slipping clutch wit 3.0L motor and 901 gearbox

ggraaf · ggraaf's Garage

Hi,
after modifying my 914 to a 914-6 with a 3.0 SC (K-JET) motor my clutch starts to slip after only 2000 km driving.

I am using the original gearbox from the 914 (the so-called 901 type). Therefore I have cut off the ring gear from the flywheel of the 4-cylinder motor and bolted it onto the flywheel of the 3.0. No drilling was needed in the 3.0 flywheel. I also used the old pressure plate that belongs to the 901 gearbox, as it stilll looked in good shape. However, I renewed the clutch.

I suspect the surface of this clutch and pressure from the pressure plate is insufficient for the (180 HP) 3.0L motor. My question is if the Sachs SPORTS pressure plate (#88-3082-999-741-M410 from Pelicanparts) will be strong enough. Though this is quite an expensive pressure plate, it is still cheaper and lighter than converting a 915 gearbox.

Does anybody have a suggestion or specs of this pressure plate? Eventually, the original Sachs number is welcome as well.
Thanks very much,
Gerber van der Graaf

Joe Ricard · Joe Ricard's Garage

Maybe you are not getting enough clamping force as a result of your modifcation. There is a max distance from the pressure plate mounting surface to the flywheel friction surface.
Off the top of my head I can't remember what it is. It's in the factory manual however.

If you need another sachs clutch disc I have a brand new one I won't be using. PM for a REALLY good price.

SirAndy · 08-03-2010, 09:23 AM

Quote:

Originally Posted by Joe Ricard

Maybe you are not getting enough clamping force as a result of your modifcation.

I agree.

I went with a Stage-II clutch and pressure-plate package from KEP for my conversion. (See link below)
Porsche Pressure Plates

You'll need something that can handle the torque ...

Andy

ggraaf · ggraaf's Garage

Thanks Andy, this might be a good solution. Gerber

rfuerst911sc · 08-03-2010, 02:00 PM

I also am using the KEP Stage II pressure plate and clutch disc with my 3.0 works fine. I think it's good for up to 275 ft. lbs. of torque but has a very easy clutch pedal feel.

red-beard · red-beard's Garage

I used the SACHS clutch with my 914-6 after the HP upgrades. It was well over 200 HP and worked fine.