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In a message dated 2/17/2011 11:42:10 A.M. Eastern Standard Time,
echristley@nc.rr.com writes:
Dustin
Lobner wrote:
> Hi everyone,
>
> I posted this today on the
HomeBuiltAirplanes forum. Going to C/P it
> here for
comments/questions/flaming.
>
> Background, I'm planning on
building up a Renesis with a Turbonetics
> turbo, putting it into a
Mustang II. I'm planning on using MegaSquirt
> 3 (or whatever is
available when I get there) ECUs. These ECUs
> control things
like waste gate management, any servos you want, in
> addition to the
the EFI and ignition.
Dustin, I'm using the Megasquirt-3. God
willing, and the creek don't
rise, it should be making some noise this
weekend. All I've got left is
to install the throttle cable, run a
water line, and attach the battery.
(and then carefully step through each
system to make sure everything is
connect, of course).
I went with
the Ford EDIS ignition. The MS will control the advance,
but the
ignition will continue to operate with 10 degrees of advance if
the MS
dies. I positioned the VR sensor so that the advance will
actually
be 25 without any input. Initially, I'm only using one 4-place
EDIS,
with the waste spark going to the trailing plug. A future
enhancement is to install the second EDIS module, and ground the waste
spark, forcing all the power to drop across a single plug. I have
two
VR sensors installed, both using the same pickup wheel.
I'm
using stock injectors, with a returnless fuel system. In case of
fuel-pump/Megasquirt/injector failure, I ran a second fuel line to the
throttle body that is controlled by a needle valve. If the injectors
quit for any reason, the plan is to crack open the valve and let the
fuel just dump into the intake. It will most likely run rough, and
it
would never start that way, but it should keep me in the
air.
--
Homepage: http://www.flyrotary.com/
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You can run the leading plugs in the "wasted Spark"
mode but not the trailing plugs.
Because, one rotor will always have an apex seal
between the leading and trailing plugs, exposing the next fuel/air charge to a
firing trailing plug. Very bad Mojo.
However, you can fire both plugs in either housing at
the same time (no split) with either a double ended coil designed for lost
spark, or two separate coils, one for each plug. Works fine. Raced with it for
years.
Three pictures show how this is done. You could also
run a Crank angle sensor to drive one system and the toothed wheel to run the
other. Or the one on the flex plate or drive adaptor. Or any combination, so
long as the trailing plugs are distributed (Never fire at the same time). Note
the single reluctor and separate pickups for the trailing
plugs.
The diagrams have to do with racing. Airplane timing
at WOT should not be much over 25 degrees. As little as 20 degrees is fine
up to 9,000 RPM. This works fine for even crap, low octane car gas. More timing
and you may want some octane involved.
Lynn E.
Hanover
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