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Old 11-21-2004 | 09:02 AM
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alfa156
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From: Woomera, AUSTRALIA
Default RE: Compression Ratio
Well, 11.1:1 is ok nowadays.
Certain Honda VTEC screamers runs at 11+:1 too.
Our premium gas is 98 octane. So it runs just fine (for my Alfa).

The new BMW M5 (V10, 5 litres, 507hp) runs at 12:1!!
It is right at the edge. But they have very advance knock sensors.
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