[bmw] re: colder plugs

[tedcrum@xxxxxxxxxxxxxxxxxxxxx]

I don't have my books with me now to see if I can find a plug for you.

But a "semi suface discharge" spark plug generates a spark that, over part 
of its length, tracks across the surface of the insulator. This allows a 
longer spark for a given voltage and helps clean the plug when it is 
cool. The "semi" means that the spark also spans a gap, which give 
protection against the sudden and complete fouling that plagues true 
surface discharge plugs.

The Bosch Platinum Plus Four is an example of a SSD plug.


-tc 



> Date: Tue, 16 Dec 2003 12:23:18 -0500
> From: "Michel Drainville" <MDrainville@domain.elided>
> Subject: [bmw] Colder spark plug
> 
> Hi.
> I need your help on this one. My engine(M42)  uses NGK BKR6EK plugs. I
> installed a turbo on it last summer. I would like to go to a colder 
plug.
> So, the next colder plug is a BKR7EK.  When I search the net for the 
7EK,
> the only places selling that plug are motorcycles and snowmobile stores.
> Is is the same plug as in my car, except for the heat range?  Also, some
> list the extension U (BKR7EKU).
> According to NGK, the U means: " Semi-surface discharge" What does that
> mean? I don't know.
> 
> here is a link explaining the NGK numbers:
> http://www.corollaperformance.com/TechInfo/NGK-Info.html
> 
> and here, a store selling plugs for marine equipment and motorcycle 
which
> have my #s.
> http://www.southernms.com/online/pdfs/electrical.pdf
> 
> Can anyone help me?
> 
> Thanks in advance
> Michel.

-- 
Ted Crum
tedcrum@domain.elided
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