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lucittm lucittm is offline
Manassas, VA
 
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Join Date: Apr 2007
Posts: 1,211
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930turbo,
Thanks for that explanation, it was the missing link for me. Now let me see if I have this right: A 3 x3 mm (?) groove is made from under the edge of intake spring seat on a slight angle (?) and it leads to a 3mm hole (?) that is drilled in the middle of the head but offset to miss the studs and at such an angle that it bisects the exhaust valve guide which has no stem seal because the oil is constantly running out of it due to gravity and the exhaust port pressure.

Is that it? Brilliant! I suppose the flow of oil could be controlled by the size of the groove/hole, but at some point you need flow. And it would be important to keep the cam tower sealant to a minimum in the immediate area of the groove.

Do you mind strenuously if I ask you who did the work and, if outsourced, how much it cost?

I see no reason not to do this mod to every turbo engine. I wonder what Henry would say...?

Mark
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1991 964 Polar Silver Metallic Turbo Coupe
Old 01-29-2009, 12:42 PM
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