shaft is spinning as fast as the input shaft (or overdrive which is any ratio lower than 1 like .85:1). Please call for ordering or technical information. The 4-speed above shows how to determine drive ratios. With its modular design, an infinite number of speeds can be added. Second gear ratio is 1.80 and third gear is a 1.31 ratio. Tags: 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. Clutchless shifting is the practice of changing or shifting your gear without touching the left bar lever. First gear is the furthest lever from the driver with higher gears being the nearest levers. This gadget employed three shift levers to accomplish everything that a single lever could do. In order to achieve an underdrive first gear launch ratio the LENCO transmission relys on planet gears which rotate around the sun gear. Each sun and planet gearset represents two speeds. 1.19%Uses 21/33 tooth planet gears, a 22 tooth sun gear and a 76 tooth ring gear. LENCO transmissions are shipped with the shift levers removed in order to prevent damage during shipping. Shift Patterns: The power is passed straight through from one planetary gear set into the next gear set and the process repeats again. The air servo is attached to a rotary shift plate by an adjustable arm which is pre-set by the factory and should NOT be changed. The Lenco Racinggear reduction unit, when used in conjunction with our CS1, CS2, CS3, or CS4 t.. Lenco Racingmachines our input shafts from 300M and Marage stock. Planetary transmissions rely on a central sun gear to provide a 1:1 direct drive ratio once shifted from the launch ratio. Air servo or max-adjust shift tower and lever. The second lever, and second tallest, is used for third gear. No further adjustments are necessary as there is ample reserve travel in the servo. the final shift, being locked to a 1:1 ratio. The Lenco Racing Lencodrive 2 Speed Automatic Transmission represents our response to people who hav.. It might be less, it might be much more. Most popular with Sand Dragsters, Mud racers and Modified pullers. CS2, CS3, CS4 & Lencodrive or offset shift transmissions: By multiplying these three ratios you come up with a 2.46 first gear ratio. Planetary transmissions rely on a central sun gear to provide a 1:1 direct drive ratio once shifted from the launch ratio. 1.31% Uses 27 tooth planet gears, a 25 tooth sun gear and an 80 tooth ring gear. A large sprag clutch is attached on to the sun gear of the planetary carrier finishing the transmission section. The ST1200 also utilizes aircraft quality bearings where the pure-race CS2 uses aerospace spec components. The arm must be free to move in all directions. 1.44% - Uses 20 tooth planet gears, a 32 tooth sun gear and a 73 tooth ring gear. This is our double large sprag assembly and is used primarily in the boat applications, but has found its way into some car applications. 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. Any new EXTREME transmission is available set up for a Torque Converter Drive Unit at no extra charge. In the example of a four speed, the case nearest the engine would contain a 1.37 ratioplanet gear set. Large Strips and Clips Sprag Assembly - Thisis a specialized sprag and is used in applications where tire shake is a constant problem. The Lencodrive is the shortest and lightest torque converter driven transmission available anywhere. 1.38% ratio uses 23 tooth planet gears, a 28 tooth sun gear and a 74 ytooth ring gear. 4 speed. 1.50% Uses 22 tooth planet gears, a 44 tooth sun gear and an 88 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. (2) it is easier to work on the bruno/lenco . There are a variety of both manual and CO2 servo tower designs. A perfect replacement for expensive breakage prone Powerglides, Turbos, C4, C6 style and Torqueflite transmissions the Lencodriveis 100% Lenco. Each sun and planet gearset provides two speeds. Lenco, the all time champion and undisputed leader in the drag racing transmissions. Each gear is engaged by pulling down on the shift lever, to activate the clutch mechanism for each gear set. Air servos are specific to the type of Lenco you run so be sure to pick the correct one from the drop down menu. Copyright 2020, Lenco Racing. Lenco, the all time champion and undisputed leader in the drag racing transmissions. Porsche 911-06 side shift transmission for 914 4 or 6. (1) in the bruno/lenco the fluids are seperate - which gives you options of running different fluid types and no chance of breaking the lenco side and mixing it into the converter. 1.31% - Uses 27 tooth planet gears, a 25 tooth sun gear and a 80 tooth ring gear. lntroduced in 1972 as a 2-speed the Standard Design LENCO is our largest and strongest transmission. Chevy Pilot Bearing Assembly 1955-2000 Chevrolet (SB & BB), and Lenco transmissions. The planet gears are driven by an encompassing ring gear. The gearset in the third case alone, 1.31:1, determines the third gear ratio. Apply a small amount of Red (271) Locktite on the set screw. Lenco Drag race car. Once installed, make sure the air servo is loose and can turn freely. If it is necessary to remove the servos you should reinstall with the lock nut spun completely to the top of its travel. 1.405%Uses 23 tooth planet gears, a 32 tooth sun gear and an 79 tooth ring gear. All Rights Reserved. LENCO racing transmission is a smaller, lighter and more compact version of our CS1 Standard Design. 8620 is a premium quality material that will provide excellent service for 1200 HP hot rods. Now rotate counter clockwise 1/2 to 1 turn and tighten lock nut. You will need to add a LENCO reverse unit in order to back up. Remove fill plug on top the transmission case you are going to adjust. Large Sprag Assembly -This is our large sprag and unlike the small sprag doesn't have a snap ring in the outer race and has two brass thrust washers. I do have three .080" shims, two .017" and six .027" shims. 1.16% Uses 21/36 tooth planet gears, a 22 tooth sun gear and a 79 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.
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