Quote:
Originally Posted by KTL
Mahle didn't make the heads so don't blame them? 
I gots a spark plug like that too!
What Craig is saying about the cam housings isn't about the bore dimensions. It's about one head being the wrong height and then when you bolt the housing to the head, it potentially distorts the housing such that the four cam bearing bores are not co-linear. That would make the cam difficult to turn.
These cam housings seem to be somewhat of a dimensionally unstable casting. You can check the flatness of the housing's head sealing surface and the valve cover surfaces and you'll rarely find them to be anywhere near flat. Seems a lot of them are slightly "twisted" when they're not mounted on the heads. I suspect when they are mounted to the heads, they straighten out a bit. |
If the bores were misaligned and it ran. My guess is that there would be a bore distortion. That would be th first thing I look for. Then move forward from there. As for Mahle making the heads. My comment was meant to question everyone’s quality control after finding the head issue slipping thru at Porsche.
02-19-2018, 06:00 AM
