CS2 3 Speed

CS2 3 Speed

Lenco CS2 Transmissions

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.

The Lenco Racing CS2 3 Speed Transmission design is engineered for race cars producing up to 2500 HP. The CS2 is a smaller and lighter version of the CS1. We recommended the CS2 for use when space is at a minimum. The CS2 is available with up to five speeds and 12 first gear ratios. The CS2 planetary gear size is 3/4". The CS2 is ideal for heavier Pro Mod cars, pullers and mud bog machines. All shafts are available in Marage or 300M material.

We offer a variety of lightening procedures for internal rotating mass and suggest you call and discuss your exact application and requirements. All of our transmissions are purpose built and there is no Off the shelf, one size fits all LENCO. As with all LENCO transmissions the CS2 may be shifted with CO2 or manually. Cast magnesium case is standard.

CS2 3 Speed
Two magnesium cases. Handles up to 2500 HP. Widely used in Top Dragster, supercharged alcohol, supercharged gasoline cars and boats. Small size helps solve fit constraints while still giving reliable LENCO strength and repeatability. Air or lever shift.

Reverse Unit
Magnesium case. Mates to CS1, CS2, CS3 or CS4 transmission. 5 1/2" long, manual shift only.

 

Available also in:

CS2 2 Speed
One magnesium case. Handles up to 2500 HP. Suggested for supercharged cars, boats, pullers, mud boggers and nitrous oxide assisted machines where available space is at a minimum and a tight fit a necessity. Air or lever shift .

CS2 4 Speed
Three magnesium cases. Handles up to 2500 HP. Recommended for heavier nitrous oxide or supercharged machines when space is at a premium.  Popular with Pro Mod racers. Air or lever shift.

CS2 5 Speed
Four magnesium cases Handles up to 2500 HP. Recommended for Pro Stock, Comp eliminator, 10.5 tire cars and similar classes. With five forward speeds you can tailor the five ratios to fit your unique power band needs. Especially well suited for narrow rpm range and close tolerance engine/clutch tuning. Air or lever shift.

3/4" Gear Set.
Light weight components.
Light weight ring gears (units w/27 and 32 spline shafts only).
Low drag (angluar contact and needle bearings).
Choice of ratio.
Choice of standard or new generation reverses.
Air servos or max-adjust shift towers.
Input shaft.
Throwout bearing collar (4 & 5-speed only).
Shifters and lockouts can be either style.

CS2 Gears 3/4"

1.16% Uses 21/36 tooth planet gears, a 22 tooth sun gear and a 79 tooth ring gear.
1.19% Uses 21/33 tooth planet gears, a 22 tooth sun gear and a 76 tooth ring gear.
1.20% Uses 22/32 tooth planet gears, a 22 tooth sun gear and a 76 tooth ring gear.
1.21% Uses 21/31 tooth planet gears, a 24 tooth sun gear and a 76 tooth ring gear.
1.22% Uses 21/30 tooth planet gears, a 24 tooth sun gear and a 75 tooth ring gear.
1.23% Uses 21/30 tooth planet gears, a 25 tooth sun gear and a 76 tooth ring gear.
1.24% Uses 26/31 tooth planet gears, a 23 tooth sun gear and an 80 tooth ring gear.
1.20% Uses 40 tooth planet gears, a 21 tooth sun gear and a 102 tooth ring gear.
1.22% Uses 38 tooth planet gears, a 22 tooth sun gear and a 98 tooth ring gear.
1.25% (Small shaft gearset) Uses 32 tooth planet gears, a 22 tooth sun gear and a 86 tooth ring gear.
1.25% (Large shaft gearset) Uses 36 tooth planet gears, a 25 tooth sun gear and a 98 tooth ring gear.
1.28% Uses 32 tooth planet gears, a 25 tooth sun gear and a 89 tooth ring gear. 
1.31% Uses 27 tooth planet gears, a 25 tooth sun gear and a 80 tooth ring gear.
1.35% Uses 26 tooth planet gears, a 28 tooth sun gear and an 80 tooth ring gear.
1.38% Uses 23 tooth planet gears, a 28 tooth sun gear and a 74 tooth ring gear.
1.41% Uses 23 tooth planet gears, a 32 tooth sun gear and an 79 tooth ring gear.
1.44% Uses 22 tooth planet gears, a 35 tooth sun gear and a 79 tooth ring gear.
1.46% Uses 22 tooth planet gears, a 37 tooth sun gear and an 80 tooth ring gear.
1.48% Uses 22 tooth planet gears, a 40 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.
1.56% Uses 22 tooth planet gears, a 55 tooth sun gear and a 98 tooth ring gear.
1.68% Uses 15 tooth planet gears, a 62 tooth sun gear and 91 tooth ring gear.
1.73% Uses 14 tooth planet gears, a 76 tooth sun gear and 104 tooth ring gear.

In general, all LENCO transmissions are a planetary design. Planetary transmissions rely on a central sun gear to provide a 1:1 direct drive ratio once shifted from the launch ratio.


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 provides two speeds. Those two speeds are (1) the lower underdrive ratio and (2) the direct 1:1 final lock-up drive ratio.

 

Each LENCO transmission is thus a two speed and is housed in one dedicated two speed.

We acheive more than two speeds by combining multiple cases.

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.

 

 

Since each case contains one gearset and provides both underdrive and direct drive, multiple cases (gearsets) provide multiple underdrive ratios.

 

You must multiply each cases underdrive ratio in order to determine the first gear ratio.


In the example of a four speed, the case nearest the engine would contain a 1.37 ratio planet gear set. The middle case would also contain a 1.37 planet gear set.
The rear case a 1.31 ratio gearset.

 

 

By multiplying these three ratios you come up with a 2.46 first gear ratio. Second gear ratio is 1.80 and third gear is a 1.31 ratio. Final drive ratio is 1:1.

 

Multiply all three gearset ratios to determine the first gear ratio of 2.46:1. Multiply the two rear case gearset ratios to determine the second gear ratio of 1.80:1. The gearset in the third case alone, 1.31:1, determines the third gear ratio. All three units shifted equal final drive ratio of 1:1.

 

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. The planet gears are driven by an encompassing ring gear.

 

When the transmission is shifted a clutch pack compresses the rotating sun gear assembly to the direct drive central sun gear. Thus a 1:1 ratio is achieved.

 

Each case in succession, with its particular underdrive ratio, determines the immediate drive ratio.

 

Once all cases have been shifted the entire transmission assembly is locked in the final 1:1 direct drive ratio.

 

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.

(909) 673-9080

Please call for ordering or technical information.

  • Views: 3719
  • Brand: Lenco Racing
  • Product Code: CS2-3
  • Availability: In Stock
  • $5,945.00

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Tags: cs2, transmission, racing transmission, 3 speed