Re: Missing at 3,000 rpm
"Big Al" <email@example.com> wrote in message
> "Joe" <firstname.lastname@example.org> wrote in message
>>I have a 1972 Ford Mustang, 351C-4v. It has an Edelbrock Performer
>> Intake, and Edelbrock Performer 750cfm carb, with vacuum secondaries.
>> I just swapped the stock dizzy, with a MSD pro-billet (magnetic
>> pickups), MSD-6A CD ignition and a Pertronix Flamethrower II coil. I
>> also installed new Autolite plugs and NAPA sparkplug wires.
>> I have the dizzy curved to have all advance come in at about 2,800. It
>> is timed for 16 degress initial, with 25 certifugal, for 41 total
>> degrees at about 2,800 RPM. The dizzy also has a vacuum advance, which
>> is hooked up just above the butterfly plates in the carb.
>> The car idles beautifully (much better than it ever did). However, at
>> about 3,000 RPM (cruising), it is missing pretty badly. There is no
>> knock or pinging though, and I know that 41 degrees total advance is a
>> lot. Any recommendations for what's causing the missing? What could I
>> do? Should I back off the initial advance to about 13 degrees, so I
>> total out at 38 degrees?
> Don't think the miss is due to timing, but:) It's way too high for a
> driven car, especially if it's "all in" at 2,800 RPM. I would disconnect
> vacuum advance and drop the timing down to about 36 degrees total and see
> the miss goes away. Then you will have a better idea where to start.
> Al # 35
Sorry about the triple post. Tried to send it and it wasn't going, so I
tried some more. It went:)
Al # 35