Compression Test

[Heliox]

Can anyone tell me what compression readings I should be getting for my 4.3 V8 Griff as im about to put some new plugs in and thought i'd do a compression test at the same time.

many thanks

h

[Boosted LS1]

Hi Helioux,

I had a low compression engine done at 160 odd so I'd expect anything over that to be a bonus. Maybe 180-190 might be about right?

[steve_D]

The actual figure is not to important. Having them all read about the same is what you are looking for.
A worn engine will have one or more cylinders with poor readings while the remaining good cylinders are trying to keep the ship afloat.
Steve

[wedg1e]

I did a comp. test on the Esprit the other week. I sh@t myself when no.3 read 40 psi lower than the other 3 cylinders. Turned out the gauge wasn't quite screwed in tight enough... hew:

<pause>

Just dug out the figures from the last compression test I did on the TVR: either side of 170 psi. That's a 3948 running abut 9.25:1 c.r., with less than 5000 miles on the pistons and bores.


Ian

[Heliox]

Ok ,thank you for the info.

h

will make sure its screwed in properly

[chris_n]

Maybe stating the obvious, but make sure the engine has been warmed up as well.