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]

It seems ultimately a wash in strength overall, but the 915 R&P is certainly better, even in the 7:31 version simply because it's bigger... more meat, and first gear isn't cantilevered so you can explode from a start with more confidence. Especially the AX crowd. I also think a late side-cover is required in any case magnesium or not.

And I don't have a problem with the mag-case 915 differential housing since it's bearing race bosses are steel like in our 914 transaxles.

So, if the material cost of replacing more 914 boxes over time is the same as higher cost 915 boxes but fewer overhauls, I'd choose the latter to avoid down-time if the gear ratios are to my liking. My ultimate take is this. If I didn't have a few at the house I wouldn't do it.

But since I do, The 915 build/install will be a really fun project so why not? But I won't use 108 CV's until my torque/hp demands it. And you're right.

Smooth shifting saves these boxes... both of them. To the G-50. Yummy

That's a really nice machine and I love the thought of a six-speed short bell housing G-50. But like the 108's the darned thing is so heavy I'd have to run a lot more torque/horsepower to justify the hit to the power-to-weight ratio.