Just a curious question about compression ??

UPSJoKeR · Sep 3, 2009

Hi I just recently had a built motor bend 2 exhaust valves SLIGHTLY, my compression was 158-155-159-52.

I noticed my AEM wideband, I was running maybe like 11.2 on PARTIAL throttle no boost AT ALL, and when i get vac to 0 it would be at 10.0, losing compression in an engine causes it to burn rich or what, the last engine that was in the car was FINE, and i reused all the sensors that were on it.

PS NO BOOST LEAKS.

UPSJoKeR · Sep 4, 2009

Bump!

93_GSX · Sep 4, 2009

I'm not sure if losing compression would cause you to run rich, esp if its the valves causing you to lose compression and not rings...

FWDEMON · Sep 5, 2009

Having the two bent exhaust valves would cause the gauges to read "Rich".

ferriolom · Sep 5, 2009

FWDEMON said:
Having the two bent exhaust valves would cause the gauges to read "Rich".

Right. Because no compression means your not fully (nearly at all) burning the fuel when it gets dumped into the chamber. Your just pushing it into the exhaust manifold.

Sebba · Sep 6, 2009

Edited for stupidity.

ferriolom · Sep 6, 2009

Sebba said:
Did you do a wet test?

??? What's the point if he knows he has bent valves?

Sebba · Sep 6, 2009

Fuck it, I'm retarded.

I scanned through for the compression numbers....

UPSJoKeR · Sep 6, 2009

LOL Thanks alot guys it makes sense, I was just afraid that my O2 was no good but it definitely makes sense that theres unburnt fuel which is triggering the gauge to read rich

I will be done with the car hopefully this week. Thanks a lot for all the replies

Just a curious question about compression ??

UPSJoKeR

UPSJoKeR

93_GSX

FWDEMON

ferriolom

Sebba

ferriolom

Sebba

UPSJoKeR

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