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Compression on street ported motors?

Old 09-24-15, 07:22 PM
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Compression on street ported motors?

Here's a question about compression.

What is a healthy compression for motors that either have a small street port all the way to a large street port? . I'll be in the market for a rx7 in the near future and would like to pick one up that has a street port done to it and id like to know who to look for compression wise,
.

Thank you
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Old 09-24-15, 08:15 PM
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Originally Posted by turbodreamz22 View Post
Here's a question about compression.

What is a healthy compression for motors that either have a small street port all the way to a large street port? . I'll be in the market for a rx7 in the near future and would like to pick one up that has a street port done to it and id like to know who to look for compression wise,
.

Thank you
porting has nothing to do with the compression of an engine

a NEW engine should usually be around 120+psi

MOSt engines now days that are original, or rebuilt, 90-100 psi is the norm

if its below 90psi, be a littler leary, shes starting to get tired, or it wasn't rebuilt properly

also, always do a compression test with the engine HOT, I get its a pain in the **** with the hot plugs, hot wires, hot everything, but it will give you a better idea on the health of the engine
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