Spark Plugs for the Driver T

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ModelTWoods
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Spark Plugs for the Driver T

Post by ModelTWoods » Mon May 13, 2024 4:46 pm

What's everybody's personal experience with Autolite 3095 spark plugs for a "Driver" T ? What's your experience if you've ever used Older Firestone E-40-F plugs in your T ? Also Champion A25's ? (not the take apart type).


TXGOAT2
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Re: Spark Plugs for the Driver T

Post by TXGOAT2 » Mon May 13, 2024 6:10 pm

I'm using Champion A-25s and get good results. Engine is near stock and has good oil control. Ignition is stock except for a New Day Timer.


John kuehn
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Re: Spark Plugs for the Driver T

Post by John kuehn » Mon May 13, 2024 6:46 pm

Motorcraft Model T spark plugs are a good aftermarket plug. They work fine.


KBurket
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Re: Spark Plugs for the Driver T

Post by KBurket » Mon May 13, 2024 11:04 pm

I use Autolite 3095 plugs.
I drive between six and ten miles once a week exercising low gear up a long hill on one of my regular routes.
I’ve had plugs go bad on me so I change them once a year and clean them pretty regularly.
My motor is currently using a distributor.
I like that I can find them in a few of the auto parts in my area.

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DaveBarker
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Re: Spark Plugs for the Driver T

Post by DaveBarker » Tue May 14, 2024 8:49 am

I've been using the Champion A25 (aka 525) plugs with good results and no problems. Rajo head, Stromberg RF carb, bored 0.030".
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Spark Plug 1.jpg

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Re: Spark Plugs for the Driver T

Post by Steve Jelf » Tue May 14, 2024 9:53 am

I've used 3095 because they are the least expensive new plugs for a Model T. The local O'Reilly's can have them for me the next day. I don't expect them to last decades like some plugs. That may happen, but I've had a few fail in a year or two.Their advantage over original plugs is that they don't come apart in use like Champion X, Splitdorf, and other old timers. I do use original-type plugs, but I always carry spares. It's not a bad idea to do the same with modern plugs.
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Re: Spark Plugs for the Driver T

Post by John kuehn » Wed May 15, 2024 7:21 pm

I just found a set of 3095 plugs I bought at Chickasha a few years ago. When I read this post I thought I had some somewhere. The older guy I got them from had them on his table and he couldn’t sell them. Brand new in the boxes for a dollar each. He told me they weren’t original and I was the first that asked about them. He came down on the price .50 each and they were mine for a dollar each! I guess times have changed!


signsup
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Re: Spark Plugs for the Driver T

Post by signsup » Thu May 16, 2024 10:55 am

I know nothing about these air gap plugs other than a stash of them came in a Model T parts lot, so I presume the PO was running them. I have not installed them in my T but may do so to test them. NOS Champion
champion 1.JPG
6 com 62. What little verbage I can find them is they are commercial plugs designed for engines that run hot, a cooler running plug.
I've got a little roughness in my T engine right now and connecting everything up after gas tank cleaning and lining. If it still runs a little rough, I'll replace the plugs with something and see if that helps. Then I'll move to the coils.

Anyone heard of these AC plugs?
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Re: Spark Plugs for the Driver T

Post by TRDxB2 » Thu May 16, 2024 12:30 pm

From the internet for AC 6-COM-62 plugs

6COM-62, 18mm plugs were listed as for "Ford and pre 1926 Harley." by spark plug dealer Donald McKinsey in 1994
from a discussion on aaca.org
My pre-war Champion catalog shows this 18mm plug as mainly intended for commercial vehicles and motorcycles. It's a "severe service" plug and is recommended for engines that run hot. (It's a colder type plug.) There were no specific vehicle recommendations in the catalog but there is a note that it can be used in some Studebakers, but it is indicated as a plug that can be used to help correct rapid gap growth, pre-ignition, ping, overheating and core fracture caused by hot running motors, high speed usage, heavy loads and long highway upgrades in hot climates.
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6com62.png
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RajoRacer
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Re: Spark Plugs for the Driver T

Post by RajoRacer » Thu May 16, 2024 12:31 pm

If that's a gasket on there - it won't fit a T - they're 1/2 pipe !


speedytinc
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Re: Spark Plugs for the Driver T

Post by speedytinc » Thu May 16, 2024 12:34 pm

RajoRacer wrote:
Thu May 16, 2024 12:31 pm
If that's a gasket on there - it won't fit a T - they're 1/2 pipe !
18MM is not the same as 1/2" pipe thread.


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Re: Spark Plugs for the Driver T

Post by signsup » Thu May 16, 2024 1:17 pm

Would a early Ford and Harley plug really be 18mm? I haven't tried to thread one in yet, but certainly don't want to mess up a head.
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TRDxB2
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Re: Spark Plugs for the Driver T

Post by TRDxB2 » Thu May 16, 2024 3:13 pm

signsup wrote:
Thu May 16, 2024 1:17 pm
Would a early Ford and Harley plug really be 18mm? I haven't tried to thread one in yet, but certainly don't want to mess up a head.
Good question. All depends on what one means by "Early"
Spark Plug (18mm Champion);
1933-37 Ford V8
1929-1952 Harley-Davidson WL
1936-1940 Harley-Davidson EL
1937-1947 Harley-Davidson UL
1941-1947 Harley-Davidson FL
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Re: Spark Plugs for the Driver T

Post by Steve Jelf » Thu May 16, 2024 4:31 pm

I believe Model T spark plugs were always half inch pipe thread, from the beginning. I don't know about all the pre-T models. The Model T parts dealers have adapters that let you use other sizes.
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