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

 
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