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Iron D-Port Heads All iron d-port heads, flow number and performance results

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Old 05-10-15, 12:23AM   #16
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Last time I went to get NGK'S at the parts store it was one of those WTF moments with a new kid at the counter punching god knows what into the computer. Finally get 2 boxes of 4 to find out that someone put the wrong plugs in the wrong box.
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Old 08-15-15, 05:17PM   #17
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I want to use all Accel plugs. Can anyone tell me where to find a listing of which would be appropriate for Pontiac heads both big and small socket size and the different ones available for heat range, electrode style etc. that can still be found.?
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Old 08-16-15, 11:03AM   #18
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Found Jim Hand article on spark plugs ... short and sweet

He recommends ..

AC 45S crosses to Accel 0137 for 1971 or earlier heads

AC R45TS crosses to Accel 0274,0576,0576S 72 up

-appears to be a difference in the depth of the electrode from plug seat, assume this is just a matter of how the plug holes were factory machined and not a difference in combustion chamber location. Different thread and socket size to minimize confusion. Big plug-little plug ... never really knew all the differences.
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Old 08-16-15, 11:31AM   #19
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May have been great with the gasoline back then.
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Old 08-16-15, 02:34PM   #20
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Seems like the crux of the biscuit in plugs is thread and reach for mechanical fit anyways. 71 and back are big plug 13/16 socket 14mm thread with .375 reach and 72 up are small plug 5/8 socket with 14mm thread and .460 reach. From there heat range variables make plugs appropriate for a certain application. Wanted to get several sets of plugs and possibly have them cryo'd with my r/a's but have some difficulty with the heat range variables ... doesnt seem to be much info available on this. My race motor may be an E-85 motor, would like to have it at the CR that is most beneficial to E-85 IE 12-13 : 1. The right plug to light it off and work well there.
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Old 09-03-15, 02:38PM   #21
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Quote:
Originally Posted by keith View Post
Found Jim Hand article on spark plugs ... short and sweet

He recommends ..

AC 45S crosses to Accel 0137 for 1971 or earlier heads

AC R45TS crosses to Accel 0274,0576,0576S 72 up

-appears to be a difference in the depth of the electrode from plug seat, assume this is just a matter of how the plug holes were factory machined and not a difference in combustion chamber location. Different thread and socket size to minimize confusion. Big plug-little plug ... never really knew all the differences.

problem- the AC plugs don't protrude as much from the shell, and tend to run colder than a Champion, Autolite, Motorcraft, NGK

and the AC plugs will tend to then foul easier.

if you want a really good plug for a street Pontiac, get a vintage Bosch plug.

they are a work of art.
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Old 09-05-15, 12:17AM   #22
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Well I will probably always be fiddling with my Pontiac powered mobiles one way or another. For now I will just stick with the yellow jackets since I like them as long as they are available to fit ... have one of those spark plug blasters to instantly clean like new.
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Old 02-17-16, 09:40AM   #23
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blasting the tips of plugs, makes them foul almost instantly later
because it gives the carbon a nice, rough, bare "tooth" to grab on to
just like blasting a car fender then painting it, the paint sticks really good then

a better, easier way is- soak the plugs overnight in a solution
10% hydrochloric acid/90% water
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Old 02-19-16, 11:31AM   #24
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Think I have 2 or 3 sets of old timers, never really used for long periods, electrodes and center conductors still intact. Might try your solution based cleaning and see if I can polish to very smooth finish with a dremel tool polisher after. Were the old plugs "plated" with some coating metal or just machined from the base metal? Wondered about blasting a set and then solder-coating conducting surfaces and possibly limiting area on electrode for spark impact with high temp paint so all spark energy travels to a smaller area possibly intensifying it, keeping it hotter and less prone to carbon deposit.
Is there a way of making a test setup so this can be monitored visually and possibly with a voltmeter/ammeter? 12v battery-drill press to lock distributor shaft in-coil to be used-msd unit-coil wires-drill apiece of flat stock to accept 8 plugs. Make a complete circuit. Test almost complete igniton system out of the car. I happen to have a storage oscilloscope so I could actually monitor multi-spark action at high rpm I think. Make a little test box with glass sides maybe. "Ignition tuning box". Another one of those maybes
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Old 01-16-19, 07:00AM   #25
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best domestic USA made spark plug for a vintage street Pontiac mill,
is a UJ18Y Champion, if you can find them
cuz they have an auxiliary gap in the wire end, inside the porcelain
a second gap that makes the spark jump twice, once inside,
and once at the tip.
the end result is a hotter spark from the coil, they resist fouling.
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Old 01-16-19, 09:23PM   #26
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R44s had them.in the engine for 2 years, just put in a new set 1 months ago.
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