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Old 10-10-2005, 09:01   #1 (permalink)
Joe
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Missing at 3,000 rpm

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?

Thanx...

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Old 10-10-2005, 09:01   #2 (permalink)
Joe
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Re: Missing at 3,000 rpm

As an update - the engine is in good health. Vacuum stays steady (at
idle) of about 16 inches. No water in the oil when replaced. Spark
plugs run clean.

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Old 10-10-2005, 09:01   #3 (permalink)
Big Al
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Re: Missing at 3,000 rpm


"Joe" <lanser1996@joltmail.net> wrote in message
news:1128952117.818061.270960@f14g2000cwb.googlegroups.com...
>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?
>
> Thanx...
>


Don't think the miss is due to timing, but:) It's way too high for a street
driven car, especially if it's "all in" at 2,800 RPM. I would disconnect the
vacuum advance and drop the timing down to about 36 degrees total and see if
the miss goes away. Then you will have a better idea where to start.

Al # 35

Al


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Old 10-10-2005, 09:01   #4 (permalink)
Big Al
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Posts: n/a
Re: Missing at 3,000 rpm


"Joe" <lanser1996@joltmail.net> wrote in message
news:1128952117.818061.270960@f14g2000cwb.googlegroups.com...
>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?
>
> Thanx...
>


Don't think the miss is due to timing, but:) It's way too high for a street
driven car, especially if it's "all in" at 2,800 RPM. I would disconnect the
vacuum advance and drop the timing down to about 36 degrees total and see if
the miss goes away. Then you will have a better idea where to start.

Al # 35

Al



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Old 10-10-2005, 09:01   #5 (permalink)
Big Al
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Posts: n/a
Re: Missing at 3,000 rpm


"Joe" <lanser1996@joltmail.net> wrote in message
news:1128952117.818061.270960@f14g2000cwb.googlegroups.com...
>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?
>
> Thanx...
>


Don't think the miss is due to timing, but:) It's way too high for a street
driven car, especially if it's "all in" at 2,800 RPM. I would disconnect the
vacuum advance and drop the timing down to about 36 degrees total and see if
the miss goes away. Then you will have a better idea where to start.

Al # 35

Al



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Old 10-10-2005, 16:01   #6 (permalink)
Big Al
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Posts: n/a
Re: Missing at 3,000 rpm


"Big Al" <nospamsal1@qwest.net> wrote in message
news:YKv2f.11$5r6.905@news.uswest.net...
>
> "Joe" <lanser1996@joltmail.net> wrote in message
> news:1128952117.818061.270960@f14g2000cwb.googlegroups.com...
>>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?
>>
>> Thanx...
>>

>
> Don't think the miss is due to timing, but:) It's way too high for a
> street
> driven car, especially if it's "all in" at 2,800 RPM. I would disconnect
> the
> vacuum advance and drop the timing down to about 36 degrees total and see
> if
> 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


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Old 10-10-2005, 22:01   #7 (permalink)
David M
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Posts: n/a
Re: Missing at 3,000 rpm

On Mon, 10 Oct 2005 06:48:37 -0700, Joe rearranged some electrons to form:

> 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?
>
> Thanx...


Seems like a lot of advance, and probably too much initial timing.
How is the MSD power connected (directly to the battery as the
instructions tell you) or otherwise? That box uses a lot of energy at
higher RPMs. Make sure your alt. is good, too (above 13.5V), and
make sure you have a solid ground connection for the MSD box.
Also make sure you have the magnetic trigger connected properly.
http://www.msdignition.com/downld1.htm

--
David M (dmacchiarolo)
http://home.triad.rr.com/redsled
T/S 53
sled351 Linux 2.4.18-14 has been up 1 day 6:40

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Old 10-11-2005, 07:01   #8 (permalink)
Joe
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Re: Missing at 3,000 rpm

The MSD power cable is connected directly to the battery. I checked
operation of the alternator, and it's pumping out at least 13.5 V at
higher rpms.

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Old 10-11-2005, 07:01   #9 (permalink)
Joe
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Posts: n/a
Re: Missing at 3,000 rpm

The MSD power cable is connected directly to the battery. I checked
operation of the alternator, and it's pumping out at least 13.5 V at
higher rpms.

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Old 10-11-2005, 19:01   #10 (permalink)
Big Al
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Re: Missing at 3,000 rpm


"Joe" <lanser1996@joltmail.net> wrote in message
news:1129037947.213408.295430@g49g2000cwa.googlegroups.com...
> The MSD power cable is connected directly to the battery. I checked
> operation of the alternator, and it's pumping out at least 13.5 V at
> higher rpms.
>


MSD's are designed to run with low battery voltage. They do just fine on
cars without alternators.

Al # 35


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