Ok i performed a compression test on my Z the drivers side cylinders had 150 and the passengers side cylinders had 165. Also my vaccum for my car is 16. With this compression test is their something wrong with my valves or timing chain after my cam install or even the technosqaure reflash. Can the cams cause this loss of compression also if the timing chain is not in correct. Can this be normal for my cams and the mods i have to have this compression reading also?

Please help Glen


Thanks Glen

 

cams I dont think can cause compression loss,

but I am not that much of an Expert on this!
But I am positive that the TS reflash cant change compression ratio

 

Does anyone know the normal compression numbers. I would please like to know some numbers you may have gotten or someone else not what the factory book says.

Please help

Thank you Glen

 

The book is spec... all the cars I have seen tested are within the manuals numbers.

 

I know this but what were the numbers is 165 and 150 to low? The manual says the numbers can be bewteen their, but i keep hearing adleast 180 for each cylinder.

thanks Glen

 

Make sure the throttle is wide open when pulling a compression check...cams with more duration and valve overlap will usually have less static compression when all else being equal...compression PSI. will be greater at sea level than at ...say 6000 ft. altitude

 

If you have cams with more overlap, the compression will go down a bit.

 

ok thank you so much ,but is it normal to have 150 on one bank and 165 on the other.

Thanks Glen

 

comp is between 142 and 210. You're on the low end, but within spec, to the best of my knowledge.