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SPARK PLUGS

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BIGDOG

05-30-2000 08:06:45




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HAVE BEEN USING CHAMPION H10 SINCE I BOUGHT MY TRACTOR SEVEN YEARS AGO. ONE TIME SEVERAL YEARS AGO THE AUTO PARTS CLERK WAS OUT OF H10 AND GAVE ME A HOTTER PLUG (H12?). THE TRACTOR SEEMED TO HAVE A LITTLE MORE POWER UNDER STRAIN. AFTER THAT I WENT BACK TO MY ORIGINAL H10. I HAVE BEEN READ THAT TO A HOTTER PLUG MAY GIVE ME SLIGHTLY MORE POWER. IS THIS TRUE? ANY SUGGESTIONS, PROS/CONS TO HOTTER PLUGS?
THANKS A MILLION FO ALL YOUR HELP.

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JerryU

05-31-2000 05:06:20




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 Re: SPARK PLUGS in reply to BIGDOG, 05-30-2000 08:06:45  
Heat range is probably one of the most misunderstood property of a spark plug. It refers to how fast the plug transfers heat away from the tip and is accomplished by ceramic to shell design. A "hot" plug retains the heat in the tip giving up less to the head and cooling jacket. These are used when it is necessary to burn off oil because of a worn engine. A "cold" plug transfers the heat more rapidly. If an engine is not an oil burner, you really want to go to a colder plug as it is less prone to carbon foul.

To add to the mix is the creative electrode and insulator design. Extended tip plugs which have a little longer insulator, extend the tip a little further into the combustion chamber and have a very slight effect overall of advancing the ignition timing.

Of paramount importance is proper gapping and keeping the plugs clean.

Whew. Strained my brain on this one.

FWIW

JerryU

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Paul - Pine Island MN

05-30-2000 17:34:04




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 Re: SPARK PLUGS in reply to BIGDOG, 05-30-2000 08:06:45  
Hotter plugs may give some measureable power retention further into their life due to burning off more contaminants, but in most cases there is
so little difference in new plugs in a well tuned engine you probably won't feel anything in the seat of your pants - you are igniting and burning the mixture just about the same. With that said, if the engine isn't well tuned, the design differences may help one plug ignite better than another.
JMO

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MO

05-30-2000 16:59:25




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 Re: SPARK PLUGS in reply to BIGDOG, 05-30-2000 08:06:45  
The local Ford wizard gave me a set of Autolite 437's last time I changed plugs. He told me that they were even a little bit hotter than H12's, and with an old tractor (read needs a rebuild), that it would burn cleaner and have a little more power. Haven't had much chance to try it with a load on it, but it sure did start a lot easier in the winter!



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Jim

05-30-2000 08:20:05




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 Re: SPARK PLUGS in reply to BIGDOG, 05-30-2000 08:06:45  
I just bought some H12 plugs for my '41 9N yesterday. The Champion cross reference book calls for H12. Just to add to the confusion though, I pulled Champion #RJ6C off of the tractor.



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