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California98Civic · 07-04-2015, 06:12 PM

I don't know, but you also might want to look at valve lash. That's pretty high compression for such an old car so maybe there is not much overlap between intake and exhaust valves, upping your compression test result numbers abou what you say is factory specification. Normally, compression drops over the life of the engine, if I understand correctly. Somehow you have really significantly defied history. Here is a link I found to some dudes discussing why compression test results might be higher than spec: too high compression test results? - Team Integra Forums - Team Integra ... carbon deposits is something they suspect. Hmmm... your car might reasonably be down 20-50 psi from 178 after all those miles, but instead you are above spec?

Also, Old Mech (above) is right: one tooth off on your engine would be quite a large change and I think you'd have wrecked it in seconds, with a piston crashing into valves.

Last, it is July 4th and lots of EM members are in the USA, so ... I expect your responses might be a bit few today. I'm leaving for a cook-out right now.

good luck!

07-04-2015, 06:12 PM	#6 (permalink)
California98Civic Cyborg ECU Join Date: Mar 2011 Location: Coastal Southern California Posts: 6,299 Black and Green - '98 Honda Civic DX Coupe Team Honda 90 day: 66.42 mpg (US) Black and Red - '00 Nashbar Custom built eBike 90 day: 3671.43 mpg (US) Thanks: 2,373 Thanked 2,174 Times in 1,470 Posts	I don't know, but you also might want to look at valve lash. That's pretty high compression for such an old car so maybe there is not much overlap between intake and exhaust valves, upping your compression test result numbers abou what you say is factory specification. Normally, compression drops over the life of the engine, if I understand correctly. Somehow you have really significantly defied history. Here is a link I found to some dudes discussing why compression test results might be higher than spec: too high compression test results? - Team Integra Forums - Team Integra ... carbon deposits is something they suspect. Hmmm... your car might reasonably be down 20-50 psi from 178 after all those miles, but instead you are above spec? Also, Old Mech (above) is right: one tooth off on your engine would be quite a large change and I think you'd have wrecked it in seconds, with a piston crashing into valves. Last, it is July 4th and lots of EM members are in the USA, so ... I expect your responses might be a bit few today. I'm leaving for a cook-out right now. good luck! __________________ See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.