Bosch spark plug deciphering

[Brady Moffatt]

Why not stick to what the manufacturer recommends? I would if the engine was
stock (Lehmann ECU and more boost) I also took some advice off the IA site
(Ned suggests W7DTC) and I wanted to know of the plugs were hotter or colder
than stock.

According to what you quoted, I think Bosch has reversed the definitions of
hot and cold plugs. I always thought that a cold plug kept the combustion
chamber colder, and therefore had _high_ heat absorption ability???!

Cheers,
Brady Moffatt
Montreal, Quebec, Canada
83 UrQuattro with 51,000 miles
86 4ksq with 309,000km
86 4ksq parts car
72 Datsun 240Z with 180,000 miles
92 VW Golf with 200,000km FOR SALE
in middle stages of quattrosis accumulatus


----- Original Message -----
From: <C1J1Miller at aol.com>


> Bosch says "...a low heat range number indicates a "cold plug" with low
heat absorption through its short insulator nose.  A high heat-range code
number applies to a "hot plug" with high heat absorption through it's long
insulator nose"...
> So, 2-4 is cold, 7-10 is hot...
>
> why not stick with what the manufacturer lists?
> Chris
>
>
> Brady Moffatt writes:
> -----------
>
> Hi All,
>
> Is a 7 a hotter plugs than a 6 in Bosch-speak?
>
> I was just at the NGK site www.ngk.com . In NGK-speak, a higher number is
> colder (dissipates more heat).
>
> Cheers,
> Brady Moffatt


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