Quote:
Originally Posted by dtw
Not to get too far off topic - but 911 heads are designed to transfer heat from the combustion process out of the combustion chamber and into the heads. Heat passes through the valves and transfers to the head through the guides and seats. If the clearance between the valve & guide/seat becomes too great, heat cannot pass into the aluminum casting (where it is cooled by the airflow) efficiently.
My engine was getting so hot that it was losing significant amounts of power when it got up there - like nearly 25% loss of power according to my butt dyno.
Not this time! Am making all the cooling mods I can get my hands on during the rebuild...
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Still doesnt make sense to me.. but ok.. anyway.. back to the nutcracker thread..
