im getting valve stem oil seals replaed on my car as car had been smoking on start up on mornings.would clear after half a mile.
the guy doing this said hell do a compresion test at the same time.does anyone now what the figure should be roughly or is it more important that there all very simalar
any help would be much appriciated

 

standard is 8.2:1, but the reading you will recieve will be in PSI/bar not sure what it should be tho

 

Compression ratio and compression test are two different things.

It's more of a case of the reading from each pot should be similar (within 10% of each other) and do the test dry, and then again, wet.

 

thats what i was wondering what it should be in psi

 

its a compression test not the ratio i was after

 

The figures vary from car to car, wouldn't like to hazard a guess, so up for any RST peeps who've done a test on theirs for comparison.

 

Compression pressure at starter cranking should be about 12 - 14 bar

 

i must be on cloud 9 tonight

 

MK5RST, so your saying it should be 180psi
is it about 14.9psi to 1bar?

 

vroooom ptssssh, I was very surprized at your post lol, thought u must be f***** Stoned cus ur not usualy dense

 

davS2, The book says 12 to 14 bar

 

MK5RST, My excuse is i had something else on my mind at the moment of posting

i'll have a look in the haynes manual for ye Dave.

 

Ford tecbical data states that pressure, vroooom ptssssh, Hope it wasnt my GF That was on ur mind

 

MK5RST, let's see a pic and i'll tell you if it was her


cant find anything in haynes apart from i was again wrong and just to clarify, the CR of anERST is 8.3:1 someone work it out if we have compression ratio,

8.3:1 cr
1597cc
bore: 79.96
stroke: 79.52

suerly

 

theres no defined pressure really as even brand new engines are different, but they should all be within 10-15psi of each other otherwise theres a problem

 

vroooom ptssssh, she looks like ur mum but younger PMSL

 

Jeez, i knew you went with munters but....

 

Lol, cheeky c***

 

I know, imagine asking US for compresion test results

 

Yeah mate, no 1 10,2:1 no 2 10,1:1 no 3 9,9:1 and no 4 10,4:1 That wud go down realy well