I don't really believe the brand has much to do with it.

It's more dependent on getting the mixture right, a properly serviced air cleaner, fresh gas, having a healthy engine, a working thermostat, and good spark from a fully functioning distributor.

Get all that right, then fine tune for the proper heat range.

Start with the recommended application of your favorite brand. If it's a working tractor, that should be the one that works best.

If it gets worked hard, under powered for what it is used for, then colder plugs will be better.

If the tractor sees little work, lots of starting and idling, rarely up to operating temp, burning a little oil, it will need hotter plugs.

It's a matter of trial and error to get them just right.
 
I have been satisfied with autolite 3116
Non resistor plugs
Give good service
But I believe they are made off shore now, so many of you will not use them
 
My self I have been switching to NGK plugs due to the auto lite not holding up like they once did.
 
Brand does matter and doesn't. The issue you run into is that one brand calls for a certain heat range plug in an engine and another brand calls for a different heat range. I can go into all kinds of stories on plugs and what I have found. The average run of the mill engine will run nicely on Autolite. The old Chryslers run on Champions. Foreign things are either NGK or the Nippendenso. German is Bosch, That is before we get into Platinum, dual tip platinum, silver, gold or irridium. Then there is the new plug that is waiting to get to the market that has no electrode. Basically, it never wears out.
Old tractors, stick with Autolites or even AC. Champs will run but you might desire to bump up a heat range, maybe two.
If that oil burner just won't keep a plug in it, you can run the standard plug and an anti-fouler. I have heard of anti-fouler coupled with hotter plugs burning holes in pistons. Of course by then, you need an engine anyway and your just prolonging the inevitable with anti-foulers.
 
honestly I do not understand the "resistor" issue. would you mind explaining it ? thanks.

email is open.
 
I run NGK3112 in my Fords and Allis tractor any more. Less fouled plugs and easier starts
 
(quoted from post at 06:41:47 09/18/18) honestly I do not understand the "resistor" issue. would you mind explaining it ? thanks.

They were originally added to cut the static noise in the car radios. All modern vehicles need them to keep the noise out of the computers.
 
I believe the resistor is placed in the plug to cut down on radio and other electronic noise that more modern vehicles might have,

The resistor cuts the volts some, my old Ferguson needs all the voltage it can get,
 
Switched to the ngk. AB-6 (part #2910) and have never looked back , with respect to heat ranges ngk claims 6 to be a ?Hot? plug but not the hottest... their numbers go lower as the heat rises IE: a xx-3 would be hotter than a xx-4 etc.

Out of curiosity I have tried to locate an ngk plug that would be slightly hotter than a 6 for this engine (thread size and reach etc) but with no luck.
 

My 1955 to35 gas had Champion D16 since 2012 and I replaced them with the same plug, adjusted gap to 0.025" with gap tool. Only reason I changed them was to see the condition from previous owner.

This is considered the normal temp plug, as others have said if you need to run a hotter plug because electrode Is melting you have other problems to fix like running mixture too lean.


https://www.tscstores.com/SPARK-PLUG-D16-CHAMPION-P6064.aspx
 

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