Compression figures

[Sgt_Lemon]

What should the factory compression figures be for a 1.8 8v?
If someone can post off the Haynes PDF it might be worth putting the figures down for all other models as I couldn't find it within the section or searching in the MK2 section.

[gazareth]

about 180/190 is good on standard engine. but your engine is cammed yeah. so I would just make sure they are even from cylinder to cylinder.

[Sgt_Lemon]

Thanks, will check it out tomorrow.

[Sgt_Lemon]

I just did a compression test, got from 1-4 figures of   150/ 145/ 145/ 145.

[Gambit]

Was that with throttle wide open? Thats low, try a diff compression gauge also

[Sgt_Lemon]

Throttle wide open. The book says between 145-190 is good. To be honest though I'm happy that they ae all close, not sure the tester I got at a car boot for £5 can be trusted.

[gazareth]

they will read lower at cranking due to the sports cam and modified head you have fitted. but they are very even. when I tested mine one of them was 195 and other 3 were 190. did retorquing the head stop your coolant loss btw?

[Gambit]

How will they read lower with cam & head job? The valves are closed so no difference in compression

145 is too low, try a different gauge

[clipperjay]

Agreed okay but would personally like to see a bit higher than 145 soon or later rings or valve stems will need doing sooner than later?

[Sgt_Lemon]

The tester I used wouldn't hold a value so 2 people were needed so I doubt the accuracy of the figures.