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WC - Spark Plugs

T

Tom RS

Member
On my 1937 WC I have J8C plugs.
In the manual I have, it calls for J8 plugs.
Is there a big difference?
I'm hoping there is actually because its hard to start when hot or warm and is a crank start only.
 
The C may make it a resister plug and if it has a mag which it most likely should have then yep could be your problem. Only way to make sure is check your spark when warm first off and make sure it is a blue/white and jumps a 1/4 inch gap or more. I would also check about a little bit hotter plug due to this poor gas we have now days and also check which one of the auto lite brand would be a swap since the champ plug any more are not all that good
 
I know everyone has there preferences but I refuse to buy the Champions any more because of all the grief they have caused me on customers tractors. Autolite plugs have become my brand of choice. I always feel better when I throw the champions as far as I can.
 
I"d like to try a hotter plug. How do I know what number plug to get or is this a question for the NAPA folks?
 
On champion plugs most of the time if you have say a J8 if you go with say a J10 that is hotter. As with the auto lite if you have say a 286 and then go to say a 437 that is hotter. Auto lite uses a bigger number system then champ does
 
If you can go with the auto lite brand of plug since the champions now days do not work well with the gas they have out.
 
I've had great success with Autolite 295 plugs in all of our B, C, & WC magneto fired tractors. Was running Autolite 303 plugs in a WC with distributor conversion. Tuned it up last week for a pull and the only plugs that I had were some 295s. This tractor has never run better!! Kip
 
When a champion spark plug has a "C" at the end of the code, it means that it has a "Copper Plus" electrode. This is just a more durable electrode and does not otherwise change the plug. Thus, a J8C is the modern J8. However, champion has had some quality control problems with some recent batches of their new chinese-made plugs. Supposedly, the insulators are sub-standard and can conduct too much if they are exposed to lots of oil or fuel (for example, old tractors with improperly set carbrators and bad oil rings). I put some older J8C plugs in my Case SC and am having no problems.
 
How long have Champions been made in China. My current stock of plugs is about 15 years old and would like to know if I need to get rid of them. I haven't had any problems with Champions in the past.
 
The way I understand it the champ plugs have gone to the land of almost right in the last 10 or so years but not sure which year it was
 
I saw a couple of videos and pictures of plugs being made in China. They were basically handmade and tested on homemade equipment or on something that was made in the 30's or 40's. Really low tech.
 
I checked my spark plug boxes (i saved the old plugs in the new boxes) and the ones from the plugs in my SC are marked "...1992...made in USA," and I have had no problems.
The major quality control spills that I have heard about seem to have happened within the last ten years. There seem to have been two issues. One was a problem with the insulators fouling quickly, and another was a problem with the insulators breaking inside the plug and then sliding down to touch the ground electrode. These problems were reported to happen to almost all of the plugs in a set of new plugs, not just to one in a set. If you have plugs with these problems, then you will know it very quickly.
However, most of the complaints that I have either heard about or read are consistency problems, such as poor performance/life of one plug in a set or badly bent/gapped electrodes.
I would suggest that you just use what you have, and only junk them if you have major problems.
 
I keep most if not all of my used plugs and have been known to clean them and then use them when I need a plug for something like a tractor I haul in that has plugs that are broken or so rusty they can not work
 
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