Clutch/ flywheel recomendation 2.7/901

Peteinjp · 07:33 AM

I have a 2.7 single plug 7r putting out around 220hp with a 901 box (914) and needed to pull the transaxle to shim the ball pivot. Upon doing so I noticed several teeth are missing (hiTorque) and that the PP and flywheel (QSC) show signs of over heating so it all needs to be replaced.

Strangely the flywheel shows heating on just one area..? I didn’t check the runout before I pulled it so…. FWIW it’s a QSC and just about the cheapest option out there. Needless to say I’ll be goin with a German unit this time.

I’ll probably go with a stock flywheel (am considering a lightened one) but mostly I want to be sure that the PP and disc are up to the task of handling the power of the 2.7. In this case it may well have been the fact that the ball was not shimmed properly and I could not get this adjusted well that caused the over heating- however I never once noticed the clutch slipping.

Not a track car obviously but driven hard for 3-4 hour stints regularly.

Recommendations?

stownsen914 · 04:48 AM

It looks like you have a 2.0L 215mm clutch and flywheel. Upgrading to the 225mm setup requires either a different transmission case or converting yours to run the 70-71 style clutch lever. It's not a small job and may not be worth it. You could try Kennedy and see what they offer in terms of higher capacity clutches for Porsche 911 in 215mm size.

I don't have any experience with QSC clutches, but their quality is generally regarded as so-so, so you may be correct to look elsewhere.

One thing re: the teeth coming off. You mention having a hi torque starter. Some of those need shimming to sit at the correct depth to avoid uneven wear on the flywheel teeth. Take a look at the other teeth on your flywheel to make sure the wear pattern is at the right depth. If not, it may be worth shimming the starter.

Peteinjp · 05-07-2023, 05:48 PM

Thanks- I'm not changing cases. I would try this same combo again first (but with a sebro flywheel.)

Thats a good point about looking at the other teeth. I'll have a look. The teeth on the starter itself are a little rough. I wrote to IMI about how to shim etc.but did not hear back.

I'm considering a lighter 906 type flywheel but the main thing is just to be sure that the combo is good for the 2.7. I tend to think that the damage was caused from the clutch ball not being shimmed properly therefor may have slipped during use- but again I never noticed any slippage so it must have been subtle.

Pete

Peteinjp · 07:27 AM

I’m checking with Kennedy. What parts are needed/recommended for the 225 upgrade. I like light…. But it it is a street car.

So lever/ TOB/ cable stop??? 6 bolt 215 flywheel…? Edit- I get it- requires moving the pivot ball to the other side of the bell housing….

Pete

ADDvanced · ADDvanced's Garage

I'd go with stock flywheel and sachs performance pp (aluminum not steel, 8lbs lighter). Very happy with mine. Idk if they offer one for a 901 tho.

Peteinjp · 05-08-2023, 10:30 AM

I may end up with just that- which is what was on the car until this point. My understanding is that the HD pressure plate is good for 190ft/lbs which is exactly where my car maxes out.

Pete

ADDvanced · ADDvanced's Garage

I think we are talking about different things. The power clutch kit is aluminum and maxes out over 300 ft/lbs. It does not say "HD" anywhere.

https://www.fvd.net/us-en/FVD11691500/power-clutch-kit-sachs-911-915-transmission-1972-86-331-ft-lbs-max.html

Peteinjp · 05-08-2023, 11:12 AM

Thanks- that is different. I think that one is a 225mm unit? I did inquire with FVD and the only unit they have that fits my application (215) is good for 192ft/lbs. was the response I got.

https://www.fvd.net/de-en/FVD1169013/sport-clutch-kit-911-20-l-1965-69-914-zf-sachs-performance-192-ft-lbs-max.html

Pete