I have a 59 283 230hp car that is rough at idle below 800rpm. The vacuum guage jumps from 14psi to 15psi at idle. I was told it was probably a bad valve. The car does not smoke at all and runs out perfect above 800rpm.
I ran both a compression and a leak down test on the car and even double checked it. The numbers are as follows
Cylinder#----------Compression------------Leak Down %
1-----------------------------140 ----------------------11%
2-----------------------------145 ----------------------12%
5-----------------------------145 ----------------------10%
7-----------------------------145 ----------------------13%
2-----------------------------110 ----------------------11%
4-----------------------------140 -----------------------9%
6-----------------------------145 ----------------------11%
8-----------------------------140 ----------------------10%
The # 2 cyclinder is down to 110 psi on compression and at 11% leak down. I can not understand why the compression is down with only 11% leak down.
The spark plug wear is very consistant over the 8 cyclinders with the exception of a little less wear on the number 2 plug.
I also did a wet test on cylinder # 2 and the compression remained the same. This tells me the the rings are not failing.
Any help on this would be greatly appreciated.
Regards,
Steve
I ran both a compression and a leak down test on the car and even double checked it. The numbers are as follows
Cylinder#----------Compression------------Leak Down %
1-----------------------------140 ----------------------11%
2-----------------------------145 ----------------------12%
5-----------------------------145 ----------------------10%
7-----------------------------145 ----------------------13%
2-----------------------------110 ----------------------11%
4-----------------------------140 -----------------------9%
6-----------------------------145 ----------------------11%
8-----------------------------140 ----------------------10%
The # 2 cyclinder is down to 110 psi on compression and at 11% leak down. I can not understand why the compression is down with only 11% leak down.
The spark plug wear is very consistant over the 8 cyclinders with the exception of a little less wear on the number 2 plug.
I also did a wet test on cylinder # 2 and the compression remained the same. This tells me the the rings are not failing.
Any help on this would be greatly appreciated.
Regards,
Steve
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