I just recently purchased an '87 944S. While on a Porsche tour, my car started knocking and quit running. After opening up the oil filter and filtering the oil, etc. It was determined bearings went out and chewed up the interior of the engine.

Therefore, I am having a 944S engine "surrogate" rebuilt. While having to get a "new" engine, my mechanic and I were going to replace the rod bearings to be safe. One thing led to another and another to where the whole engine is being rebuilt. (Much to my wallet's chagrin!)

My mechanic is a local PCA racer that decided to open up a shop. Anyway, we were discussing rod bearings, oil lubrication, and he mentioned he thinks he has heard of drilling crankshafts for better oil flow to the rod and main bearings. Has anyone heard of this? Is it something we should look into? Are there sources to look into? Or was this for a different car?? TIA

Brian

 

it has been done many times on 944's do a search in the main forum 924/944/968 and u should get lots of listings.

 

There are at lest 3 schools of throught.

1) Cross drill all 4 ( most common)
2) Prependicular "perp" drill all 4 (second most common)
3) Cross drill only rods #2 and #3 (least common)

I got lucky and my current 84 944 block came with a #1) style cross drill and this motor has served me well. I did number #3) to my current spare motor based on the advice of another 944 racer that apparent did some flow test of the stock crank. To my knowledge he is the only one do do that. He tested #1 and it was ok, but found #3 to be better. He does it to all the 944's he prepared and seems to have good sucess.

 

Why would you drill through the crankshaft? Is it for better oil flow/cooling of the pistons and whatnot?

thanks

 

Better oiling of the rod bearings actually

 

ok cool thanks man