Phil Robson
Well-Known Member
Hi All,
My V8 is running a bit rough again. Between 1000 & 1500 rpm it has a rough (unbalanced) note to it, above that it is OK & it idles well.
I've run the car (10.5:1 engine) on standard unleaded for 30,000 miles of (hardish) driving and the only similar problem I've had is with the carbs which were sorted about a year ago.
I did a compression test yesterday. The range was 138 to 150 psi (6 pots were between 138 & 142). The only test that was done 30,000 miles ago was a leakage test & the range was 26-40%. Does anyone know a correlation between the two?
The book says 175 +/- 15psi for a high compression engine.
I still think it may be a fuel problem as the car still goes like the proverbial above 1500 rpm. Any ideas?
Thanks,
Phil (East Yorks RO)
My V8 is running a bit rough again. Between 1000 & 1500 rpm it has a rough (unbalanced) note to it, above that it is OK & it idles well.
I've run the car (10.5:1 engine) on standard unleaded for 30,000 miles of (hardish) driving and the only similar problem I've had is with the carbs which were sorted about a year ago.
I did a compression test yesterday. The range was 138 to 150 psi (6 pots were between 138 & 142). The only test that was done 30,000 miles ago was a leakage test & the range was 26-40%. Does anyone know a correlation between the two?
The book says 175 +/- 15psi for a high compression engine.
I still think it may be a fuel problem as the car still goes like the proverbial above 1500 rpm. Any ideas?
Thanks,
Phil (East Yorks RO)