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Antique Engine Archives All archived posts from 1999 to 2004 when SmokStak was on EnginAds. This is a read-only board.

Antique Engine Archives

Spark plug ?

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Old 05-23-2004, 12:57:01 AM
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Default Spark plug ?

Are there any old manuals or a web site for older spark plugs? I picked-up a box full of old plugs and would like to know what they are for. The 1/2" pipe plugs are for the gas engines and there are some 3/4" pipe plugs in there also. There was also a 1/2" plug with a primer on the side of it in there. Does anyone know what this is from? Thanks, Jason
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Old 05-23-2004, 01:04:51 AM
Byron Roberts
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Default Re: Spark plug ?

Jason :: You see primer plugs on E-bay you might check there they seem to be pricy it all depends on what it is..Byron
Old 05-23-2004, 09:42:57 AM
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Default Re: Spark plug ?

Without a catalog, it would be hard to tell what each plug actually went too. While most one cylinder engines used 1/2 inch pipe tread, there where many other companies in the early part of last century that used them also. Lots of car companies and tractor companies, motorcycles, boat motors, trucks, generators, airplanes, and industial engines we hardley ever hear of these days used them. I believe the model T fords used a 7/8 pipe tread plug.
Old 05-23-2004, 12:44:33 PM
Tom G
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Default Re: Spark plug ?

Model T Fords used a 1/2 inch pipe thread spark plug. Model A Fords used a 7/8 straight spark plug.

My Standard Monarch garden tractor uses a 1/2 inch pipe thread plug. So does the model 92, single cylinder Maytag engine.

The priming cup was a gimmick used by some of the spark plug companies. Just something to make their plugs a little different.
Old 05-23-2004, 07:31:54 PM
Ken Majeski
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Default Re: Spark plug ?

The 3/4 tapered thread pipe plugs were used on the Titan 10 - 20 Tractor and also on the 15 - 30 Titan tractor, That is the one with the crossmount horisontal engine. Not the common Modern upright version.... They are hard to find today...
Old 05-23-2004, 08:21:03 PM
John Davidson
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Default Re: Spark plug ?

The priming spark plug was not a "gimmick". It was to aid in starting, especially in cold weather. 1/2" priming plug were mainly used in Model T Fords. They did not have primers built into the heads like say Dodge's. Most early old cars had updraft carburators and you had to crank them to start. It was hard to crank them fast enough to pull up a charge of vaporised gas. With the priming plug you opened the priming cup on the side of the plug, put a little gas in, close the priming cup and crank it over. If you had good spark, it started and with the speed of the engine the gas would draw up and keep going. The primer on a spark plug is no different than priming a big engine with a little gas before pulling it over.

As someone said, T Fords were the greatest users of 1/2" pipe thread spark plugs. I have a 13 Overland that uses 1/2" and there were a few others. The very early big gas tractors used 3/4" pipe thread plugs. I have a board of over 30 kinds of 3/4" plugs in my collection. They are large and very interesting.
Old 05-24-2004, 01:39:19 AM
Andrew Mackey
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Default Re: Spark plug ?

try contacting The Spark Plug Collecters of America (SPCOA), it is a club that collects spark plugs Andrew

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