Any one know what a Built 3.5 compression psi would be per cylinder?

96sleepergle · 08-09-2009, 06:53 PM

Do any one know what the exact numbers should be on a built vq 3.5 bored out .020 over stock (3.6) liters with 9.0:1 wiseo pistons , did a compression test and got 175-180 psi from cylinders 1-3-5 and 160-165 from 2-4-6 getting mixed numbers when searching

**nismology** · 08-09-2009, 07:06 PM

The numbers from bank to bank should be pretty consistent. There seems to be a 20PSI max variance with your setup and that is excessive per the FSM. Either there's a head gasket breach all along the front cylinder bank or the cam timing is off (more likely of the two).

96sleepergle · 08-10-2009, 10:29 AM

Quote:

Originally Posted by nismology

The numbers from bank to bank should be pretty consistent. There seems to be a 20PSI max variance with your setup and that is excessive per the FSM. Either there's a head gasket breach all along the front cylinder bank or the cam timing is off (more likely of the two).

Yep your right was discussing it with my brother theres no oil spitting outof the breather filter nor smoke but it seems to be off sequence when you listen to it idling never thought of the cam timing being off but thats what it sounds like your the man nismology tilley built this motor there were aot of F+++ked things he did so we will be pulling this motor to fix all his screw up