msupra1 Posted July 18, 2015 Share Posted July 18, 2015 have a 97 RZ-S 6spd. Stock bottom block, 66mm turbo, head has upgraded gsc 269 cams and springs/retainers. It makes 700bhp. Got the car with 68k miles (mostly stock), and now has 87k miles. Had the car for 3 years and never bothered to check the compression numbers. Got the shop to check it for me. Cylinder 5 read 158psi and the rest read 160psi. Motor had to cool down a bit but was still pretty warm. Searching around I have been seeing numbers anywhere from 124psi to 180psi that are considered good. I just wanted to see if my numbers are good. Thinking to push for a bit more power but from what I've been sold motor is very healthy. And that having larger turbo/cams will affect the motor compression a bit / lower it? cheers Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted July 18, 2015 Share Posted July 18, 2015 Thats a healthy engine, nice and close together. Thats the key really. Figures from the workshop manual :- Standard pressure: 1,079 kPa (11.0 kgf/cm2, 156 psi) or more Minimum pressure: 883 kPa (9.0 kgf/cm2, 128 psi) Difference between each cylinder: 98 kPa (1.0 kgf/cm2, 14 psi) or less Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted July 18, 2015 Share Posted July 18, 2015 Very good figures for an engine with cam duration like that. Quote Link to comment Share on other sites More sharing options...
msupra1 Posted July 19, 2015 Author Share Posted July 19, 2015 Excellent More power here we come... Quote Link to comment Share on other sites More sharing options...
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