Compression test results.

[WadiaAbushanab]

I just did a compression test on my 1980 Spider 2000. It ranged from 150 to 180. That seems quite high though right? I mean what should they be?

[Nut124]

The numbers seem OK to me other than I'd like the spread to be narrower, within 5-10 psig of each other.

A mild cam can make for higher numbers even when static CR is low.

Did you hold the throttle open when cranking?

[WadiaAbushanab]

The numbers seem OK to me other than I'd like the spread to be narrower, within 5-10 psig of each other.

A mild cam can make for higher numbers even when static CR is low.

Did you hold the throttle open when cranking?

Oh no I didn’t hold the throttle open. Was I supposed to? I just cranked it a few times till the needle on the gage stopped moving.

[Nut124]

Yes, throttle needs to be open for the results to be meaningful and comparable. With the throttle open, the numbers will be higher.