Compression test nunce!!

[JohnOBrien8]

Ok done a compression test earlier on my glanza,the results were 120psi across all cylinders,but made an awful mistake,never held the throttle open when i was turning over the engine!I was too busy worrying about the results!!
will i have to do a re-test or are them results ok?
what differences would i see if the throttle was open fully?
Cheers John

 

[Tanz]

Ya you will have to re test,,without the throttle completely open it wont give an accurate reading...

 

[JohnOBrien8]

I shouldnt be let near a car!!ok il try again tomorrow and report back!

 

[Tanz]

I shouldnt be let near a car!!ok il try again tomorrow and report back!

haha ahh maybe you should be the one wearing a skirt....lol

 

[JohnOBrien8]

the shame!!ya have to learn someway!

 

[corofin12345]

am, with the throttle closed it shouldnt give that low of reading, ive lower comp pistons than stock and i got 150psi across across all 4 with throttle closed

 

[JohnOBrien8]

what would make mine so low then?thicker gasket?

 

[corofin12345]

ud need one hell of a gasket to get those readings..(maybe gauge wont pass 120???) seems very very low??? try again with W.O.T to see.. you positive it was 120psi? thats the reading people get on one cylinder if its well goosed, 160psi,170psi would be normal for a stock engine...

 

[JohnOBrien8]

yeah definetly 120psi just over 8 bar!il try again tomorrow if i can get a different compression tester!

 

[corofin12345]

do, im intrigued

 

[JohnOBrien8]

as i said in the other thread i re-done the test with the throttle open and a brand new tester!which was 140 euro!
i got 150PSI across all cylinders!just shows how the throttle position makes a big difference!how do these results sound?
Thanks
John

 

[Johnny_C]

ive never done a compression test with the throttle open,ever.
and ive always got acurate readings.

john thats sounds low,but doesnt mean its bad,may have lower comp pistons or a thick gasket.

 

[JohnOBrien8]

Yeah johnny thats what im thinking,next thing i need to look at is timing if it was a tad off would it cause a small bit of smoke?
we,ll ive done both 120psi on all cylinders with throttle closed,150psi on all cylinders with throttle open!

 

[Johnny_C]

what colour is the smoke?if your sriving,and boost it,when you let off,then put your foot down again,does it give a puff out the rear?

 

[JohnOBrien8]

i think its white,maybe with a small tint of blue,smells oily,no i didnt notice any smoke when driving,just noticed it there again when sittin outside the off license waiting for my friend!lol!was driving for about half an hour then just stopped idling!

 

[Johnny_C]

i think its white,maybe with a small tint of blue,smells oily,no i didnt notice any smoke when driving,just noticed it there again when sittin outside the off license waiting for my friend!lol!was driving for about half an hour then just stopped idling!

try it the say i suggested,driving,and boost it, let off your foot off the throttle a few secs,then put your foot down again,and look for a puff.

 

[Skalabala]

What is the mileage of the engine?

 

[JohnOBrien8]

mileage is nearly 170,000kms

 

[Skalabala]

What oil are you using? Might be time for rebuild bud. Nice mileage!

 

[Texx]

i got 150PSI across all cylinders! how do these results sound?

Doesn't sound like anything to worry about.

The stock engine in my GT with 90K miles gives 155psi across all 4. The engine has never been apart, doesn't smoke or burn any significant amount of oil, and doesn't hang around either when you put your toe into it.

i think its white,maybe with a small tint of blue,smells oily,no i didnt notice any smoke when driving,just noticed it there again when sittin outside the off license waiting for my friend!lol!was driving for about half an hour then just stopped idling!

Sounds more likely to be a turbo problem.