Ian & Irene Beadle wrote:

snipped

 The spark plug temperatures run

consistantly 10 degrees C [50 F]. higher than the coolant temperature measured at
Mazda's spot on the block, which is usually 5 degrees C [41 F] higher than up top
near the thermostat, where the one for the EMC is.

Thanks for the good data Ian. the only thing I question is the
water temp when the plugs are 95C [203 F] You mean it is only
85C [185 F]??  Good cooling you got there on full power climb :-)

Paul Lamar

Charlie Kuss wrote:

Paul,
Does that mean that you don't question Ian's assertion that a 10 degree centigrade temp
RISE is 50 degrees farenheit? (It's only 18)   I doubt very much that the actual temp is
10 degrees centigrade. If it is, that engine is not producing much power! :-)
Charlie Kuss

I had a sneaking suspicion there was something wrong with my conversion
numbers but I could not quite put my finger on it at the time.

10 C is indeed 50 F but the difference between 85 C and 95 C is indeed
10 C and only 18 F. See how the metric system screws us up?
As Vance is fond of saying; "We got to the moon on inches" :-0

Thanks for catching that Charlie.

The bottom of the plug shank is not the bottom of the threaded
portion of the plug so I suspect there still is a large
temperature gradient in that area. According to Mazda's data it is
much hotter at the real bottom of the plug or 210C or 410 F full
power WOT 7000 RPM.

Paul Lamar
 
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