X-Mozilla-Keys:                                                                                 
Tracy Crook wrote:

Mark Steitle idea about using the oil injection ports for emergency fuel
nozzles
is a great one IMHO. I'm mixing 2 cycle oil in the fuel anyway. I have
been
concerned that both the fuel injectors & pump, and ignition, are totally
dependant on the electrical system. I had considered adapting a constant
fuel
flow system tied to the throttle using a shutoff valve to actuate it. I
wonder
if there is adequate vacuum thru the oil ports that it could work like a
crude
carb based upon throttle opening to make a reasonably acceptable
air/fuel ratio
by just using jets.

If so it would eliminate the injectors and pumps, assuming
that you can isolate the ignition side of the engine controller. It
could be
just a fuel line from the tank with a manual shutoff valve feeding the
oil ports
(w/jets). Now we need to know if the vacuum thru the oil port is the
same as the
intake manifold, and if it is adequate to induce fuel flow. I'll do some
testing, unless somebody already has tried this.

Now if we could just come up with a redundant method to fire the plugs!

charles.harbert

It won't be quite this simple.  The vacuum at this port is higher at low
throttle and close to zero at full, just the opposite of what you need if
you are depending on vacuum.

I just duplicated everything in my EFI controller to achieve redundancy.
You gotta have electricity for the ignition anyway so why not do it this
way?  I also have a backup mode for injector failure.  One pair is shut down
and the flow (duty cycle) is doubled on the other set.

Tracy Crook
www.rotaryaviation.com

The subject of the number of wires feeding power into your system 
came up Tracy. Are there two connections for power? One for each
computer?
Also does your computer vary the ignition advance with altitude?
Can it set the advance separately for leading and trailing plug?


Paul Lamar
 
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