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TonyZ, You can overcool an engine, if the pistons/cylinders/heads are too cool you get inefficent combustion, fuel washdown, incorrect running clearances. It's all a balancing act to get the engine to run it's best.
Jake has run dyno tests with the same engine swapping out a 911 fan/shroud for a type 1 DTM style fan/shroud and found the 911 system consumed more HP and did not cool as well! Back to back tests on a dyno don't lie.
If someone really wants to run a 911 shroud it should be because of the "cool factor" not for extra cooling capacity and understand that they would make a little more power with a type 1 system. Am I down on 911 systems? Absolutly not, that's what is on my engine but I know the trade offs.
I have an 11 blade fan with a 1-1 drive ratio. I have coated the cylinders and heads with a high tech heat sheading coating and the piston tops, combustion chambers, and valve heads with ceramic coating to contain the heat in the combustion process. The compression ratio is set at 10-1. I live in an area that gets pretty hot in the summer, 90-100 degrees. I hope I have achieved an effective balance between heat generation and cooling capacity.
ken
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May 30th 2003, 11:04
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