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Compression on street ported motors?

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Old Nov 6, 2023 | 05:31 PM
  #26  
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From: Mesa, AZ
Originally Posted by GoodfellaFD3S
Don't confuse cranking compression with compression ratio--- two completely different things.

I've always loved seeing when some guys try and sell their FD with compression in say the 80s, and try and imply that it's a solid reading based on the 'heavily ported' engine. Hogwash.
Or they tell you it's 110psi on every face, then you do a compression test and the rear rotor is in the 80s, then the engine builder says 80s is fine. Hogwash.
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Old Nov 7, 2023 | 11:39 AM
  #27  
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From: on the rev limiter
same for the “it just needs some more break in miles” line too
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Old Nov 7, 2023 | 09:09 PM
  #28  
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Originally Posted by TeamRX8
same for the “it just needs some more break in miles” line too
.
what's your opinion on this comp test? it's a 8.5:1 semi pp large street ported engine

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Old Nov 10, 2023 | 11:08 AM
  #29  
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From: on the rev limiter
pretty sure that exceeds the statute of limitations

otherwise not enough data to normalize it to 250 rpm, Miami is about as close to sea level as they come though.

the point is that big gains after initially running the engine some aren’t likely to happen. Another false idea is that the low readings will get closer to the higher readings. It could go just the opposite.
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