Ian & Irene Beadle wrote:

I have spark plug thermocouples on my 13B. Just relieve the side of the
recess hole to allow the wire to come out. 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.
Bearing in mind that thermocouples must be cold junction compensated 5 [41 F]
degree C accuracy is all we can expect.  On a 25 degree C [77 F] day and full power
climb, the plug temps get to around 95C [203 F], by then I am at 8000feet with inlet
air temp. at 10 degrees C [50 F]  and every thing cools off, including my toes.
Ian RV6A 13B.

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

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