bigboi
11-11-2007, 11:27 AM
I have a stumble when I am criusing in 3rd gear starting at 3,000 RPM. When I am in 3rd gear at around 2,500-2,600RPM it's smooth and consistent.
I have a Holley 650 Double Pumper w/ Mechanical Secondaries. It was just rebuilt by The Carb Shop so it should be working good.
One thing I have to deal with is the timing. The previous owner didn't have a white mark on the Harmonic Balancer, but there was a black permanent marker line on the Harmonic Balancer where there is an engraved line by the manufacturer that says TDC. I put a white line on it and put a white line on the timing tab.
When I fire up the engine and hookup the timing light I have to dial the timing light dial to about 40* before the two white lines come together. This seems way high for timing at idle. When I turn the distributor clockwise to retard I can't get it down to around 10* because the engine dies. This must be because the engine timing is being retarded too much. So long story short I don't think the TDC mark on the Harmonic Balancer is correct.
I played with the timing and each time I test drove the car. I got it where "I think" the timing is Ooookay - this is my feeling by listening to it and the throttle response crispness. The exhaust pops when I let off the gas, but I think this is just cold air coming back into the exhaust (I'm running 3" pipes w/ 1 Chamber Flowmasters and they dump at the axle). Acceleration is hard and crisp which is good.
But... I am still wondering why the hell I am stumbling cruising at 3,000 RPM. Could it be that my mechanical secondaries are kicking in at 3,000 RPM? Is this causing it...
Dude... I am at a loss here... Any help is appreciated.
I have a Holley 650 Double Pumper w/ Mechanical Secondaries. It was just rebuilt by The Carb Shop so it should be working good.
One thing I have to deal with is the timing. The previous owner didn't have a white mark on the Harmonic Balancer, but there was a black permanent marker line on the Harmonic Balancer where there is an engraved line by the manufacturer that says TDC. I put a white line on it and put a white line on the timing tab.
When I fire up the engine and hookup the timing light I have to dial the timing light dial to about 40* before the two white lines come together. This seems way high for timing at idle. When I turn the distributor clockwise to retard I can't get it down to around 10* because the engine dies. This must be because the engine timing is being retarded too much. So long story short I don't think the TDC mark on the Harmonic Balancer is correct.
I played with the timing and each time I test drove the car. I got it where "I think" the timing is Ooookay - this is my feeling by listening to it and the throttle response crispness. The exhaust pops when I let off the gas, but I think this is just cold air coming back into the exhaust (I'm running 3" pipes w/ 1 Chamber Flowmasters and they dump at the axle). Acceleration is hard and crisp which is good.
But... I am still wondering why the hell I am stumbling cruising at 3,000 RPM. Could it be that my mechanical secondaries are kicking in at 3,000 RPM? Is this causing it...
Dude... I am at a loss here... Any help is appreciated.