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Old 01-30-2012, 09:18 AM   #1
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Boosted CR

Why do Forced induction engines have lower compression ratios?
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Old 01-30-2012, 11:31 AM   #2
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Boost makes compression
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Old 01-30-2012, 11:34 AM   #3
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Re: Boosted CR

the less compression the more room you have to shove more air in the cylinder. Boost is ONLY a measure of resistance, the more free flowing something is the less the boost will be.

For example if I have 14psi on my engine at this time, I then install long tube headers... my boost will go down as the resistance is less so the air moves more freely.

lower compression helps reduce knock issues as well so I think
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Old 01-30-2012, 12:21 PM   #4
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I don't agree with the measure of resistance I understand where your coming from but I feel its more a measure of added air in the cylinders. If you put bigger headers on the boost might go down but so will the amount of room for fuel. You need the boost numbers to use fit more fuel. More fuel = more power

---------- Post added at 12:21 PM ---------- Previous post was at 11:54 AM ----------

When the forced air is used in the cylinders the valves are closed so the exhaust doesn't really have a whole lot to do with it besides removing the used/burnt fumes.
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