penguininatux

Alright, heres the story. so i was boosting fine for a while, but a vaccuum line to the FMU was kinked so i was running lean for a while no engine can withstand long periods of a lean a/f ratio.. anyways blew 2 ringlands so i threw in new pistons and rings, but now am not gettin very much compression consistantly in all 4 cyl. The pistons and rings are the right for the application, and valve timing is right. and new head gasket. And im pretty sure its not a stuck valve or non sealing valve because the low compression is in all 4 cyl.. That's why i thought the timing was off, but i've checked it multiple times. I did hone out the cylinder bore also. Anyways.. if you guys know any tests i can run or have any ideas that would be great.. Thanks.

oh and heres a pic of one of the worst cylinders.... all i can say is.. RAPE.

penguininatux

OHH And trust me.. im buying new management as soon as i get it running.

90dx

What are your compression numbers?Have you broke it in already?

Guy-Fast

headgasket

penguininatux

it has not been broken in.. it hasnt started yet because of this problem.. compression is ilke 10 or 20 in all 4 cylinders.

and to chris... is tehre any tests i can run to check the headgasket? again.. the compression is low in all 4 cylinders. There is no pressure coming out the exhaust or intake, and the timing is right, so i've kind of eliminated the valve timing as an issue. And it has the same amount of air coming out the oil cap hole as a running 5sfe engine. I checked. So its not the rings. could a headgasket remove most of the compression from all cyl?? is that likely? Anyways.. Let me know.. Thanks for the feedback so far!

88dx

10 or 20 psi? Did you do anywork to the head? Adjust the valves?

Guy-Fast

Headgasket is very good possibilty for poor #'s accross the board.leakdown. valve adjustment also

penguininatux

no valve work.. just cleaned some.. But im pretty sure valves are seating correctly.

Any tests though chris? There are also no bubbles in the radiator when the car is turned over just to let you know..

Thanks againl.

88dx

Do a Leak down Test. How dose it run with only 20psi in all 4

penguininatux

and i was talkinga bout tests without leakdown eqipment.. but i guess i'lll have to borrow some or buy some.. anyways.. in the meantime any more feedback would be tite..