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Old 02-11-2017 | 02:40 PM
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kreed
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Default 525 EFI question....
Anyone know what the compression ratio is on a Merc 525EFI ? And how about the combustion chamber volume of the aluminum heads that come on the 525...
thanks....
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Old 02-11-2017 | 03:45 PM
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Edelbrock 315cc intake port, 110cc exhaust port, 118cc chamber. MT posted this on another thread

I think its 8.5.1 ??
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Old 02-11-2017 | 06:35 PM
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Comp ratio is 8.75 : 1
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Old 02-11-2017 | 10:23 PM
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Young Performance
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Yep, 8.75:1. The piston volume in +1cc. The heads actually cc at about 120cc's.
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Old 02-13-2017 | 06:39 AM
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kreed
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Thanks guys...appriciate it.
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