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Old 07-13-2008, 07:52 AM
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Originally Posted by n-gin
If it were static I would have recamended a higher ratio. Thats why I said dynamic cause this will include the intake valve closing point.
If you had 10.6 static with a intake closing point of 40* Abdc it will be 9.8 dynamic effective comp ratio.

Everything i've ever heard or read recommends a dymanic compression ratio of 8 to 8.4 for pump gas. You would have huge cranking compression in the cylinders. And what are you using to calculate this? Use the one found here and have a read. You should not use the @ .050 intake closing point.

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Old 07-13-2008, 02:34 PM
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Go for a good ol' 283. I picked this for my 55 Chev a few years ago. It's taken a lot of fine tuning but lately I've been getting a solid 26.5 mpg at 55mph steady cruising. And that's with a Q-jet. Car weighs in at 3725 lbs. Performance is very good (doesn't quite do a burnout, but pulls real strong, it beats my buddies 350ci Bel Air!).
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Old 07-13-2008, 08:47 PM
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Is it too late to suggest a diesel? They're heavy, but the benefits are incredible. Depending on what your 3000-lb car is, there might be some easy swaps for you.

Just a comparison: My father has two Duramaxes. One has a quadzilla tuner, 5" exhaust, and a cold air intake. On the dyno it puts 450hp and 900tq to the wheels. Empty it gets 22 mpg with 3.73s. Towing 10,000 lbs it can get as much as 13-14 depending on terrain and speed.

I'm not suggesting that you put a Duramax in a 3000 lb car, but the possibilities with most diesels are darn near endless, and you can look forward to mid 30's MPGs
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