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Date: Thu, 28 Jul 2011 10:21:47 -0500
From: Patrick <patrick@hoffmann1.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
CC: Lehanover@aol.com
Subject: Re: [FlyRotary] Re: Injector mounting in top of block?
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Would this be using premixed gas & oil?  If not, could there be an issue 
with the fuel washing the oil off the walls?

Heading to OSH this evening!

Patrick

Lehanover@aol.com wrote:
> As you said, fuel pooling is a problem even for injected engines. So 
> you see water heated manifolds, just as in carbureted  engines. Note 
> the Lycoming with the distribution pot inside the oil pan. Heated oil 
> keeps the mixture in a gas like state and the latent heat of 
> evaporation helps cool the oil. On hot days there is a loss of power 
> based on intake air temperature, but they suffer fewer carb icing events.
> Injectors do a better job of cooling the intake tubes close by, and 
> absent some warming agent, some condensation will return to the fuel.
> At the least at lower power settings. So Mazda would appear to have 
> moved the injector to the housing so that the fuel spray is facing the 
> 300 degree plus rotor face. Plenty of heat to maintain a gas like 
> state. So the rotor face is cooled some by the fuel. And thus a cooler 
> oil in the rotor. There is no power loss because the chamber is closed 
> and incoming air was not heated prior to entry so density was not lost.
> Lower rotor face temps allow for more intake to enter, and thus more 
> power.
> The injector is firing into a low pressure unless turbo charging is 
> involved. I am unable to detect a downside to this layout.
> An idle at 2000 RPM can be tolerated, to protect reduction gears.
> The racer idles between 2000 and 2200 RPM. So one big injector might 
> do just fine, even if idle is less than ideal.
> Lynn E. Hanover
> In a message dated 7/27/2011 2:00:15 P.M. Paraguay Standard Time, 
> echristley@nc.rr.com writes:
>
>     The MegaSquirt can time the injection based off of the ignition
>     timing.
>     I'm having some issues with my manifold.  The way I built it is
>     causing
>     fuel to puddle in the bottom (so, you live, learn and rebuild).  I
>     can
>     probably move the two fuel injectors to the oil injection ports
>     easier
>     than I can build a new manifold.  The other two injectors are at the
>     stock position in the center plate.  Then I would tune the fuel
>     injector
>     timing to minimize EGT.
>
>     Am I fooling myself?  And, if so, how?
>