Will a porsche 901 fit with no mods to a stock type 1 engine?

[GS guy]

Hey Steve,

I have to question your statement about the custom SAW axles - since I was I the same dilemma. I contacted SAW and they said they "would" make custom axles, 28 spline one end and 33 spline the other. Perfect eh? The kicker was the $650 price tag! The full 930 option is also doable, and bolt-on but IMO really overkill and a bit expensive if you have to purchase all new axles/CVs/Boot kits/etc. Also those 930 CVs each weigh about a pound more than T2 CVs! I've found a 3rd route, which was described in an earlier thread but it's time to update. The latest is I'm having Precision Alloy in Washington state custom modify my trans output stubs to take T2 CV joints directly (instead of using adapters). Todd at Precision basically removes the flange portion of the stub then presses and welds on a new chromoly flange (and custom machines to whatever size you want). He does this routinely for many off road racing teams, quality and durability is top notch. I'm sending my 901 (914) stubs this week for the treatment. He does these in batches, so might be a while before he does another set.

FWIW I've got a set of 930 sized 901 output flanges I probably won't need anymore if anyone is interested.

Jeff

[ydeardorff]

I held up my stock type 1 CV boot covers to the output flanges on my spare 911 tranny and the bolt pattern was identical. I am wondering if I can use those flanges on my other 911 tranny (the one I will be putting in). The other 911 tranny has 4 bolt nadella flanges(I was told) I was told they are very saught after.
They dont seem as strong especially with only 4 bolts. Yeah until next year something like the 650 dollar axles are gonna have to wait. If I can get by on stock CV's and Axles for now then I will. But beefing up the durability on the axles and CV's is definately on my to do list. Especially since I'm gonna be running 10" wide rear rims, With 315 50R 15's on them.
I am going for the power and reliability of a rotary, with the strength and durability of the porsche tranny (5 spd).
The idea is to make this kit car of mine everything that a modern car is, but also given it's design,... a little more.

[GS guy]

ydeardorff,
Just remove one of the output flanges from each trans and compare. I did this last night with my spare 901/930 output stubs and 914 stubs - near exact match except for the CV flange - so they definitely directly interchange. One thing that surprised me was the bolt that holds the stub into the trans. It take a fairly large 3/4" size socket, but the bolt itself is fairly small and not super hard to remove out of the trans. I made a simple "wrench" that could be bolted to the CV flange with a couple of bolts to hold it while loosening the bolt.

I don't think there are any strength issues with the 4-bolt flanges, FWIW. The two large dowel pins that locate the CV probably provide more rotational/shear strength and (2) 8mm bolts would.

Jeff

[Steve Arndt]

That is expensive for those dual spline axles! When I asked back in 2001 they wouldn't do it. More people must have inquired since then, or they threw out the 650$ number to scare us away!

That bolt holding the CV flange on is small, but high grade. All it is doing is holding the splines together, so there are no forces on the bolt to worry about. I thread two bolts into the flange and insert a pry bar, then untorque/torque teh bolt.

I would have gone with T2 sized flanges like you are having made if they were available back when I bought all my parts. I got the four new Lobro CVs for less than 200 bucks so I went that way. All I need are stub axles and SAW axles to complete mysetup. Cash is tight being unemployed!

Steve

[CLKWRK]

Hi,

What do plan to do to the T1 flywheel, the ring gear spacing for a porsche and a VW are different. I beleive you will need to use a 356 flywheel for a T1 or a 914 flywheel for a T4 engine. Also, I noticed that the porsche input spline isnt as long as the VW input spline.

Bry

[GS guy]

Agreed about the axle costs Steve - certainly scared me away!

Costwise, there isn't a whole lot of cost difference between T2 and 930 for the CVs themselves - it's the 930 boot prices that blow you out of the water. Plus the 930 spline axles are a bit higher too (for new axles) - it all adds up pretty quickly.

Jeff