What Is The Added Height For Under The Spark-plugs?

KCTractors · Feb 4, 2017

Just acquired this 8N and it has these things under the spark-plugs. They add about an inch to the plugs. There was Champion H-10 plugs in it. I took them out and put the plugs back in and the tractor runs the same. What are they supposed to do?

JMOR · Feb 4, 2017

anti-foulers. Generally used in a major oil burner to run the plugs hotter than Hades to help keep them from getting oil fouled.

544hydro · Feb 4, 2017

I think they are spark plug anti foulers

Richard G. · Feb 4, 2017

Back in the old days, folks would put a 1/2 inch pipe elbow in a Model T spark plug hole and put the plug in the other end to prevent oil fouling.
Richard with a 1917 Model T

Royse · Feb 4, 2017

"Back in the old days, folks would put a 1/2 inch pipe elbow in a Model T spark plug hole"

Richard G, this has my curiosity up. I'm familiar with the pictured
anti-foulers, used to run them in my 225 slant six Dodge.
But I've never worked on an engine that had pipe threads for the
spark plugs. What type of plugs were those? Did they re-thread
the holes to make the elbows work or possibly just force them?
I can't fathom forcing them sealing very well.

tractorguy2 · Feb 4, 2017

I have one brand new spark plug for a model T. It has pipe threads. My dad has several boxes of old plugs from the 30's. At least
two boxes of IH plugs for F-20's. I'm pretty sure he has a box ofnew plugs for a model A Ford.

Bob · Feb 4, 2017

Spark plugs were pipe thread back then, always wondered how and when they became METRIC, way before most other things in the US did.
Replacements on the Brillman site

Royse · Feb 4, 2017

Thanks for the link Bob. Before my time apparently.
However, the Brillman company is not before my time.
I've purchased from them many times.
They have a lot of parts not available any where else.
They are a great company to deal with.
I highly recommend them but suggest doing it over the phone
until they get their website purchasing process secured.

Dean · Feb 4, 2017

Others have told you what they are.

They do work and are hard to find these days.

Keep them.

Dean

Robert Zack · Feb 5, 2017

I still have a few of those .........somewhere. dorman still makes them

Tim PloughNman Daley RIP · Feb 5, 2017

Spark plugs always were metric. They were invented in Germany by a guy named Bosch, hence the metric threads. Our Ford N-Series tractors use the 14mm x 1.25mm (thread pitch) plug. Specs called for the Champion H-10 plug. Later, Champion released a hotter plug, the H-12, sold today under the number 512. Then Auto-Lite released their 437 plug which is about the same as the H-12 and both are better than the H-10 plug.

[i:654c4848f0][b:654c4848f0]<font size="4">Tim *PloughNman* Daley(MI)</font>[/b:654c4848f0][/i:654c4848f0]<table width="100" border="1" cellpadding="0" cellspacing="0" bordercolor="#000000"><tr><td height="25" colspan="2" bgcolor="#CC0000">

</td></tr><tr><td>

</td><td>

</td></tr></table>

ASEguy · Feb 5, 2017

Tim mentioned down below the "hotter" plug. If you remove the foulers, and to prevent future oil fouling on the plugs, some techs would run a hotter plug from the same manufacturer and not run the foulers. I think with Autolite if you were to go up one number, you go up one heat range which means the plug runs hotter to burn off the deposits. You have to be careful here and not just run up to a very high heat range because to much heat can remain and the you can cause pre-ignition which leads to detonation which can cause extensive engine damage. Spark plugs essentially serve two purposes; to ignite the mixture and to remove some heat from the combustion chamber.

ASEguy · Feb 5, 2017

Sorry Tim, My reply was meant for KC tractors.

Bruce (VA) · Feb 5, 2017

Model T engines are indeed 1/2" NPT. Pipe thread. And Model T owners these days argue over using adaptors for new metric threaded plugs VS the OEM pipe threaded plugs.

Model A's plugs are 7/8 NS (national standard) threads. Again, not metric. I haven't been around an early Ford V-8 in 40 years, but IIRC, they went to metric plugs/threads like the rest of the world in 1937 or 38.

Just guess here......but it would have been typical of Henry to take a patented item like a spark plug with metric threads, put pipe threads on it & claim it was not patent infringement. Allegedly, that's what he did when he took a basic negative ground Kettering ignition system, switched it to positive ground on the A Model and didn't have to pay Kettering royalties.

Yea, that's a good story & might even be true!

Richard G. · Feb 5, 2017

Model T plugs were 1/2 inch pipe thread. they tightened down just fine. No need for the metal gaskets like on modern plugs. My 1912 Fairbanks-Morse Eclipse engine also has 1/2 pipe thread plug hole. Many old engines used them.
As did over 15 million Model T's.
Last photo shows 4 types.
3 on left are Champion and 1 on right is Auto-Lite.
Richard

HFJ · Feb 5, 2017

[b:78a5ad0de8]"Yea, that's a good story & might even be true!"[/b:78a5ad0de8]

:lol:

a good story beats facts on most days

Bob · Feb 5, 2017

"Spark plugs always were metric."

WHY would you say that, when hundreds of thousands of 1/2" and 3/4" pipe thread sparkplugs were made in the early part of the last century, and were the most common type used (at least in the USA) in all types of engines from one-cylinder open-flywhee engines to car engines to tractor or boat engines?

Tim PloughNman Daley RIP · Feb 9, 2017

I thought we were talking about Ford Tractors here. For the record, yes Model T's used a 1/2 pipe thread spark plug and the later 4 bangers, '28-'34 used a 7/8" pipe thread sparkie. Ford used the 14 mm Champion H-10 (or equivalent) from the N-Series Tractors up thru the Hundred Series models. Ferguson TO-20 and TO-30 models used Champion #8 spark plugs with 18mm threads. Ironic how the Ford Tractor threads were metric yet the hex AF (Across Flats) dimension was in INCH format. I.E H-10 = 14mm x 1,25mm with 13/16" AF dimension. Was this the beginning of what we now have on our cars and trucks whereby we need a 1/2" SAE wrench along with a 12mm wrench when we work on them??? The whole metric system that Jimmy Carter tried to get the USA to convert too never quite panned out. Detroit Big 3 companies only did it to compete with the wily Japanese and Germans. I know, I was in manufacturing for 37 years. Started to see drawings in metric. Even old parts got redrawn with metric dimensions...stupid.

Tim

JMOR · Feb 9, 2017

(quoted from post at 13:15:16 02/05/17)
[b:574785060e]"Yea, that's a good story & might even be true!"[/b:574785060e]

:lol:

a good story beats facts on most days

xcept that from 1932 through 1938, Lincoln was Negative ground. Then Positive gnd through 1955, after which reverted to Negative again. Ford bought Lincoln Motor company in 1922.

What Is The Added Height For Under The Spark-plugs?

KCTractors

Member

JMOR

Well-known Member

544hydro

Member

Richard G.

Well-known Member

Royse

Well-known Member

tractorguy2

Well-known Member

Bob

Well-known Member

Royse

Well-known Member

Dean

Well-known Member

Robert Zack

Member

Tim PloughNman Daley RIP

Well-known Member

ASEguy

Well-known Member

ASEguy

Well-known Member

Bruce (VA)

Well-known Member

Richard G.

Well-known Member

HFJ

Well-known Member

Bob

Well-known Member

Tim PloughNman Daley RIP

Well-known Member

JMOR

Well-known Member

Similar threads