Compression results

[BLUBB2]

Ok my lude has been running alittle rough lately so I decided to conduct a compression test.
My results were as follows:

Cylinder #1 #2 #3 #4
215 50 210 200


1,3,4 is extremely high in my opinion. I think I have a burnt valve because I also did a wet compression test (dump a tea-spoon of oil in cylinder) on #2 and the results did not change and also my spark plugs are pretty white.

Any comments,suggestions are appreciated.

BTW its an H23a1.

[F20A CB7]

Imma check a mechanic in the city that aren't dum asses. Ill find how much and where they can do a leak down test, we did everything we could.

I was suprised that 1,3,4 were so high in compression. Fukin A man only 50pds in cylinder #2.


There's no way some over heatin issue did this, and on top of that, I thought that jackass from a&a rebuilt the head, u should go back and throw ur valves at his face, along with the compression gauge

[d112crzy]

that is defnitely a bent valve on #2. also, those compression numbers aren't that high. it's a 9.8:1 compression ratio motor, not too far off from USDM H22A1(10:1) and they put out similar numbers.

[BLUBB2]

Imma check a mechanic in the city that aren't dum asses. Ill find how much and where they can do a leak down test, we did everything we could.

I was suprised that 1,3,4 were so high in compression. Fukin A man only 50pds in cylinder #2.


There's no way some over heatin issue did this, and on top of that, I thought that jackass from a&a rebuilt the head, u should go back and throw ur valves at his face, along with the compression gauge

Oh well shit happens. I think I was running really lean causing this to happen
The spark plugs were pretty white. Im beginning to think that the overheating issue had nothing to do with this.

[cp[mike]]

do you have access to a leakdown test? much more conclusive, since technically that MIGHT be a headgasket, but more likely head/valvetrain related. burnt or bent valve on #2. otherwise the other 3 cylinders look great, thats not too high. either way though that head is coming off.

[wed3k]

you arent exactly looking for how high or low the numbers are but for consistency. and if it was a leaky headgasket, it would be between two cylinders.

you may have burnt a valve if you do indicate that the plug was white.

[BLUBB2]

do you have access to a leakdown test? much more conclusive, since technically that MIGHT be a headgasket, but more likely head/valvetrain related. burnt or bent valve on #2. otherwise the other 3 cylinders look great, thats not too high. either way though that head is coming off.

Unfortunately I dont. I believe you need a compressor to do this?? correct?
Im not sure about the headgasket,I havent had any signs of it such as milky oil or white smoke.

[luckyflip]

ive heard of bending of a valve but not burning one. some clue me in.
sorry for my noobness.

[93F22A6]

My guess is that it actually burns a hole in the valve causing a leak. I'm not sure if that's right, I know if i'm wrong i'll be corrected.

[foamypirate]

What happens is that when the motor runs hot, or the exhaust flow is stagnant/blocked, there is so much heat that the valve can't conduct anymore heat through the valve seat to the cylinder head to be carried by the cooling system, and it get's hot and deforms, basically.

[wed3k]

What happens is that when the motor runs hot, or the exhaust flow is stagnant/blocked, there is so much heat that the valve can't conduct anymore heat through the valve seat to the cylinder head to be carried by the cooling system, and it get's hot and deforms, basically.

or the seat falls out

[honda_kid]

or you get some carbon built up on the valve or valve seat and the passing exhaust gasses make it glow and burn a hole in the valve.

[BLUBB2]

Ok guys Im going to adjust the valves on cylinder # 2 in attempt to see what happens. Then I Im going do another compression test on that same cylinder to see if any difference. Im not getting my hopes up high though.

[wed3k]

Ok guys Im going to adjust the valves on cylinder # 2 in attempt to see what happens. Then I Im going do another compression test on that same cylinder to see if any difference. Im not getting my hopes up high though.

adjusting the vlaves wouldnt do anything.

[BLUBB2]

Are you sure? I heard of numerous occassions when compression went back to normal after a valve lash adjustment.
So I guess the next logical thing to do is find somebody with a leak-down tester.