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

Ian,

    What fuel are you using? Leaded or unleaded? My O2 sensor is

still

working after approx 100 hours of 100 LL but my spark plugs appear

to be

lead fouled in as little as 20 hours.

Ed anderson

Hi Ed.
I use unleaded around the home paddock and 120/130 avgas when away. I

don't

know what the 120/130 refers to but it "ain't low lead".  My results may

be

misleading as I have not used avgas for more than 18 hours without a

dose of

unleaded.. The oxygen sensor seems to be unaffected by avgas.
When refuelling away I decant the oil into a mixer container with some

fuel

drained from the tank, give it a good shake and put the mix into the

tank

before the fuel.
How's the flow monitor coming?
Ian.

Thanks Ian,

    Sounds like AvGas is harder on sparkplugs than O2 sensor which is not
what I would have initially thought.  Flow monitor is at the stage I am
waiting for a prototyping board so I can program a chip and hook up some
inputs and displays and start seeing where I screwed up the programming.  I
am to the point where I hesitate to do anymore programming until I see if
what I have already done is on the right track (like in it really works
{:>)).   I think this Microchip is one of the more complicated microchips
(based on what I have read) but on the other hand it has a bunch on nice
special purpose modules built-in and a great deal of flexibility. In the
meantime, still flying with my analog fuel monitor which continues to show
fuel use and flow to an accuracy of tenths of a percent.  The only trouble
with the analog is that there is no flexibility to change things without a
redesign and different hardware/wiring.

Ed Anderson

 
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