Blade

#6 which is messing up all the spark plugs I trow at it (they get covered in oil) has about 120 PSI while the rest are 150. What does that mean ? Rings or head gaskets ? :/

------------------
92 Z28 L98 350
---------------
Ported and polished heads, ported stock TPI base, ported plenum, Comp Cams XR270HR-10 cam (lift .495/.502 duration 218/224 lobe separation 110), Edelbrock TES headers, LT4 valve springs, Crane AFPR, Flowmaster catback with LT1 style tips, MSD coil & wires...

"Take that auto, drop it in first, hold the brakes, stomp the gas and grin from ear to ear! :-)

[This message has been edited by Blade (edited July 29, 2000).]

ede

squirt some oil in it and if it goes up the rings are leaking if not the leak is around the valve. if the head gasket leaked between cylinders you'd have low readings on the 2 with the leak.

------------------

ICON Motorsports

[This message has been edited by ede (edited July 29, 2000).]

Blade

Cool... I'll try that! Thanx

------------------
92 Z28 L98 350
---------------
Ported and polished heads, ported stock TPI base, ported plenum, Comp Cams XR270HR-10 cam (lift .495/.502 duration 218/224 lobe separation 110), Edelbrock TES headers, LT4 valve springs, Crane AFPR, Flowmaster catback with LT1 style tips, MSD coil & wires...

"Take that auto, drop it in first, hold the brakes, stomp the gas and grin from ear to ear! :-)

Tim Burgess

Also, for repeatability & accuracy, the throttle plate should be @ WOT during the compression test, otherwise the pressure readings will be lower.

My 305 has readings in the 170 - 180 psig range.

The rule of thumb is:
max psi * 0.7 = min psi allowed


Tim

Blade

Damn this is gonna be hard! It's difficult enough that I have to crawl under the car, fight with the guage to screw into the spark plug hole, hold it with one hand while I'm wedging a screwdriver between the wires in the starter to get it to turn over while I got all sorts of **** falling down in my eyes. LOL

I plan on putting oil in there (somehow!) and see if the readings change and then do a leakdown test. God I hope I dont have to pull the engine again... it was a PITA last time I did it.

------------------
92 Z28 L98 350
---------------
Ported and polished heads, ported stock TPI base, ported plenum, Comp Cams XR270HR-10 cam (lift .495/.502 duration 218/224 lobe separation 110), Edelbrock TES headers, LT4 valve springs, Crane AFPR, Flowmaster catback with LT1 style tips, MSD coil & wires...

"Take that auto, drop it in first, hold the brakes, stomp the gas and grin from ear to ear! :-)