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Old 20-11-2005, 09:51 PM   #21
numbskull
 
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The length of the centre electrode and it's insulator from their 'root' within the plug, does indeed dictate how hot the business end of the plug runs, but the bit Matt is refering to, is the amount that the centre and side electrode protrude beyond the plug outer body, and into the combustion chamber. Plugs of the same heat range, and thus total length of electrode/insulator, are available with, or without the pretruding tip.

clear as mud


PS. yeah, can't remember which way round it is, but NGK and Champion's heat range number work opposite to each other.
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Old 21-11-2005, 12:11 AM   #22
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Yeh, Champion's 7's are cooler that their 9's so NGK is the other way.
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Old 21-11-2005, 10:13 AM   #23
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Quote:
Originally posted by Matt
I never understood the whole rat & mouse thing - can you explain Ben?
Simply called a 'mouse' because of its size relative to other V-8s that were available in 1955 when the small block was born.

It naturally followed that the big block would be called a 'rat'.

I'm guessing that the hemi was called an 'elephant motor' cause of its even larger size.
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