I am building either a 2.4 or a 2.7 type four and am wondering at what point do I start having to worry about needed something more than just the stock 2.0 liter type 4 sachs stock clutch? I know it probably depends on the cam and the amount headwork done but really can I get away with building a 2.7 with mild to fair amount of porting and abit larger valves? and obviously a sport cam. will I be seeing a lot of slippage? And Will something as simple as a particular plate help? thanks,Jo

With a 2,7 I'd say you need an upgraded clutch. Kennedy stage 1 would probably be the first choice?

I'm using a stock clutch, sachs 911 disc, on my 180hp 2.6L T4 (102X78mm)
I cut the fly pressure plate step .010 under spec.
911-901 trans with stock 914 /4 gearing, 914 flywheel, in a '67 VW bug.

So far no slippage and I'm not gentle on it, but my engine is in a 400lbs lighter VW bug.

I will say I'm totally at the limit for this set-up

I daily drive a stock sachs 901 clutch with my 235hp/205 lb/ft. 2.7L 6..

There is no slipping..

If it were me, I'd at least go to the 6-spring OEM Sachs clutch/TO Brgs/etc. as spec'd for the 914-6, over the stock 914/4 OEM clutch with 4 springs, since it's basically an easy plug-n-play upgrade to any 914.


Tom
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I agree, but can you even get the 4 spring anymore?

If your TO bearing is good you don't need a new one, there's a way to re-grease them if you have a press.

so Kennedy states the stock clutch to be good for 180 ft lbs of torque. I am surprised it will take 235 ft lbs of torque ?

I have a new 4 spring but as Mark suggests they aren't being sold anymore,mine was NOS in a very old box.
I fitted a new six spring and pressure plate,good pedal and smooth takeoff on release.
I also vote the stock clutch to be ok but all must be new and matched up with a new or machined flywheel,its up to the driver after that .

With the old 4 springs you have to be very careful about the spring to flywheel bolt spacing. You basically can only have one cut on the flywheel before you have issues with even with ground down bolts.
BTDT I had a new NOS 4 spring as well.

Likely one of the reasons why they fell out of favour so fast.