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Old 04-24-2005, 08:45 PM   #1
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Default Plug heat range question

At our club we are in a spec. class that we are running 20% fuel and the same engine with no moding allowed and the same pipe. I think that it could use some bottom end. I am using the coldest McCoy plug. What would change by putting in a warmer plug?
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Old 04-24-2005, 09:13 PM   #2
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More reliable idle, will clean out better initially, should have more top end power and less initial punch. You can try different exhaust setups, lowering deck height, set clutch so it engages little later, or maybe slight gearing change by changing spur + clutch bell.
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Old 04-24-2005, 10:01 PM   #3
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Very good and comprehensive advise, Sloba.
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Old 04-25-2005, 05:03 AM   #4
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Thanks I will give it a try. I usually ran a cold plug because I was told that they don"t go bad very often. Is that true? Or will most plugs last a long time as long as you don't run the engine to lean?
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Old 04-25-2005, 08:27 AM   #5
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Quote:
Originally posted by THE DOCTOR
Thanks I will give it a try. I usually ran a cold plug because I was told that they don"t go bad very often. Is that true? Or will most plugs last a long time as long as you don't run the engine to lean?
Colder plugs usually have thicker wires. So yes, they tend to last longer.
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Old 04-25-2005, 09:55 AM   #6
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Quote:
Originally posted by THE DOCTOR
I usually ran a cold plug because I was told that they don"t go bad very often. Is that true? Or will most plugs last a long time as long as you don't run the engine to lean?
A cold plug are not always good. When the plug is too cold you may over lean your engine for getting the same power. Then your engine wears faster.
Saw many people just used to choice the coldest plug because they thought it should be the same as real car. The real car tuner rise the compression or add turbo's barometric,so they need to delay the ignition timing.
In my opinion,more hot plug let the ignition more fully. It means more power. Only when the ignition timing is too advance then you need to choice a colder plug. Otherwise I will choice the hottest plug that I can use.
my $0.02
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