Going 5-speed, I think....

[boygenius]

After driving up to Toccoa I am begining to think that my car could really benifit from a 5th gear to aid in acceleration. After talking to a few people it looks like getting a 5th gear is cheaper than getting the extra hp needed to pull the 4-speed. I am going to most likely build a 2270 now after talking to Jake Raby and Len Hoffman. So what would be a good gear box for an engine like that.


1. 1978 to 1983 915 converted to a push type clutch.

2. 923 gearbox from a rare 1976 912E already designed for the type 4.

3. 901 (flipped 914) with 100mm drive flanges.


P.S. I will also have a new kennedy type 4 to type 1 adapter flywheel and built close ratio type 1 tranny with 100mm drive flanges for sale if I decide 100% to go ahead with the tranny swap. If anyone is interested in the above items the possable sale might motivate the swap. Just want to make sure I can sell what I have to pay for what I want.

[kdanie]

Porsche made each transmission with several different gear sets, the only way to tell what gears are really in the box is to disassemble it and count teeth. Not a fun prospect and not likely to happen as you are trying to buy a used trans.

The trans case has a code stamped on the bottom and that number will tell you what gear ratios were originally in the trans. Porsche printed little pocket guides that were great for this info.... Might be hard to find but you could get the number and call/visit a dealer service or parts dept. they should be able to help.

There was even a 901 with a 1-1 5th gear.... great for racing but not for crusing unless you change the final drive too. If you stumble onto one of those grab it, you can sell it and buy at least 2 other "normal" trans...

ken

[boygenius]

Thanks for the reply Kdanie...


Anybody have any opinions here.
What letter codes for the gears would work good for a 2270cc type 4.
I might have a buyer for my tranny so that would pay for the 5 speed....

Should I keep my kennedy type 4 to type 1 flywheel or get a 215 mm 914 flywheel.?

[kdanie]

For an early Porsche 901/902 5 speed you need the 914 flywheel/clutch. For a 915 trans you need a special flywheel/clutch or convert your release bearing to the early style.
ken

[boygenius]

What is the difference between the 901 and the 902 transmission.?

[kdanie]

I have a 902, it's from a '69 912. I think the only difference is the gear ratios, which I think are a little low for the torque of a type 4.

ken