compression

[fastbuff]

what will be the right compression on an LS1, thanks

[Steve Crowe]

How old is it? How many miles? Got a good gauge?

140 or so is fine across these engines, 160 is primo. 120 and it's time to look.

Your concerns lie in how how well one cylinder relates to the other compression wise. Look for the balance.

[fastbuff]

Are there any symtoms to an engine or a piston with low compression? and do i have to check all Pistons that last one will suck to check

[Steve Crowe]

Symptoms yes but in most cases I'd rule that out.

What's going on that has your concerned?

[fastbuff]

Im getting some vibration on the car all the time like a misfire or sothing but i changed the wires and the plugs and everithing car still feels the same and im not getting a check engine light or nothing like that i also replaced the pcv valve and the cats and nothing happend still the same funny vibration from the engine, i thoug maybe my trasmition mount but it too is in good conditon

[Steve Crowe]

No SES? "Some vibration"

Can we try to localize that? I'll bet one mount is not 100% so let's keep your engine out of it for the moment.

[9T8W66]

I'll bet it's one of the Motor mounts.