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911st 911st is offline
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Join Date: Jan 2004
Location: Sacramento
Posts: 7,269
Originally Posted by jwasbury View Post
That oil groove is on the intake valve side...just looked at Bruce Anderson's book and its the same. I believe there is a hole drilled from the end of that groove down at an angle that hits the exhaust valve guide.
I think you have got it.

My guess:

The spray bar sprays the cam, the cam flips oil toward the intake valve, oil runs down across the grove which guides oil down through a hole to the exhaust valve stem.

Heat at the stem helps to draw the oil in.

Oil at the guide bridges the gap to the stem and helps the heat transfer from the valve to the guide.

As our heads are basically oil cooled I wonder if it makes sense to increase the size of the orifices in the spray bar like Porsche did to the piston squirters?

I am thinking we do not want to run the 3.2 Carrera oil limiters that may come with a tensioner kit.
Old 12-30-2009, 06:56 AM
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