compression test result

johnny_k

johnny_k

Member +
I just done a compression test on a forged engine with standard headgasket, the head was skimmed a few months ago and valves reseated, i got 175 psi on all four cylinders,
is this a bit high or is it ok?

Thanks
John
 
L

laskt9

Member +
I believe 170 to 180? I know I have 150 which is a worn engine

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George611

George611

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180 is standard comp i believe, thats spot on just what you want to see! lol its a kick in the nuts to see 100 on 1 cyl. lol
 
Nippon

Nippon

Member +
I just had a compression test on Saturday. Got 150 across all cylinders. Standard engine. From reading the above that sounds a bit low to me. :(
Any advice from anyone?

Should I start saving for a forged lump now?
MD
 
Ted

Ted

Member +
Nippon said:
I just had a compression test on Saturday. Got 150 across all cylinders. Standard engine. From reading the above that sounds a bit low to me. :(
Any advice from anyone?

Should I start saving for a forged lump now?
MD
Click to expand...

Absolutely not. 180 is a bit on the high side for a forged lump.
Will have to watch out for detonation. Should make good power at relatively low boost tho.

My previous gt had 150 across all 4 and made good power for a long time.
 
Nippon

Nippon

Member +
Phew! Lol. Cheers for that Ted.
Think I am getting paranoid about engine trouble at the moment.
Well i say standard engine. I meant standard block. Its TD04 at 1bar.
 
S

Skalabala

Member +
180 is not to high at all. 2bar should not be a problem!
150 should be good for 2.5 bar. Obviously on good fuel and a tuner that is not a tard :p
 
Ted

Ted

Member +
Skalabala said:
180 is not to high at all. 2bar should not be a problem!
150 should be good for 2.5 bar. Obviously on good fuel and a tuner that is not a tard :p
Click to expand...

Well most people run 1.2 or 1.4 mm headgaskets with dished pistons on forged builds to lower compression a tad. I've got a 0.6 trd one on mine but compression isn't sky high.
 
mark1991

mark1991

Member +
I was always going to do my engine... too scared to see how bad it is lol but now i have another engine i think i will give it ago just to see
 
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