Champion H10C, or something different ?

[Doug-F1]

What is the reason some say Champion H10C are not a good plug I have them in my 52 8RT seems to get the job done. That said I have no idea if a different plug would be better or not. Just asking

[Kube]

Originally Posted by Doug-F1

What is the reason some say Champion H10C are not a good plug I have them in my 52 8RT seems to get the job done. That said I have no idea if a different plug would be better or not. Just asking

I have installed them in a number of "drivers" and never once was there a performance issue.

[keith oh]

Same here, I have never had a problem in my flatheads using C 10C plugs.

[Vic Piano]

I used Champion H-10's for a long time however, one time, (I think it was in the late '70's), I bought eight H-10's for my '53 Ford but, when I opened the boxes, five out of the eight plugs were missing electrodes... I believe Champion had been sold to an off-shore company, and it didn't appear that the quality control unit was part of the sale... After that, I switched to Autolite 216's and I've been using them, with no problems for over 30 years.

[ford38v8]

I've always used Champion H10C, and have changed them out for new several times only because I thought they deserved a break!

[scooder]

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I'm sure it's down to engine spec. H10's work great by most accounts on stock engines, a good number of modified flatheads however like a hotter plug it seems.
The NGK equivalent of the champion H10 will more often than not work great in the engines that will foul an H10 in short order, and would refuse to work after cleaning. The NGK equivalent stayed clean.
Why the NGK works better in this scenario, I don't know, but it does.
I can only guess that the NGK equivalent is actually a hotter plug than the H10.
This experience led me to believe that the H10 was a rubbish plug. I now sit here older, uglier but hopefully a bit wiser than I was. So my opinion has changed about the champion H10. It works great in a stock engine. If it's modified, you may need a hotter champion plug.
Martin.

[Bassman/NZ]

My heads have been reworked for 45 thou clearance over the pistons, and H10s and B6Ls foul up. Tried some H12s and they work fine.

[49r]

H10's for over 40 years - no issues.

[35fordtn]

I have also always ran Champion H10's with no issues on 3 cars. I recently swapped to Autolite 216's Same perfomormance, only swapped as over time the champions started to get surface rust on the bases.

[Ol' Ron]

To my knowledge the H10's have a cut thread, where as others have a rolled thread. However it's best to use Never sieze on all plugs especially in aluminum heads. For those using electronic ignition, using large plug gaps will affect the cap and rotor as the higher voltage may cause cross firing.

[Tim Ayers]

Originally Posted by Ol' Ron

To my knowledge the H10's have a cut thread, where as others have a rolled thread. However it's best to use Never sieze on all plugs especially in aluminum heads. For those using electronic ignition, using large plug gaps will affect the cap and rotor as the higher voltage may cause cross firing.

Is one type of thread better than another?

[Mike51Merc]

Just take a new H10 (you can find them in the lawnmower parts section of your local hardware store) and visually compare it to an Autolite 216 or an NGK B6L. There's a noticeable difference in quality. If you don't believe that looks count, then go ahead and run the H10s.

[Kube]

Originally Posted by Mike51Merc

Just take a new H10 (you can find them in the lawnmower parts section of your local hardware store) and visually compare it to an Autolite 216 or an NGK B6L. There's a noticeable difference in quality. If you don't believe that looks count, then go ahead and run the H10s.

I am not defending one plug over another as I have never been privy to the respective company's certifications.
However, I do know I have NEVER had an issue with Champion plugs in any engine. And, apparently neither has anyone that has weighed in here thus far.
Still, in the interest of learning might you enlighten us as to how you are apparently able, by a visual inspection, to detect why the Champion plug is inferior to others?

[Doug-F1]

This is great information,I didn't expect such a debate. Im thinking I might try the NGK plugs and see if I can tell if there is a difference. It's the first time in the 28 years I have had my 52 F-1 that I will use other than Champion plugs. Sometimes change is good, so we'll see.

[scooder]

Originally Posted by Tim Ayers

Is one type of thread better than another?

A cut thread has a greater chance of sticking in an aluminium head. Rolled thread not as much, use never seize on threads goin into aluminium heads is wise.
Martin.

[adileo]

Odd ball here w motocraft up till now never gave it much thought. Do I have cut or rolled - bad or good plug

[Bassman/NZ]

Sort of related... I tried Autolite 216 plugs, and 4 of them cracked after about 20 miles. Back to the Champions....

[flathead 53]

go with the h 10 s or autolite 216s ,it seams these are the most used, check your plugs ,are they fouled ,or carboned up?

[Mike51Merc]

Originally Posted by Kube

I am not defending one plug over another as I have never been privy to the respective company's certifications.
However, I do know I have NEVER had an issue with Champion plugs in any engine. And, apparently neither has anyone that has weighed in here thus far.
Still, in the interest of learning might you enlighten us as to how you are apparently able, by a visual inspection, to detect why the Champion plug is inferior to others?

It may be totally subjective and hard to describe in writing on an internet forum, but try it and see. The fit, the finish, the threads, the knurling. To me, the Champs just seem, I don't know, I guess CHEEPY. Not that there's anything wrong with that. Go ahead and run 'em.

[Graeme / New Zealand]

had H10s in mine one went bad replaced all with NGK B6L and never looked back.

GB