Quote:
Originally Posted by t walgamuth
Its a 99 sport. 110k miles on its second engine. 65 aspect tires instead of stock 60 aspect so a slight loss in gear for power. I was not close to the redline in fourth so no point in shifting to fifth.
Anyway, its all moot now it now has a 34k mile replacement engine sitting in it from a clean wrecked 99. They are changing all of the rubber suspension bushings and with any luck tomorrow I will go and pick it up.
I just was hoping someone had dyno experience so the loss in power might be quantified. I was thinking it might be down about 20 hp from optimal condition, based on a little study I did on the basis of fifties and sixties cadillac motors...(I had complete data on them is the only reason to use them).
Thanks for all the comments.
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Tom, I remember reading an article in, I think, Encyclopedia Britannica a lot of years ago that had the exact detail you want. Trouble is, I can't recall, but I think it was something like 2 or 3 % increased efficiency for each integer step in compression ratio. Somehow that doesn't sound right, as I doubt that its a straight line correlation. There is probably more impreovement from say 4:1 to 5:1 than from 10:1 to 11:1
Good to hear that you have solved the problem.
06-10-2009, 06:00 AM
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