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  '64 1/2 to '73 -- The Classic Mustang
  Hot or Cold Plugs vs performance ??

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Author Topic:   Hot or Cold Plugs vs performance ??
70 Pony

Posts: 1769
From: Glenmoore, PA, USA
Registered: Jan 2000

posted 05-21-2001 10:50 AM     Click Here to See the Profile for 70 Pony   Click Here to Email 70 Pony     Edit/Delete Message   Reply w/Quote
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....

Resto Mod '70 Sport Roof
Arrest Me Red

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Posts: 93
From: Marietta,GA
Registered: Mar 2001

posted 05-21-2001 11:24 AM     Click Here to See the Profile for Tom351   Click Here to Email Tom351     Edit/Delete Message   Reply w/Quote
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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Posts: 21
From: Toronto,Ontario,Canada
Registered: Feb 2001

posted 05-23-2001 02:16 PM     Click Here to See the Profile for Timo   Click Here to Email Timo     Edit/Delete Message   Reply w/Quote
You can try this link for more info.
Hope this helps.

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