What would low compression psi numbers suggest? I installed some 1.7 RR's and gt-40p's home ported (valves relieved, chamber smoothed, runners smoothed, guides footballed) then tested compression:
I unplugged all 8 plugs, had poured oil in before installing heads (keeps cylinders from rusting), screwed in compression tester, propped carb open, turned it over 5-6 times and stabalized at about 108-112 psi per cylinder. This number stayed solid for 5 minutes before I moved on. This engine was ice cold.
This is low! Everything looked in really good shape (minus the carbon I scraped off the pistons) blockside and topside everything was new. It doesnt really burn oil so rings are not suspect. I replaced the RR's with stamped rockers thinking I have misadjusted the RR's. The new compression results were 100-105! ARG!
Did I lower compression by relieving the valves or something? Isnt it supposed to be 150-175 psi? By the way, it runs like a scolded dog (really well)
I unplugged all 8 plugs, had poured oil in before installing heads (keeps cylinders from rusting), screwed in compression tester, propped carb open, turned it over 5-6 times and stabalized at about 108-112 psi per cylinder. This number stayed solid for 5 minutes before I moved on. This engine was ice cold.
This is low! Everything looked in really good shape (minus the carbon I scraped off the pistons) blockside and topside everything was new. It doesnt really burn oil so rings are not suspect. I replaced the RR's with stamped rockers thinking I have misadjusted the RR's. The new compression results were 100-105! ARG!
Did I lower compression by relieving the valves or something? Isnt it supposed to be 150-175 psi? By the way, it runs like a scolded dog (really well)