The coil is only a couple of years old. Relatively new ballast resistor. With the pertronix I had to run almost 20 on the timing, took it out, went down to 12 and it runs good, the whole system is better without the Pertronix.

       

Gary, 55 Vicky, St. Germain, Wisconsin

 

It is not your RV cam. You say that taking out the pertronix and putting the points back in makes your car start much faster. Have you considered that your carb problem MAY be electrical in nature? How is the engine block grounded to the frame? Try a jumper wire from the plus side of battery to the coil to eliminate the ignition switch. CAUTION NO NEUTAL SAFETY SWITHCH PROTECTION aginst starting in gear!!!! How old is the coil and are you using a ballast resistor sinch you replaced the pertronix. So many more questions to answer. Good luck Pete

It's the Fordo, I've been speedshifting these things since the early 60's, but even just a normal slow takeoff sucks. It idles great now, sounds good on the highway, just boggy. Would the RV cam have anything to do with it?

       

Gary, 55 Vicky, St. Germain, Wisconsin

 

55 Vicky:

You haven't mentioned what trans you are running, but if it's the original Fordomatic, are you aware that it normally takes off in 2nd gear?  That makes for sluggish acceleration.  Try putting the shift lever in Lo and trying it.  Should be a big improvement in take off.

John

John - "The Hoosier Hurricane"

Good shot of gas as soon as I hit it, but still stumbled. Got it at 12 degrees and ported vaccuum, I'll cruise a bit and see how it's acting.

       

Gary, 55 Vicky, St. Germain, Wisconsin

 

It's a new carb, doesn't mean it can't be bad. Ever since I took the Pertronix out it's starting and running better than ever. Just touching the key starts it, just doggie on acceleration. With the Pertronix I was almost at 20 btdc, now I'm at 12 and it's running good, not as much vaccuum as I'd like but I'll keep tweaking.

       

Gary, 55 Vicky, St. Germain, Wisconsin

 

Ted's absolutely correct about the accel pump, But again, if the timing is set somewhat retarded, and you are using manifold vacuum, as soon as you crack the throttle, the distributor retards the timing. You'll have a serious flat spot or stumble. However, first, check the pump with the engine off. Remove the aircleaner and operate the throttle lever. You should have a pump shot almost as soon as you move the linkage. I would not do this running, if it back fires you'll lose your eyebrows. Also don't do it more than once or twice, you'll flood the engine and it'll be difficult to start.

Frank/Rebop

Bristol, In ( by Elkhart) 

couldnt a sloppy throttle shaft also cause this problem?

letting in too much air?

i doubt the pertronix unit is at fault.

when was the last time carb was rebuilt?


This ain't no L-Kamino!

I seriously doubt that the secondaries are trying to open right off of idle regardless of the secondary spring being used.  If you have a later model 4150 or 4160 Holley (you haven’t clarified exactly which carb yet), then the accelerator pump system is at the top of the list of items to check.  At full throttle, there should only be about 0.015-0.020” of additional movement or play before bottoming out the accelerator pump diaphragm.  Any more than this will just require adjusting the spring loaded screw and nut that’s the transition between moving parts and reducing the amount of clearance.  Also related to this is any present free play or looseness in the accelerator pump linkage at idle as this will be a stumble or dead spot whenever throttle opening is initially applied.  But all adjustments for this system are performed with the throttle arm in the full throttle position.

Lorena, Texas (South of Waco)

It's at 12, also my best vaccuum & at ported vaccuum. Still a terrible stumble when I take off. They just oiled the road and put down little pebbles so it'll be a couple days before I take it out for a good test cruise. I might be changing the secondary spring, I think it's opening to soon.

       

Gary, 55 Vicky, St. Germain, Wisconsin