I need to change the subject of my original thread a bit...
93 LX 66k original
Just installed B cam, GT40X aluminum heads, intake, 1.6 roller rockers, roller lifters
On a cold motor:
1=158
2=155
3=150
4=140
5=120
6=130
7=130
8=unknown
If cylinders 1-4 (passenger side) is reading an average of 151, and cylinders 5-8 are reading an average of 127, then what can cause this?
I have read that low compression amongst all cylinders issues, and I had gas in the oil and exhaust that we figured were from timing and a hung injector.
But, I have also read that not degreeing a cam can cause one side to be lower than the other. Evidently if the cam is a few degrees off, even though you have the marks lined up nose to nose on the crank and cam, they can still be a bit off. I guess the theory is that the valves either open or shut too early on the low compression side.
Let me iterate that all cylinders are withing 25% of each other which is fine by the Haynes manual, but not by me. I have 58cc combustion chambers on these new aluminum heads so this car should be pushing more than 127 average on one side right?
Key notes:
1) The car supposedly had a head gasket blow on the low compression side years ago
2) The cam and the crank were positioned nose to nose
3) Battery is really low
I have not finished shimming the rocker arms, but would that affect compression on just one side? None of them were shimmed when I did the test.
93 LX 66k original
Just installed B cam, GT40X aluminum heads, intake, 1.6 roller rockers, roller lifters
On a cold motor:
1=158
2=155
3=150
4=140
5=120
6=130
7=130
8=unknown
If cylinders 1-4 (passenger side) is reading an average of 151, and cylinders 5-8 are reading an average of 127, then what can cause this?
I have read that low compression amongst all cylinders issues, and I had gas in the oil and exhaust that we figured were from timing and a hung injector.
But, I have also read that not degreeing a cam can cause one side to be lower than the other. Evidently if the cam is a few degrees off, even though you have the marks lined up nose to nose on the crank and cam, they can still be a bit off. I guess the theory is that the valves either open or shut too early on the low compression side.
Let me iterate that all cylinders are withing 25% of each other which is fine by the Haynes manual, but not by me. I have 58cc combustion chambers on these new aluminum heads so this car should be pushing more than 127 average on one side right?
Key notes:
1) The car supposedly had a head gasket blow on the low compression side years ago
2) The cam and the crank were positioned nose to nose
3) Battery is really low
I have not finished shimming the rocker arms, but would that affect compression on just one side? None of them were shimmed when I did the test.