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Spark Plugs for a 1932?


scott12180

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What is a good modern spark plug that I can use on a 1932 Standard Eight Packard?

References I have call for original equipment A-C type K-9 or K-7.

This nomenclature is not currently available. Any recommendations on modern equivalent?

--Scott

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Assuming your car still has the original cylinder head (31 and earlier used either 18mm or 7/8 thread size), Autolite recommends a 308, I've used these for years in nearly all the Packard Eights with 14mm plugs. If you're using the original high tension wires ending in the eyelets and fastened with knurled thumbnuts, use a 303 which I believe still comes with a threaded top post, the knurled thumbscrews are readily available.

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According to my old sparkplug chart AC K series sparkplug is a 14mm by 3/8? reach and is in the middle of the sparkplug heat range. K14 being at the hottest part of the range and K-5 being at the coolest part of the heat range the others being K-5, K-7, K-9, K-10, K-11, K-12 and K-14. These sparkplugs were used in many GM and others engines until the change was made by AC to the newer and still used AC 4 series which merely means that it is a 14mm and no ?R? means no resistor. A #5 after the number ?4? means it is the #5 heat range. AC 414 means it is a 14 mm by # 14 heat range.

AC SPARKPLUG SPECIFICATION CHART

PASSENGER CARS-1926-1942

PACKARD ONLY

Thru 1929-Turbo Head.....78

1930 Turbo Head.............86

All thru 1931-Reg. Head...78S

1932..............................46

1933-34-35-36................45

1937-38.........................103S

1939-40-41-42...............106

Yours, M.L. Anderson

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<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">All thru 1931-Reg. Head...78S

</div></div> Would this be a 18mm or 7/8 thread size?

I asked because that is the size I have in my car and was running Champions.

Thanks

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This is timely. Last night I decided to remove the spark plug wire holder and repaint it. Doing some research, I found that I had incorrect clip on wires. I'm running AC 45s in my car with the clip on wires. This morning I ordered AC's with the correct threaded top and knurled knobs from Bruce Blevins 810-744-1820 (Michigan). I bought a set of plug wires with the correct eyelet on the end from Cole Ignition 585-342-9613(New York). Amazing what a simple project can morph into <img src="http://forums.aaca.org/images/graemlins/tongue.gif" alt="" />

I actually have a NOS set of the original AC K7s that were spec in the car. I haven't decided to put them into the car yet.

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Thru 1929-Turbo Head.....78 (7's are 7/8")

1930 Turbo Head.............86 (8's are 18mm)

All thru 1931-Reg. Head...78S

1932..............................46 (4's are 14mm)

1933-34-35-36................45

1937-38.........................103S (1's are 10mm)

1939-40-41-42...............106

Somewhere on the Internet is an AC explanation chart but I have lost it's address.

M.L. Anderson

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What is a "Turbo head"?

The sheet that I have packed away in the event that I move (???) is not quickly available at this time and I don't believe that it had any expanation about this item. My guess would be that it was a cylinder head with squish and quench configuration as this was being used at this time. However this is a guess!!!

Yours, M.L. Anderson J

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<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">Can you let us know how the parts look once you receive them? </div></div>

Received the spark plugs and knurled knobs. They look great.

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  • 2 weeks later...

<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">Can you let us know how the parts look once you receive them? </div></div>

Received the spark plugs and knurled knobs. They look great. </div></div>

I received the spark plug wires from Cole Ignition. Look good with what I assume is the correct ends and wire finish...shiny black.

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