C2 Cylinders/Head Seepage

WERK I · WERK I's Garage

Do any of you remember the problems with some of the C2 cylinders/heads seeping oil? I know there were only a small percentage of engines with the problem but I was wondering if any of you recall how it happened. Was the the heads, the cylinders?

sand_man · 06:18 AM

The only thing I can remember was that (I *THINK*) a special gasket/o-ring needed to be used with the cylinders.

JeremyD · JeremyD's Garage

Heads to cylinders - Porsche bulliten states that if the area is wet to the touch - they need to be addressed.

The solution is new P & C's - although I think that Ollies is now machining in a later sealing groove.

Steve@Rennsport · 05-14-2008, 09:51 AM

Quote:

Originally Posted by WERK-I

Do any of you remember the problems with some of the C2 cylinders/heads seeping oil? I know there were only a small percentage of engines with the problem but I was wondering if any of you recall how it happened. Was the the heads, the cylinders?

Dave,

The leakage was due to lack of sealing rings between the heads and cylinders. Late, replacement cylinders had a groove for a gasket and the heads can be machined to suit.

We've had really good luck machining those early heads for a sealing ring and them modifying the tops of the existing cylinders to fit. After 20+ sets over the past 6-7 years, nary a leak.

Jeff Alton · 05-14-2008, 09:59 AM

I had one of those sets Steve speaks of, working great!

Cheers

racing97 · 05-15-2008, 07:14 AM

Quote:

Originally Posted by Steve@Rennsport

Dave,

We've had really good luck machining those early heads for a sealing ring and them modifying the tops of the existing cylinders to fit. After 20+ sets over the past 6-7 years, nary a leak.

Steve, if it isn't giving away some proprietary situation, I am intrigued how after surfacing the heads out to the later barrel specs you can reuse the barrels.
I respect that kind of ingenuity. Once again if you don't mind a picture would be cool.

Steve@Rennsport · 05-15-2008, 07:26 AM

Quote:

Originally Posted by racing97

Steve, if it isn't giving away some proprietary situation, I am intrigued how after surfacing the heads out to the later barrel specs you can reuse the barrels.
I respect that kind of ingenuity. Once again if you don't mind a picture would be cool.

I don't have any pictures but we machine the heads for the later sealing rings and put a small bevel on the top edges of the cylinders to exert pressure on the rings.

Works great.

ischmitz · ischmitz's Garage

I run a set of "early" C2 barrels machined by Walt from Competition Engineering. They were a warrantly replacement. He machined a step into the top sealing surface and I put a fire-ring in from the Turbo. The engine is leak-free for 20.000 miles now and I am very happy with that. Mine were leaking a lot before and were unsalvageable. They went out of round.

Ingo