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Author
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Topic: Hot or Cold Plugs vs performance ??
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70 Pony
Gearhead Posts: 1769
From: Glenmoore, PA, USA
Registered: Jan 2000
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posted 05-21-2001 10:50 AM
   
Are there performance or "combustion" pros and cons to moving to a colder or hotter plug than called for ????
My TFS heads call for autolite 3924's...I was running 3923's (one step colder) and as I changed back to 24's I examined the 23's and they looked like they had burned "Perfect"...haven't ran the 24's long enough for a comparison except It looks like the car runs a little hotter in traffic with the 24's.....I guess what I'm asking does the plug heat range effect the "combustion" of the air/fuel mix and should any adjustments such as timing or octane be made when changing heat range in plugs.
Thanks in advance....------------------
EDDIE D
Resto Mod '70 Sport Roof
Arrest Me Red
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Tom351
Journeyman Posts: 93
From: Marietta,GA
Registered: Mar 2001
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posted 05-21-2001 11:24 AM
Heat range refers to the ability of the plug to dissipate heat. A colder plug has a shorter nose that allows heat to transer into the head faster. You need colder plugs if the current heat range is getting hot enough to cause pre-ignition.------------------
67 Fastback - Arctic White Pearl paint
351W ,Trick Flow Aluminum Heads, Edelbrock TorkerII, Carter 750 CFM, Comp. Cam 477/510 219/[email protected], Performance Automatic C-4 Trans, 3.55 gears, Front Disc Brakes, 1-1/8" Fr. 3/4" rear sway bars.
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Timo
Journeyman Posts: 21
From: Toronto,Ontario,Canada
Registered: Feb 2001
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posted 05-23-2001 02:16 PM
You can try this link for more info.
Hope this helps.
http://www.ngksparkplugs.com/techinfo/spark_plugs/overview.asp
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