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Originally Posted by illumina Tom, the reason I was thinking about the Allante intake is the exact reason you've stated: the plenum will help cool the charge air temps...Am I right?
Also, here is a picture of the combustion chamber from an HT-4100 cylinder head. The 4.5 and 4.9 liter heads are exactly alike in the combustion chambers...
See what can be done here. There seems to be enough material to lower the compression ratios to your idea of 8.2:1 or so.
Let me ask you this as well: you stated that the lower compression ratio would'nt take too much power away. What are the exact losses you would expect if it was lowered to 8.2:1? If we are dealing with an engine with a higher lift cam, roller rockers, Allante intake, and head work (the whole 9 yards on the heads), you're saying that the compression loss would be minimal? Please let me know...
Here is the picture of the head combustion chamber: |
negative... 4.5L heads from 1990, '89 and later allante engines, and 4.9L engines are the same. 4.5L TBI engiens' heads arent as good