hot or cold?
Grand Champion
Joined: Apr 2009
Posts: 5,293
Likes: 3
From: Kekaha, HI
I use plugs that are one range colder than stock. NGK BKR7E stock# 4644
Okay, colder range spark plugs conduct heat away from the firing tip faster and thus help reduce pre detonation and plug damage. Generally used on supercharged, turboed, nitrous and other high compression engines.
When going hotter plugs you usually have to run a higher octane fuel to avoid preignition, knock etc. You want to run a heat range hotter if you think you have oil getting into the cylinder or more commonly called "burning up oil". This will help burn the oil and clean the plug of oil and help correct/prevent fouling. If you run hotter plugs, go with copper as it will allow you to run hotter without the risk of preignition.
Okay, colder range spark plugs conduct heat away from the firing tip faster and thus help reduce pre detonation and plug damage. Generally used on supercharged, turboed, nitrous and other high compression engines.
When going hotter plugs you usually have to run a higher octane fuel to avoid preignition, knock etc. You want to run a heat range hotter if you think you have oil getting into the cylinder or more commonly called "burning up oil". This will help burn the oil and clean the plug of oil and help correct/prevent fouling. If you run hotter plugs, go with copper as it will allow you to run hotter without the risk of preignition.
Champion
Joined: Feb 2010
Posts: 3,686
Likes: 0
From: Greenfield, Wisconsin
Hendrixx,
I just went with the Autolite 3923s (One range colder than stock) and they smoothed out the engine a little. I also wanted to reduce any chance of the stock champions running too hot with the new throttle body. So with the couple mods I have, the Autolites work pretty well. If you look in the sticky commonly asked questions, in the spark plug threads its all discussed.
If you arent sure though, always start out colder and move to a hotter range. A cold plug wont damage an engine, it will just foul sooner due to it not being able to burn off everything in the cylinder. On the other side, if you go too hot you will have to run a higher octane gas and if it is still too hot you will get pinging causing damage to the engine.
Just make sure you get a copper core plug. Platinums serve no performance benifit, only a longer change interval and many people dont prefer them in the Magnum engines.
I just went with the Autolite 3923s (One range colder than stock) and they smoothed out the engine a little. I also wanted to reduce any chance of the stock champions running too hot with the new throttle body. So with the couple mods I have, the Autolites work pretty well. If you look in the sticky commonly asked questions, in the spark plug threads its all discussed.
If you arent sure though, always start out colder and move to a hotter range. A cold plug wont damage an engine, it will just foul sooner due to it not being able to burn off everything in the cylinder. On the other side, if you go too hot you will have to run a higher octane gas and if it is still too hot you will get pinging causing damage to the engine.
Just make sure you get a copper core plug. Platinums serve no performance benifit, only a longer change interval and many people dont prefer them in the Magnum engines.
Champion
Joined: Feb 2010
Posts: 3,686
Likes: 0
From: Greenfield, Wisconsin
You'll like them. And if you dont the plugs are pretty easy to swap out. I did mine in under an hour because this time I got a spark plug socket which worked great. Last time I was fishing the old plugs out with a needle nose and threading the new ones in with a foot long heater hose.
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Record Breaker
Joined: Jan 2009
Posts: 1,801
Likes: 2
From: Pennsylvania
