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I have an addiction

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Mark W. View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mark W. Quote  Post ReplyReply Direct Link To This Post Topic: I have an addiction
    Posted: 18 July 2021 at 12:02pm
I have mentioned a couple times in the past that the plugs I will be using in CHUG are UJ-8 Champion booster gap plugs. The original application was for dual fuel tractors. They have a gap up inside that causes the ignition spark to be much hotter as the coil must create a higher voltage to jump two gaps.

That said for the last half dozen years or so I have been buying almost everyone of these plugs that shows up on eBay.

I just bought another 11 of them. For a grand total of 108 plugs including the ones in CHUG right now. Average price has been around $3.25 each so about .40 cents more each then a J8 at NAPA.

So I have on hand 26 changes. If I run say 5,000 miles on a set of plugs I'm good for the next 130,000 miles 

I think I need to stop buying these things.
Chug A Lug
1948 2A Body Customized
1949 3A W/S
1957 CJ5 Frame Modified
Late 50's 134L 9.25"clutch T90A D18 (1.25") D44/30 flanged E-Locker D25 5.38 Since 1962
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Fred46 Quote  Post ReplyReply Direct Link To This Post Posted: 19 July 2021 at 11:04am
Is there an advantage or reason for using UJ8 plug vs. J8 in our Willys engines?
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Mark W. View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mark W. Quote  Post ReplyReply Direct Link To This Post Posted: 19 July 2021 at 11:24am
yes hotter spark
Chug A Lug
1948 2A Body Customized
1949 3A W/S
1957 CJ5 Frame Modified
Late 50's 134L 9.25"clutch T90A D18 (1.25") D44/30 flanged E-Locker D25 5.38 Since 1962
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Oldpappy Quote  Post ReplyReply Direct Link To This Post Posted: 19 July 2021 at 11:46am
Is your engine the stock L134, or something with higher compression?

A hotter spark plug is not always an advantage, so I am curious as to your reason for using them. 

A stock L134 in good condition runs great with the heat range of the J8 plugs. A worn engine sometimes needs a hotter spark to prevent fouling, but from what I have seen of your Jeep I doubt you have that issue. 




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Mark W. View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mark W. Quote  Post ReplyReply Direct Link To This Post Posted: 19 July 2021 at 7:40pm
Oldpappy the heat range in the same between a UJ-8 and a J-8 what is hotter is the SPARK jumping the gap MORE VOLTS. Yes my 134L has higher compression though its only 7.2-1

A coil only produces the voltage required to jump a given gap. With a Booster Gap plug like the UJ-8 it has to produce enough voltage to jump both gaps. As a result the SPARK IS HOTTER more spark.

I also have my spark plugs indexed so the opening of the electrodes points towards the center of the Piston. Again just a little thing.

Does this make me 2 more HP no does it make even 1 I doubt it. But I learned a long time ago while street racing for money against cars with much bigger engines and cubic dollars more. When you do all the little things it adds up.


Edited by Mark W. - 19 July 2021 at 7:42pm
Chug A Lug
1948 2A Body Customized
1949 3A W/S
1957 CJ5 Frame Modified
Late 50's 134L 9.25"clutch T90A D18 (1.25") D44/30 flanged E-Locker D25 5.38 Since 1962
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Oldpappy Quote  Post ReplyReply Direct Link To This Post Posted: 20 July 2021 at 11:22am
Hmm...,

I am thinking this may be a good idea after all. These engines were designed to run on leaded gasoline, which is not what we are running today. A hotter spark may cause it to run cleaner. 
If you can't get there in a Jeep you don't need to be there
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ron D Quote  Post ReplyReply Direct Link To This Post Posted: 21 July 2021 at 11:29pm
Not sure the same battery and coil can produce any more voltage than it's normal capacity? Still trying to figure out the "hot" relationship to "voltage".... more voltage = hotter? Can it be measured?

This is the best description I came across for booster plugs. https://firetrucksandequipment.tpub.com/TM-5-4210-230-14P-1/css/TM-5-4210-230-14P-1_615.htm

Seems like a solution searching for a problem with a jeep motor? Especially one that otherwise runs good? The up side is with having bought 108 you might have cornered the market......wait until the demand surges and you can name your price!

I like it! And I'm not going to mention my collection of..........LOL





Edited by Ron D - 21 July 2021 at 11:40pm
1951 M38
1951 M100
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Mark W. View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mark W. Quote  Post ReplyReply Direct Link To This Post Posted: 21 July 2021 at 11:45pm
The coil produces the voltage required to complete the circuit. The battery has nothing to do with it as long as the system voltage is maintained. In my case the Petronix coil I have is rated for 40,000 volts. It can produce a spark of up to that voltage.





