BlackRs

Did a compression test on my s2 and all four cylinders showed 90. A standard s2 should be all roughly 150 im told. Is this correct?

Cheers

turbo.jon

My engine im using at moment is low comp and that was 125psi on all 4 when i tested it which is 9 bar roughly what is your psi or bar??

BlackRs

doesnt sound too good then my engine. Will have to wait and see. Cheers for the help

Badman38

iTrader: (2)

90psi i would say rebuild mate thats way too low

BlackRs

My engine was rebuilt not long ago. Boosts fine sounds sweet aswell. No rattles or anything tappety. But was thinking it was a little low.

Badman38

iTrader: (2)

when you conducted the compression test did you open the throttle is the gauge working properly because something amiss

ivorbiggun

Have you measured that correctly cos strictly speaking it shouldn't run. And do you have anything to compare it to cos off boost it must be bloody awful.

BlackRs

well thats the problem. Replaced the thermostat, leads and did a complete engine coolant flush. Started the car up and it sat running for a good half an hour. Drove up the road and it just cut out. No spluttering, no bang just cut out. Since then the car hasnt started. Did a compression test and showed the above results. But what im stuck on is that the engine ran, drove & started spot on without any noise at all. Also if the engine was fcked wouldnt the compression be uneven??

Ive also tried a differant ecu,dizzy,rotary arm & plugs. Oh and its gone fuel. Aswell as spark and the pump is priming.

S1 JOHN

mine is low comp if i remember rightly it was 125 on all four so 90 is quite low is the guage accurate can you lay your hands on another one?

BlackRs

Will try another one as a rebuild is not wanted i really wanted to hear at the moment but it seems that, that is the way its going.

Badman38

iTrader: (2)

mine was down to 100psi on number one cylinder and the car missed like mad below 2000rpm 90psi something badly gone wrong

Oranoco

I'm sure mine is 90 across all four and it still goes like buggery and doesn't use a drop of oil or smoke at all

Badman38

iTrader: (2)

you sure m8 90psi car would have trouble starting thats if it would start at all

Oranoco

I might be wrong then but I'm pretty sure that's what it was

ivorbiggun

OK Kiddies, lets remember we're all playing silly buggers with cars and components that are the best part of 20 years old. When doing things like
flushing engines, corrosion is quite likely to to rear it's ugly head...
even if it has had had anti freeze at the correct levels for those 2 decades
it's not inconceivable that some of that alloy head has called it a day
and just let go. Not sure why one would decide to flush an engine but as me old Grandad used to say.......if ain't broke don't try to fix it.

ASHCOSSIE

i once had an engine in my rs the bores went oval and that had very low comp on all cylinders and i was told that below 90psi the car would not start and it dident so i scraped the lump i hope thats not your case as u said it was rebuilt a while back
does anyone know what causes an engins bores to go oval?is it high milage or some thing along them lines?

addiction

should be 150 across the 4 cylinders

andre_k

iTrader: (2)

scrap the low comp, and bang a standard engine in... all will be ok.

Big-J

mine is 120 mate running low comp pistons