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Old 05-08-2012, 08:08 PM   #1
jonosranger
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What Compression ratio on Blown 4.6?

Im sure somebody may know the answer to this. What compression ratio does a 4.6 with pi heads and a vortech with 8-10lbs of boost need? I was thinking around 9.5 to 1 but not sure. I was wondering so i know what cc pistons to get.
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Old 05-08-2012, 08:16 PM   #2
rtusnake
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Thats a pretty good ratio to go with. Just have to keep a closer eye on the plugs and the type of gas you use.
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Old 05-09-2012, 05:34 PM   #3
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If you are buying new pistons and this is a street car I would get closer to 9:1. 10 psi on a 9.5 compression motor is going to need a lot of timing removed out of the tune
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Old 05-09-2012, 06:30 PM   #4
EHardy1971
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Just throwing this out there, but the Lightning's run 8.4:1 stock with 8 psi and 91 octane or better. It may not be relevant to your question though.
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Old 05-09-2012, 09:30 PM   #5
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There is 3 options lol
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