Compression on the 3rd gen 7
10-23-01, 01:15 AM
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Compression on the 3rd gen 7
What's the compression on our cars (FD, US spec engine)? I know it's 9.0 now in Japan with stronger apex seals and more boost (damn!).
Thanks
-joe
Thanks
-joe
10-23-01, 10:09 AM
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Do you mean compression ratio or the measure of compression to see if the engine is still in good working order?
There is a chart in the shop manual the shows the acceptable compression of the engine versus engine rpm....
It is roughly 7.0 kgf/cm^2 @ 250 rpm.
Patrick
There is a chart in the shop manual the shows the acceptable compression of the engine versus engine rpm....
It is roughly 7.0 kgf/cm^2 @ 250 rpm.
Patrick
10-23-01, 04:16 PM
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Don't mix up compression ratio and compression pressure. The compression ratio is 9.0/1, that is just a static value that relates the ratio of the volume of the combustion chamber between TDC and BDC. The compression pressure is spec'd at 8.5kg/cm^2 or 120psi from the factory, with a minimum of 7.0kg/cm^2 or 100psi, with a maximum difference of 1.5kg/cm^2 or 21psi between the chambers. The minimum was eventually lowered to 6.0kg/cm^2 or 85psi. I've only seen a few people actually test in the 8s, with most being in the 7s or 6s however.
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