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coil on plug
#1
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sanddoc
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OK, not really a Packard topic, but
My mine has been thinking of this, and
I have found no answer or anyone who could
answer this, so I'll give you guys a chance.

In todays new cards, they have coil near plug
and coil on plug (Ford) and others.

The computer and a trigger on the crank usually
run this setup

But what is this not possible for an older car

install Coil on plug or Coil near plug (your choice0
Then run the 12v coil wire to the High Tension lead
and let it run 12v dc down the "old spark plug wires
to the new coil setup". if this works we can then
makeup some regular 12/14g wire and run them from
the distributor to the COP.
What is wrong with this setup??
yes I know we would get rid of the 7 or 8 mm plug wires.

Posted on: 2021/9/30 21:56
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Re: coil on plug
#2
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HH56
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I believe one issue you will run into is the rotor tip in the distributor does not actually touch the plug terminals -- just the center terminal from the coil -- but rather the high voltage jumps a tiny gap to reach the plug terminals which 12v would not be able to do.

Posted on: 2021/9/30 22:49
Howard
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Re: coil on plug
#3
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sanddoc
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sounds right. So any idea on how to remedy
that?
I'm just kicking this around. but like most
things, they just start with an idea, thought.

Maybe a roller tip on the end of the rotor
and a flush contacts in the cap so there would
be a direct contact

So if that could be overcome, do you think it
would fire the COP?

what is interesting when I think of these COP
ignition, in truth they are 100 years old
the old vibrator box,
so maybe should look at them for a start..
oh well , just another idea..
Best

Posted on: 2021/10/1 6:43
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Re: coil on plug
#4
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Fish'n Jim
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It depends what car your retrofitting.
If it can take a HEI type distributor, with the magnetic point pickups, it doesn't care how you fire the plugs. It evolved that way, first close coupled coil, then remoted. Most of these won't fit your typical points jalopy otheriwse, it's just a matter of how it's triggered, wired, and supported.
Not sure what you're trying to gain here? If it's low compression, HEI isn't much benefit. Much ado about nada. It gets harder to spark as the gas charge pressure increases. Spark energy somewhat affects % combustion.
Most "normal" people would swop out the motor for a modern one as described/desired but that's how innovations happen. Someone has a pet idea and eventually comes across a solution whether it fits the original issue or not.
You could fit the new timing pickup to the crank, but would take some fancy redo.
Go back to the good old magneto and your problems are solved.

Posted on: 2021/10/1 10:24
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Re: coil on plug
#5
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DavidPackard
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A low tension ignition system was developed for piston power aircraft years ago. See article

https://www.aircraftsystemstech.com/p/low-tensionmagneto-system-high-tension.html

The only parts we don't have access to are the 'brushed' distributor cap, and a low tension coil.

Typically low tension systems are only needed at high altitude . . . not sea level, so not sure there would be an automotive application to forage for parts.

dp

Posted on: 2021/10/1 12:10
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