Quote:
|
Originally Posted by Jake Raby
There is no other bearing opposite the failure prone IMS bearing.
There is no bearing insert in the case, the bearing just rides against a machined portion of the case and is lubricated hydrostatically... The cams ride in the heads without bearing inserts as well.. Much like a 36HP VW engine or a 356 engine- No cam bearing inserts.
|
Well, that's a surprise! Now I am left wondering why Porsche designed the engine with a pressure lubricated bearing surface at one end of the IMS, but a sealed bearing at the other end. I know that the use of the aluminum case and head surface as bearing area is very common -- most overhead cam cylinder heads are built this way -- but the use of a sealed bearing inside an engine is highly unusual. I have seen sealed bearings used successfully inside transmissions, but in that application the bearing does not have to cope with fuel and water laden engine oil attacking the seals.
Hybrid Mode
