Had a little talk with Klause about spark plugs.
He said if they are fouling and the gap is not increasing
they are too cold. Go to hotter plugs.
Nippon Denso, if you can find them, are better.

He also says 50 hours is typical for auto plugs in
aircraft. He should know. He has over 100 MSD "Plasma"
systems in the field.

Paul Lamar

Paul
My B9EV  and  B10EV plugs just past 100hrs and still going strong.
Ian.

Are you using the stock ignition Ian?

Paul Lamar

Can somebody clarify what all the numbers and letters mean on plug
designations?
BUR7EQ, does the R mean resistor?  I wouldn't think so if the stock
wires have
resistance.  Do the B9EV have resistance?  Would moving the resistance
from the
wire to the plug affect life?  Wouldn't think so.

--
Perry Mick
Duckt N7XR
http://www.ductedfan.com

The lower the number the hotter the plug.
R stands for resistor plug. 5K ohms.

How do I know all this? :-)

I just downloaded the pdf file from the NGK website :-)
Here it is.

Paul Lamar

Isn't the internet amazing.  So the difference
between Ian's plugs and mine, are he has fine
wire gold paladium center electrode, no 4-ground
electrode, and no resistor.

Perry

Yair G'day Paul,

This site

http://www.wakularacing.com/new_page_1.htm

has a shot of the  NGK plug codes table,  as well as some really
useful info and insights.  TOP site for anyone wishing to
understand plugs:.

A lot of the info on this site has been lifted from the NGK site,

http://www.ngksparkplugs.com/techinfo/spark_plugs/overview.asp

So NGK must rate their plugs differently in the northern
hemisphere? {:>)  Down Under in my NGK cattledog,  the bigger
the number,  the COLDER the plug,  which is OPPOSITE to some
other manufacturers (like Campion)..

As an example, a stock Mazda plug for the old engines was a
B7EM, (two prong) or a B7ET (three prong).  The gold/platinum
racing equivalent heat range was B7EGV (single prong)..

Most racers use B9,  B10,  & B11.  NGK have special racing plugs
with an 11.5 heat range.  Best source of NGK  racing plugs is
usually the motor cycle shops if you don't have access to a local
Mazda specialist.

Best wishes and kindest regards,

Leon Promet
leon@promotorsport.com.au

You are right the lower the number the hotter the plug.

Paul Lamar
 
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