Cs1-n

Anyone ever run one of these? How is the durability of the compound gearset? Are all the parts the same in the reverser (shafts, planet assembly, ring gear, slider,etc) as the regular CS1? How much heavier is it? Information seems to be few and far between other than the fact that the case is a tad bit larger. Thanks in advance.

 

Isen't bigger always better?

 

Years ago I bought a CS1N 4 speed of all things at a swap meet. I knew nothing about Lenco's at the time. I took the trans to Matt at lenco and soon found out I had bought the wrong trans for my application.

These units use two 1 inch planetary sets in compound to get their ratio's. As I remember that was the only way to get a ratio under 1.25-1 at the time. These units are bullet proof as they were made to handle blown fuel applications and were used in many fuel cars, just before everyone went to clutch only cars.

The reverser as far as I remember had a different case but took most of the internal parts of the standard reverser, as I recall there might have been one part that was different. Sorry but it has been many years since I went through this.

Hope this helps,

Tom

 

Mike all of the cs1-n's have the compound gearsets, even the 25%. Here is a list of available ratios.
1.17%
1.19%
1.22%
1.25%

Could you educate me a little bit on the CS-2? I know some have big shafts and small shafts, I was told to stay away from the compound gearsets. Are there certain ratios that are stronger than others and some that I should stay away from?

 

All CS-2 gearsets have the big shaft or is that an option?

 

CS1N Lenco

I have a CS1-N 2 speed I wish to sell.
It has a 1.91 ratio with a reverser.
It is course spline in and fine spline out.
Often found behind a Bruno unit.
I posted this in the classified section back in March.
$2500 if interested call Matt @ 585-739-1889

Thanks

 

Do you mean 1.19 ratio?

 

Lenco CS1-N

It is 1.91 ratio for sure.
I have run it for a few years and have had it apart for inspection a couple of times.
They used to have that ratio listed on the Lenco web site.

Matt

 

The CS1N with the 1.91 gear ratio that came behind the bruno units have a TIMED gear set. They held up good in dragsters and altereds but not for heavy, high HP style car's.

 

Mike,
How do you determine what is big/small shaft units,(CS2) and I assume we're talking internal shafts, not input/output. Do you have or know what actual diameters are, or can you tell with spline count? Is there really a big difference in strength? Any help appreciated.

 

The planetaries in the N case are synchronized (for lack of better word) to each other. There is a procedure to lining them up. I have an instruction sheet from Lenco. Its kind of odd deal because you line up the marked sets and then from that point on its all by feel. You rotate the inner gears one gear at a time and one tooth at a time and rotate the sun gear. If it feels worse you move it back if it feels better you move the next one. I might be able to post a picture of the instruction sheet and diagram.

BTW I was always told the CS1N highest ratio available was 25%. I didn't know anything about a 91%. The CS1N was built for High Horsepower Fuel application. The 91% must have some very small gears?

 

This is for the CS-3 but I imagine the principle is the same. Didn't Lenco at one time make an overdrive unit, where 1st gear was 1 to 1? Could this 91% tranny be some kind of hybrid? Just throwing that out there.....feel free to throw it away......

http://www.lencoracing.com/Timing charts CS-3.pdf

 

You can sure feel the differance when its not rite.