One Step Colder Plugs?

[snoboardcore]

Hey guys went to the autoparts store today. Went to the parts counter and asked for plugs they had either bosh or autolite so i went the autolite route. Anyways i wanted to go one step colder because of the supercharger. Well the plugs it said to use was the autolite 25's. So the guy at the parts desk told me i wanted the 24's but i got the 26's because wouldn't the 24's be hotter?

 

[poneypower89]

nope, pretty sure you should go with 24's bro.

 

[slow93]

no the lower the number the colder the plug on autolite

 

[HISSIN50]

Yep - 24's are one step colder than 25's (and 25's are the stock heat range).

 

[snoboardcore]

alright guys going back to the store today to get the autolite 24's and return the 26's. Just wanna make sure i want the 24's to go one step colder. Factory is 25's.

 

[HISSIN50]

Just wanna make sure i want the 24's to go one step colder. Factory is 25's.

Correct.

 

[Rick 91GT]

If they have the AR series Autolites get them

 

[88Stangboy]

Just curious...and to make sure...The colder the plug, means the hotter the spark, right? Or wrong? Or am i totally off here....

 

[bill302]

sparkplug heat range is the ability of the plug to dissipate heat. the longer the insulator the hotter the plug will operate.the shorter the insulator the cooler it will operate.a plug that absorbs little heat and remains too cool will quickly accumulate deposits of oil and carbon since it is not hot enough to burn it off. this leads to plug fouling and consequently to misfiring.a plug that absorbs too much heat will have no deposits due to the excessive heat.the electrode will burn away quickly and might lead to preignition and other ignition problems.so the temp range of a plug does'nt have anything to do with heat of spark it has to do with how well the plug itself dissipates heat.

 

[88Stangboy]

sparkplug heat range is the ability of the plug to dissipate heat. the longer the insulator the hotter the plug will operate.the shorter the insulator the cooler it will operate.a plug that absorbs little heat and remains too cool will quickly accumulate deposits of oil and carbon since it is not hot enough to burn it off. this leads to plug fouling and consequently to misfiring.a plug that absorbs too much heat will have no deposits due to the excessive heat.the electrode will burn away quickly and might lead to preignition and other ignition problems.so the temp range of a plug does'nt have anything to do with heat of spark it has to do with how well the plug itself dissipates heat.

Oh, ok...ive heard that before from someone. Been awhile though. One more thing, alright, so you want a colder plug for a high performance engine and a hotter one for a more stockish engine..am i right on that or is it the other way around?

 

[bill302]

Oh, ok...ive heard that before from someone. Been awhile though. One more thing, alright, so you want a colder plug for a high performance engine and a hotter one for a more stockish engine..am i right on that or is it the other way around?

yes,you are correct the more fuel, air and compression requires a colder plug which simply means the plug dissipates heat better and won't burn up ,glow and/or cause preignition.and a plug too cold will accumulate oil and carbon deposits and since plug is not hot enough to burn it off will lead to plug fouling and misfiering.