930 (108mm) output flange identification, Two pair with different seal landing dimensions Options

[pcar916]

Anyone know these two 108mm applications?



Both (on the right) are 108mm course-spline flanges. But as the pic below shows, the center flange has the same dimensions as the 914 flange (left) on all turned surfaces.

The 108 flange on the right is the same dimensions (on turned surfaces) as the 100mm SC flanges I use with 944 cv's on my 914.

I can just barely make out what I think may be the part number on the rightmost flange.

915.332.209/01 but this may be incorrect. It's not very distinct.

Anyone run into both at some point? My guess is that the flange on the right is from the SC era and the center one is an earlier turbo, but I'm basing that on the SC dimension match, not from actual fact.

Ideas?

[pcar916]

I'm still running the 914 trans and a GT LSD/100mm 944 cv's and a 3.6L engine. The turbo flanges won't be used until a big horsepower conversion is on the table. I'd rather put the money into driving experience, safety and suspension upgrades, and get more horsepower (for now) by lightening the car.

The turbo (axle) gear is so much heavier than the 944/911 gear that it didn't seem to make sense to convert to it yet.

I've always understood the 930 cv's to be 108's and you're right about the 110mm measurement on the flanges. But both of these flanges are identical in that respect.

The difference in the two flange pairs makes for about 1/4 in in total length, which will potentially make a difference in the axle length if I specify a custom axle.

I hear you about the 930. I don't have one sitting around but have a Quaffe diff ready to put into either a 915 (which I do have) or a 930. What I don't have are fine-splined 930 flanges. But that's another story.

I still want to find out what application the longer flange is for. Perhaps it's an aftermarket flange for off road. A man's gotta know what he's working with!

[stewteral]

I'm still running the 914 trans and a GT LSD/100mm 944 cv's and a 3.6L engine. The turbo flanges won't be used until a big horsepower conversion is on the table. I'd rather put the money into driving experience, safety and suspension upgrades, and get more horsepower (for now) by lightening the car.

The turbo (axle) gear is so much heavier than the 944/911 gear that it didn't seem to make sense to convert to it yet.

I've always understood the 930 cv's to be 108's and you're right about the 110mm measurement on the flanges. But both of these flanges are identical in that respect.

The difference in the two flange pairs makes for about 1/4 in in total length, which will potentially make a difference in the axle length if I specify a custom axle.

I hear you about the 930. I don't have one sitting around but have a Quaffe diff ready to put into either a 915 (which I do have) or a 930. What I don't have are fine-splined 930 flanges. But that's another story.

I still want to find out what application the longer flange is for. Perhaps it's an aftermarket flange for off road. A man's gotta know what he's working with!

Hey Ron,

I completely agree with your view of staying with the 914 bits as long as possible. Since you are still running the 901 box, huge axles would just asure the trans as the weak link in the power train!

That said, I believe the 901 will survive with careful shifting: After all, there are a BUNCH of 901's bolted up to V8s with torque matching your 911 engine.

As far as messing with a 915 trans, I don't know, as all I've heard is that they aren't any stronger than the 901...What do you hear? Since I'm running a built 383 Chevy, I HAD to run a 930. I would LOVE to have a G-50, even though the back end of the trans would end up right about where the rear bumper sits.

Good luck on the Great Flange Search! (IMG:style_emoticons/default/smile.gif)

Terry