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Old 06-30-2022, 01:12 PM   #7
bcj
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Garage
The Subaru FA20D boxer in the twins has a 12.5:1 compression ratio.
That's quite a squeeze for any production engine that still runs reliably.
The FA20F that they put into a WRX is reduced to 10.6:1 before they try stuffing in more with the turbo.

Honda K20A in most commuter cars is 9.8:1 and only gets bounced up to 11.5:1 for the R cars with a lot of prosthetic appliances.
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