Low compression on motor??

[randomwalk101]

What is the possible reason to get low compression on your motor? What needs to be replaced?? rings/valves/what??? How much (approx) will the cost of repair be?

[JRCivic]

It all depends on the damage... have you done a LEAKDOWN test yet to see where the loss is coming from ????


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'93 Civic Si H/B with B18C1, JRSC @ 8psi
Best 1320: 12.68 at 110 mph

[TrustGs-R]

yes..can be any of those...
can also mean dead pistons...broken ring landings..etc.

rip the shit open and good luck....

i busted 3 of 4 pistons' ring landings....beat that!

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96 turbo gsr hitting 11s
90 hybrid hatch hitting 12s

JRSC is garbage. I speak from experience.

[TrustGs-R]

oh ya..about the costs...that varies on wats wrong, who does the labor, and wat goes back into the car.

I went all out and rebuilt my bottom end with the best stuff out there....I also did ALL the rebuild myself in my garage....I also had 3 dead pistons (not to mention rings). =)

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96 turbo gsr hitting 11s
90 hybrid hatch hitting 12s

JRSC is garbage. I speak from experience.

[waveoff]

A simple test to see if your rings are contributing to low compression is to pour a capful of oil into the sparkplug hole. This temporarily seals the rings. If the rings are leaky, your compression will be higher after you pour the oil in. Club DSM shows you how to do it. http://www.dsm.org/menu.epl?item=485#0 There's a thing there about doing a leakdown test yourself as well. If you're really worried about your compression the best way to determine what is exactly wrong, without tearing your engine apart, is to do a leakdown test.

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Fred G.
'97 Civic EX supercharged http://www.geocities.com/motorcity/track/4059
Beech 1900D driver...2,558 shp, 10,000+ ft./lbs. tq., top speed 331 mph

[This message has been edited by waveoff (edited August 06, 2001).]