sparkplug heat range

[robertccach]

Right now Im useing champion copper plus spark plugs that have a heat range of 14.I was thinking on getting the ngk 55s which have a heat range of 5.My question is what if any difference in the way the engine runs will I notice by switching.Is there a big difference in a heat range of 14 vs 5?

[Dutch]

The NGK "5" is one step colder than the Champion "14". As far as what differences you will "notice"...could be none, but could also cause "fouled" plugs. The "colder" a plug rating the faster it can dissipate the heat generated by the firing of the plug, which by itself sounds great - right! Wrong...your internal engine is made to run at a predetermined heat range...if it runs cooler, you may not "burn" everything in the chamber and foul your plugs.

Unless you have made "MOD's", its better to stick with the OEM set plug range.

Word to the wise...if you change the plugs to the "colder" ones, let that be the only modification you do at that time so that you can get a better idea of what changes they make by themselves.

Hope this helps, and hope I didn't talk to much!