Michael McGee wrote:

In a recent thread some were discussing the benefits of putting the primary
injectors at the ports on the center housing where Mazda had them
originally.  The concern was for ease of cold starting,  The potential
problem of hard starts and a bunch of raw fuel spilling on the plug side
was brought up if all injectors were mounted at the other end of the intake
manifold (on the cold side of the engine).

I brought this up at the Q&A session at Pineapple racing.

Regarding hard starts-
It will of course take more cranking to start the engine, but how
much?  "Probably a couple of turns.  There should be no real trouble even
in cold temps"  In other words about four to six blades.

He was pretty confident that there would be no problem.  With the idle/warm
up speed we use for 2.17 and 2.85 redrives there should be no problem with
fuel puddling in the manifold either.

IF we end up with a problem, in the great white north or somewhere way
colder than here, use a solenoid primer system similar to what Van's
Aircraft sells for Lycomings.  From the fuel line plumb to a solenoid valve
then to the two injector ports on the center housing.  Fuel pump on, push &
release primer button, hit start.

MGM

Mike McGee, RV-4 N996RV, O320-E2G, Hillsboro, OR
13B in gestation mode

Its basically no different than a carb other than carbs with accelerator pumps
(most of them) are more prone to flooding. My O-470 has long runners
and it starts fine. Also there are tens of thousands of throttle body fuel
injection engines out there.

Paul Lamar
 
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