Compression ratio ???? - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 3 Old 10-31-2005, 06:53 PM Thread Starter
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Question Compression ratio ????

I have a question regarding compression ratio on my friend's turbo'ed 412W

He is building his Dart 3.85" stroke * 4.125" bore with a T-80BB ~7000rpm
He should be pushing the turbo to it's max, dunno how this will translate in boost figures, but whatever, what compression ratio you guy's think is optimum?

He'll be running race gaz anyways, and he has a large intercooler.His guesstimates are un the 1000-1100 fhp.

His builder, says 7.5- 8.0:1, while i think more 8.5:1
He has Oliver 6.200 rods, and they want to change them for something a little shorter to decrease CR.
He's having the cam custom made by Cam Motion and they said the big dog's run 7.XX:1 for compression ratio's, maybe they're right, but he's not building an engine that wild.


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post #2 of 3 Old 10-31-2005, 10:55 PM
 
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if he is wanting any real streetablility, i would not go under 8.1........8.5to1 would be ideal for street and strip in my humble opinion.....



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post #3 of 3 Old 11-01-2005, 06:07 AM
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I agree-8 to 8.5:1 should be good for a street motor. But it is not going to be street if he is getting is it set up for race gas(?). It does sound like it will be on the wild side. If so, and he does not care about street driving maybe the builder and cam makers (and tuners!) advice is something to consider.
Erich

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