I just did a compression test on my friend's 94 hatch...I'm not sure of the model, but I think it's either a CX or DX, I didn't look at the engine code cuz it was hella dirty and I was too lazy to wipe it, haha... but the numbers read (from left to right) 160-155-150-130(psi) what do guys think?

 

id say head gasket 100%. you could leak down test it if you want

 

how can you say 100% head gasket. there is definately a problem w/ one cylinder, but no way to tell if its head gasket, bent valve, rings, etc... did you do the test correctly, full operating temp, WOT, etc... if so do the wet test, add some oil to the low cyl. do the test again, if the number is on par MOST likely cause is rings, other than that a leakdown test is needed.

 

ok not 100% but i bet that the problem,most common

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tatmark1 &raquo;</TD></TR><TR><TD CLASS="quote">ok not 100% but i bet that the problem,most common
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i'll call you up when i want you as my mechanic.

 

ok i wont expect a call any time soon

 

the test was done at normal operating temp and at WOT...i didnt do a wet test though, but i did it right after the car has been driving around all day, so wouldnt there still be a good amount of oil on the cylinder walls?

 

that's not the point.

 

right, still do the wet test if you plan on fixing it, if you dont plan to fix it dont worry about it, just get another longblock.

 

and so what is? im my experiances that is the most common. sure his rings might be shot but he would probly see some somking and oil lose but maybe not . or his valves which are also likely. either way heads coming off head goes to machine shop to get checked out , surface ect..at least i would id have my valves looked at then. heads off you can tell if the rings are shot.
but im sure in your 19 yrs you have worked on tons of cars and your a well seasoned mechanic
and i didnt say he shouldnt check tthe others

 

can tell the rings are good or not by pulling the head???? not following this???

 

if you have excessive piston movement side to side, no cross hatch left on cylinder walls. thats a good sign.
but he should check before pulling i agree with you

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tatmark1 &raquo;</TD></TR><TR><TD CLASS="quote">and so what is? im my experiances that is the most common. sure his rings might be shot but he would probly see some somking and oil lose but maybe not . or his valves which are also likely. either way heads coming off head goes to machine shop to get checked out , surface ect..at least i would id have my valves looked at then. heads off you can tell if the rings are shot.
but im sure in your 19 yrs you have worked on tons of cars and your a well seasoned mechanic
and i didnt say he shouldnt check tthe others</TD></TR></TABLE>

you're trying to give him answers right off the bat. you're not there. we're not there. we are trying to help diagnose the problem. you rush to fix.

 

tell me where i told him to rip the thing apart!

 

so you are telling me that you are a mechanic??? side to side movement of the piston in the bore is caused by bad rings??? sure thing.

 

im not currently working as one but i have. exsesive= not within specs. not a sure thing but a very good sign.
think about it. rings wear out and they are not as "tight" piston will have more play

 

you must not know how close the piston to cylinder wall clearances are, basically if it moves the piston or sleeve is bad. the bad rings wont cause the piston to move. i dont have to think about it, i do this daily.

 

piston will move slightly, if worn it will have some play.
and helicoil doenst work in alum either...ok
d16 pisto to cylinder wall clearance .0004 to .0016
serice limit .002
it will move
worn rings and cylinder wall = more play

 

point is: you cant check the rings by trying to move the piston in the cyl. i know the specs, and of coarse they will move, but we are talking about .0004", can you honestly feel that??? now lets just say they do move in the bore, how does that justify that the rings are bad, whos to say the piston and bore isnt worn. you using a dial indicator inside the bore??? lets just end this and both agree that you should do a leakdown and wet compression test to verify bad rings, not pull the head and wiggle the piston.

 

i did agree that those test where good idea.
you can see .0004 move
but again i agree with you on the test