Hi
I've been out today and done a cylinder compression test (after finally working out how to use the tester)
I followed the normal advice, a warm engine and 3 tests per cylinder with at least 5 'turn overs' on the ignition/starter motor.
I got my girlfriend to sit in the car, open the throttle and keep it down whilst cranking the engine over 5 -6 times per test. I did the 3 valve tests one after the other quite quickly, so cylinder 1 was tested 3 times, then I moved to cylinder 2 and tested that 3 times and then on to cylinders 3, 4 and 5 testing in the same fashion.
The results thankfully were pretty consistent across all 5 cylinders although cylinder 3 yielded slightly better results but by no more than about 5 -10%.
The following shows the results in PSI. I had to interpret the gauge as it kind of goes from 50 then the next number is 72 so I had to count the lines in between, and I figured each line represented about another 3 psi on the guage........
Cylinder 1
1st Test = 56
2nd Test = 59
3rd Test = 59
Cylinder 2
1st Test = 56
2nd Test = 56
3rd Test = 56
Cylinder 3
1st Test = 62
2nd Test = 59
3rd Test = 59
Cylinder 4
1st Test = 56
2nd Test = 56
3rd Test = 56
Cylinder 5 Test
1st Test = 56
2nd Test = 56
3rd Test = 56
Somewhat reassuring is that all 5 cylinders are showing roughly the same results, which tells me that if the valves are wearing, they're at least wearing at the same rate. But to be honest, I think as the results are fairly uniform across all the valves, everything should be ok.
I did however, notice a very small amount of oil on the spark plugs that wasn't there when I took the last set of spark plugs out.
Regards
James
Bookmarks