Thread: Fuel question...i-VTEC and VTEC
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Old Sep 11, 2003 | 07:18 PM
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Kai
Rotorphile.
 
Joined: Mar 2002
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From: Richmond, VA
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It's all about the compression ratio.

The base RSX and Civic Si have 9.8:1 compression.

The RSX Type S has 11:1 compression.

Higher compression ratios require higher octane gas to prevent premature detonation of the air/fuel mixture. Premium = higher octane then regular.
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