whistling when warmed up
Posted: Sat Mar 03, 2018 5:00 pm
Figured I would bounce this around for the experts:
I have a vacuum leak when the 230 flat head six warms up. There is a constant high pitched whistling (sucking sound) near the front of the engine (carb side). I have used the usual starting fluid to try to find this leak, no luck with increased rpm. The carb was rebuilt and mating surfaces planed on a lapping plate until flat. Lots of time to get them flat. I know these carbs, the ETW1 are famous for warping and having vacuum leaks. The carb is not the issue. If a lifter side cover or the fuel pump gasket are at fault, this would lead to a constant whistling vacuum leak? Also, if there is a crack in the front tube of the intake manifold I would have this also. The vehicle's engine is worn. Cylinders run 95-100 psi on compression test. Also, the vacuum measured at the intake manifold plug when idling is about 14" of vacuum. Reading this forum, guys with the 251 flat head six experience 18"-22" vacuum, engine in good condition. I figured a 230 flat head six should be about 16"-20"?
Has anyone experienced a vacuum leak on a side cover or fuel pump with whistling? With the PVC sucking additional crankcase air into the carb intake due to a side cover leak, it would lead to a lean fuel mixture and poor running engine & dying under load. Your thoughts?
I have a vacuum leak when the 230 flat head six warms up. There is a constant high pitched whistling (sucking sound) near the front of the engine (carb side). I have used the usual starting fluid to try to find this leak, no luck with increased rpm. The carb was rebuilt and mating surfaces planed on a lapping plate until flat. Lots of time to get them flat. I know these carbs, the ETW1 are famous for warping and having vacuum leaks. The carb is not the issue. If a lifter side cover or the fuel pump gasket are at fault, this would lead to a constant whistling vacuum leak? Also, if there is a crack in the front tube of the intake manifold I would have this also. The vehicle's engine is worn. Cylinders run 95-100 psi on compression test. Also, the vacuum measured at the intake manifold plug when idling is about 14" of vacuum. Reading this forum, guys with the 251 flat head six experience 18"-22" vacuum, engine in good condition. I figured a 230 flat head six should be about 16"-20"?
Has anyone experienced a vacuum leak on a side cover or fuel pump with whistling? With the PVC sucking additional crankcase air into the carb intake due to a side cover leak, it would lead to a lean fuel mixture and poor running engine & dying under load. Your thoughts?