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Old 09-28-2015, 12:28 PM   #1
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Spark Plug Temps... Hotter or Colder?

Why would you use a hotter temp plug when gasoline ignites at 495 degrees? What is the difference between cooler/hotter spark plugs? Does it make a huge difference with higher compressions?

Also, if you are running really rich, will a hotter plug help burn the extra fuel without over heating the head?
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Old 09-28-2015, 07:22 PM   #2
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The plug isn't really "hotter", it just pulls more or less heat out of the combustion chamber. A "colder" plug pulls heat out of the chamber faster. More Power/cylinder pressure also causes more heat so a colder plug is needed to prevent detonation. Ideally you want the coldest plug that doesn't foul. You need to get your AFR's right and then worry about changing the plug.
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Old 09-28-2015, 08:08 PM   #3
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Have you noticed when you pull an iron out of the fire, it stays cherry red for a while? That is what a hot plug does and a cold plug is like tossing water on it. If a hot plug is used, detonation can happen when the piston is still travelling up and really destroy the engine. When the split fire plugs came out 20 years ago, they were hotter than the plugs they replaced and man they messed up some engines. I blew a hole in 3 pistons.
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Old 09-29-2015, 07:31 AM   #4
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Originally Posted by Hypnotik View Post
The plug isn't really "hotter", it just pulls more or less heat out of the combustion chamber. A "colder" plug pulls heat out of the chamber faster. More Power/cylinder pressure also causes more heat so a colder plug is needed to prevent detonation. Ideally you want the coldest plug that doesn't foul. You need to get your AFR's right and then worry about changing the plug.
Thanks! Makes a lot of sense.

I had pulled the plugs out of my bike and they were fouled pretty bad from running rich... and this person I know, told me to run a hotter plug so it'll burn the excess gases

Let's just say he is not the most reliable source of information... so I had to ask you guys. What's funny, is the people who don't know, usually talk a good game to where it sounds pretty legit.
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Old 09-29-2015, 07:33 AM   #5
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Quote:
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Have you noticed when you pull an iron out of the fire, it stays cherry red for a while? That is what a hot plug does and a cold plug is like tossing water on it. If a hot plug is used, detonation can happen when the piston is still travelling up and really destroy the engine. When the split fire plugs came out 20 years ago, they were hotter than the plugs they replaced and man they messed up some engines. I blew a hole in 3 pistons.
That sucks, good to know though!
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Old 09-29-2015, 05:19 PM   #6
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Quote:
Originally Posted by flipstyledsm22 View Post
Thanks! Makes a lot of sense.

I had pulled the plugs out of my bike and they were fouled pretty bad from running rich... and this person I know, told me to run a hotter plug so it'll burn the excess gases

Let's just say he is not the most reliable source of information... so I had to ask you guys. What's funny, is the people who don't know, usually talk a good game to where it sounds pretty legit.
Fix the reason it is running rich.Changing plugs to a dufferent heat range will probably have little or no effect on your issue.
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Old 09-29-2015, 05:23 PM   #7
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Quote:
Originally Posted by bdmpastx View Post
Have you noticed when you pull an iron out of the fire, it stays cherry red for a while? That is what a hot plug does and a cold plug is like tossing water on it. If a hot plug is used, detonation can happen when the piston is still travelling up and really destroy the engine. When the split fire plugs came out 20 years ago, they were hotter than the plugs they replaced and man they messed up some engines. I blew a hole in 3 pistons.
I had an engine blow on me also. Bike was only 8 months old and Kawasaki would not warranty the engine even though the plugs were installed by the dealer.
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