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

strong.

Ian.

Are you using the stock ignition Ian?

Paul Lamar

 No, Microtech. 4 separate coils. No ballast resistors. Bosch

spiral

leads, no R in the plug. Leaned out as far as she will go without

change

in

RPM when cruising.
Ian.

Ian,
I know it 'sounds right' to lean the engine to the no-rpm-drop point but

if

you go a bit further with the leaning, the fuel burn goes down much

faster

than the rpm.  The 2-3 knots of airspeed loss (if at WOT) is a small

price

to pay for the reduced fuel burn.  If not at WOT, just open the throttle

a

bit more to compensate for the lean mixture drop.

Also, do you have a mixture monitor and if so, what is it reading at

your

cruise setting?

Tracy

Thanks for the information Tracy. I will experiment next weekend. The
mixture monitor is part of the Michrotech system and reads around 15.5. I
don't think it is very accurate as it flicks around a bit. The LED home made
monitor is much more stable and is just in the yellow at lean criuse.
Ian  Soon to be bright yellow RV6A

 
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