Edited by Mark W. - 21 July 2021 at 11:55pm
Chug A Lug
1948 2A Body Customized
1949 3A W/S
1957 CJ5 Frame Modified
Late 50's 134L 9.25"clutch T90A D18 (1.25") D44/30 flanged E-Locker D25 5.38 Since 1962
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ron D Quote  Post ReplyReply Direct Link To This Post Posted: 22 July 2021 at 12:59am
Ok Mark, if you say so. In my experience with electricity, high voltage components operate to their maximum designed electrical potential (using the word potential strictly in the electrical sense), only limited by protection devices like fuses and circuit breakers. If a coil is rated at 40kv then it puts out pretty near 40kv every time. Have I measured it? No.

Having a spark plug with not one but two gaps to bridge seems redundant and another point of failure? You can look at the electrode on the end of a regular plug and see if it's fouled or needs to be gapped or replaced.......can that be done for the internal electrode? How would you even know if it was fouled or worn out? Test it under load?

I'm not an engineer, so am probably missing that booster plugs must serve a real purpose for specific  engines operating under specific conditions. Seems to me they must be pretty special or a lot more motors would have them? Never heard of benefit using them on the L134 before. It's interesting. How many miles do you have on them?


Edited by Ron D - 22 July 2021 at 1:01am
1951 M38
1951 M100
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bruce W Quote  Post ReplyReply Direct Link To This Post Posted: 22 July 2021 at 1:31am
Originally posted by Oldpappy Oldpappy wrote:

Hmm...,

 These engines were designed to run on leaded gasoline, which is not what we are running today. 

  Actually, they were not. As you know, this engine design pre-dates World War Two, and lead wasn’t added to gasoline until the advent of the horsepower wars of the ‘50s. 
BW 
Happy Trails! Good-bye, Good Luck, and May the Good Lord Take a Likin' to You!

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Michaeltru Quote  Post ReplyReply Direct Link To This Post Posted: 22 July 2021 at 1:56am
Lead was added to gasoline starting in the ‘20s to raise octane levels.  It helped to cushion the blows of the valves hitting the non-hardened valve seats. Lead helped lubricate the valve stems.  I think that’s what I learned about early ford Flathead V-8s
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mark W. Quote  Post ReplyReply Direct Link To This Post Posted: 22 July 2021 at 9:20am
In a 134L I have 45 miles in other engines I have near 20,000. What I know about the ignition system as used in our engines I learned on the farm and in college as an automotive tech major in the early 80's when this was still the most common type of ignition.

I'm not trying to convince anyone to run a Booster gap style plug. Just telling you I am and discussing the addiction I have had to buying them to secure my supply of a type of plug discontinued long ago.

As to how would I know if the internal points were fouled that's simple there's nothing to foul the internal points they're not exposed to fuel or oil.
Chug A Lug
1948 2A Body Customized
1949 3A W/S
1957 CJ5 Frame Modified
Late 50's 134L 9.25"clutch T90A D18 (1.25") D44/30 flanged E-Locker D25 5.38 Since 1962
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bruce W Quote  Post ReplyReply Direct Link To This Post Posted: 22 July 2021 at 10:46am
Originally posted by Michaeltru Michaeltru wrote:

Lead was added to gasoline starting in the ‘20s to raise octane levels.  It helped to cushion the blows of the valves hitting the non-hardened valve seats. Lead helped lubricate the valve stems.  I think that’s what I learned about early ford Flathead V-8s

 Embarrassed Well, there I go, like so many others, repeating what I’ve heard and want to believe without actually knowing the facts. I checked and now I know different. Thanks for the push. BW 
Happy Trails! Good-bye, Good Luck, and May the Good Lord Take a Likin' to You!

We Have Miles to Jeep, Before We Sleep.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mark W. Quote  Post ReplyReply Direct Link To This Post Posted: 22 July 2021 at 11:33am
high octane fuel came to be as a result of air racing and the need for faster mitary aircraft
Chug A Lug
1948 2A Body Customized
1949 3A W/S
1957 CJ5 Frame Modified
Late 50's 134L 9.25"clutch T90A D18 (1.25") D44/30 flanged E-Locker D25 5.38 Since 1962
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Post Options Post Options   Thanks (0) Thanks(0)   Quote athawk11 Quote  Post ReplyReply Direct Link To This Post Posted: 22 July 2021 at 1:25pm
If the UJ8 plug offers an advantage over the standard options, then why were they discontinued?  Seems counterintuitive.
1- 1946 CJ2A   
2- 1949 CJ3A
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mark W. Quote  Post ReplyReply Direct Link To This Post Posted: 22 July 2021 at 3:21pm
It is my understanding the original application was for dual fuel tractors. As the market has changed since the 40's and 50' and dual fuel tractors are no longer being produced Champion made the decision to discontinue the plugs in the early 80'S last time I bought them new from NAPA.
Chug A Lug
1948 2A Body Customized
1949 3A W/S
1957 CJ5 Frame Modified
Late 50's 134L 9.25"clutch T90A D18 (1.25") D44/30 flanged E-Locker D25 5.38 Since 1962
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