Re: SH D-21 spark plugs

Posted by andy on January 09, 2004 at 21:08:23 from (69.66.64.250):

In Reply to: SH D-21 spark plugs posted by Red Ed on January 07, 2004 at 12:57:00:

The higher the number the hotter the plug with Champions. Doesn't really have much to do with initial starting. It does have everything to do with keeping 1) a cold blooded engine running and 2) keeping a "oil user" engine running. If the plug is too cold it will not burn off the incoming fuel and will foul. I ran a John Deere B across Iowa on a tractor ride a few years ago. In the mornings it would pop and bang and eventually die. In the afternoon when the temp was warmer it would run. After three days of nonsense I finally put the right plug in and it ran like a champ - it was a hotter plug. A couple of years ago my 706 gas basically ate up its oil rings. Tremendous oil consumption. Couldn't keep any plug from fouling. Finally put the Champion 21's in and it would keep going. Looked like a diesel but it did the job I needed it to do until I had time to overhaul it. It seriously could drink a couple of quarts in an hour. The intent with plug heat ranges is to keep the plug tip from eroding while keeping the gas igniting. So, probably the coldest plug for the job which will not foul is what you want. If it fouls .... use a hotter plug. Why not just put hot plugs in anyway? A hotter plug will erode away faster because the tip stays hotter. So, it is sort of like trying to have the longest plug life while not causing fouling problems. I think there is more to it when people say they have Champion plug problems. I do know of more people who bad mouth Champions more than any other plug. But there are those who get along just fine.

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