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Heat range has little to do with climate Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Fri, 22 Apr 2005 10:08:38
In Reply to: I noticed same change in color when I replaced the, Daren, Fri, 22 Apr 2005 07:53:47 Members do not see ads below this line. - Help Keep This Site Online - Signup |
The heat range refers to how well the plug can REMOVE heat from the cylinder, and therefore how hot the plug tip is.
A Cold plug removes heat better (makes the cylinder cooler) - this reduces knock and cylinder hot points. Typically, you put a cold plug into an engine if you will be driving it harder - hard acceleration, higher rpm, large power demands. If you drive the car leisurely, short trips, a colder plug can foul.
A Hot plug doesn't remove heat as fast, so the tip is hotter. This burns off carbon and oil on the tip. Ideal for those short leisurely trips, but not good if you're driving the car hard - you can overheat sections and cause knock.
If your engine is passing a little oil or isn't burning as well as you like, you'd go to a hotter plug.
To a point outside air temp has an effect - in cold weather ,you'd have a cooler intake charge, so you might want a Hotter plug to avoid fouling if you drive leisurely.
posted by 192.249....
, Fri, 22 Apr 2005 06:17:17, Fri, 22 Apr 2005 10:08:38 <-- Viewing This Message, Fri, 22 Apr 2005 07:52:13
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