What exactly is this Champion Ford #7 ,1/2"Pipe Thread ,extra long reach ,dual exectrode spark plug ?

[FireDan]

After searching the forum and online I still do not know what this is for or why it was made .It is a Champion Ford #7 ,1/2" Pipe thread , extra long reach ,dual exectrode spark plug ? It is similar to a #34 but having the Ford name on it with such a long reach has got me stumped. #7 Champions are not usually 1/2" Pipe, though I did see a #7 Champion Which is basically a Champion X from Early on . The reach of this plug , along with the number and being marked FORD and being 1/2" pipe , along with the Dual electrode has me a bit baffled . Any Ideas ???

[FireDan]

[John kuehn]

Try this collector. https://www.e3sparkplugs.com/blog/meet- ... ordinaire/

He has an Emil address and he may can identify that plug.

[Kerry]

Looks like a good fit if your T has an aftermarket compression whistle fitted.

[TXGOAT2]

Many similar plugs of various brands were widely used in large, single cylinder stationary gas engines such as were commonly used in oil fields and for powering factories and mills. If it's Ford-specific, would it be used in a Fordson tractor?

[Wayne Sheldon]

I am really surprised it would have the Ford name on it! Similar plugs were commonly used on many types of stationary industrial and agricultural engines for many years. I am not familiar enough with the earlier two cylinder Fords, maybe they wanted a longer reach plug? If that were the case, why would a much later replacement be marked that way?
The style of the insulator indicates it should be from the 1920s or 1930s. Except for the number "7" and the "Ford", I would wonder if a standard replacement insulator was extended and replaced into the long reach base? However, all things considered, I doubt that would be the case.

Metz used long reach plugs for several years. My remains of a 1914 model 22 had them. There were a few other cars used them also.

[TXGOAT2]

Big T-head engines might need a long reach plug. Low compression, huge chamber volume...

[FireDan]

Looks like a good fit if your T has an aftermarket compression whistle fitted.

Exactly why I bought it ..... I am making an adapter out of a 1/2 x 1/2 x 1/8 Pipe Tee...........

[FireDan]

Many similar plugs of various brands were widely used in large, single cylinder stationary gas engines such as were commonly used in oil fields and for powering factories and mills. If it's Ford-specific, would it be used in a Fordson tractor?

Seems to be too long for the Fordson: the Fordson plug was the extended reach Champion X which became Standard for all Model T's , as far as I know . It really looks like a #34 , but the "FORD" stamp on it has me baffled.

[FireDan]

Try this collector. https://www.e3sparkplugs.com/blog/meet- ... ordinaire/

He has an Emil address and he may can identify that plug.

Thanks John, I sent him an email .......

[FireDan]

I am really surprised it would have the Ford name on it! Similar plugs were commonly used on many types of stationary industrial and agricultural engines for many years. I am not familiar enough with the earlier two cylinder Fords, maybe they wanted a longer reach plug? If that were the case, why would a much later replacement be marked that way?
The style of the insulator indicates it should be from the 1920s or 1930s. Except for the number "7" and the "Ford", I would wonder if a standard replacement insulator was extended and replaced into the long reach base? However, all things considered, I doubt that would be the case.

Metz used long reach plugs for several years. My remains of a 1914 model 22 had them. There were a few other cars used them also.

You were thinking what I was thinking Wayne, but as it is not the early take apart kind , pretty hard to extend that electrode ..... maybe it was a plug made up at the factory using the wrong insulator ? I wonder if they made a special plug for Henry's airplane he was developing ? Hope i can figure it out , I won't use it in my Spark plug whistle adapter till i do , I'll just use a NOS / Semi-used #34 take apart I bought.

[FireDan]

Big T-head engines might need a long reach plug. Low compression, huge chamber volume...

My 1937 City of San Diego Seagrave was the second to the last ( Serial Number 85805 ) made with the 1915 Seagrave T-head , I do not remember it having 1/2 pipe thread plugs.....if it did , there were 3 plugs per cylinder , 2 each off of a 12 terminal distributor, and 1 from a magneto, and a gold mine of pipe thread plugs. I think it had 7/8-18 or 18mm, its been a long time since I sold it after my friend Chuck Waugaman from SPAAMFFAA in Watsonville passed away and I lost my cheap storage . That thing had cylinders like coffee cans ...... Sometimes I wish I had kept it ..... it was still residing in Watsonville last time I knew , because I sold it to 2 guys from there.

[Matt in California]

Did someone put a Ford electrode in a reach plug?

Matt

[FireDan]

Did someone put a Ford electrode in a reach plug?

Matt

Not sure : I don't think Ford Electrodes came this long.... I will post pictures when I get it in my hot hands and take it apart.

[ThreePedalTapDancer]

That looks like a Champion 34 with the Ford 7 top.

[ThreePedalTapDancer]

Aren’t Metz plugs long reach like that?

[ModelT46]

Someone once told me or I read it somewhere, that such a plug was used in an engine that was using too much oil.

[TXGOAT2]

If it didn't hit the piston or a valve, it would increase compression a little and might reduce detonation on very low octane gas. As far as I know, Ford did not make or recommend any exotic plugs for the Model T. I don't think the dual electrodes do much for performance. The high voltage will fire whichever one is the easiest path, and likely would not fire both unless some kind of "hot coil" was in use. Multiple electrodes were often used in stationary engine applications that ran all the time, the idea being that as one electrode wore away to the point of misfiring, the other one would begin firing, thus avoiding a shut down for plug service. I'd guess that a mechanic would set a dual electrode plug for an application with a recommended plug gap of .025 with one electrode gapped to .024 and the other gapped at .026.

[FireDan]

Aren’t Metz plugs long reach like that?

Metz plugs are #32 and longer even than this one or a #34

[FireDan]

If it didn't hit the piston or a valve, it would increase compression a little and might reduce detonation on very low octane gas. As far as I know, Ford did not make or recommend any exotic plugs for the Model T. I don't think the dual electrodes do much for performance. The high voltage will fire whichever one is the easiest path, and likely would not fire both unless some kind of "hot coil" was in use. Multiple electrodes were often used in stationary engine applications that ran all the time, the idea being that as one electrode wore away to the point of misfiring, the other one would begin firing, thus avoiding a shut down for plug service. I'd guess that a mechanic would set a dual electrode plug for an application with a recommended plug gap of .025 with one electrode gapped to .024 and the other gapped at .026.

Someone here posted a long time ago that Ford #7 was the original Champion number for Champion X plugs and I did see an early add for replacement plugs that listed a "Champion 7" for the Model T : the add was long before "Model A" version 2........ still does not explain this weird plug.

That sounds like it would work gapping them like that .... I'll be using mine in an explosion whistle adapter I am making ...

[FireDan]

Someone once told me or I read it somewhere, that such a plug was used in an engine that was using too much oil.

There is another version of the regular long reach Champion X that has two electrodes : It is a Champion #33