Message-ID: <000401c4342d$3dbc2690$2402a8c0@EDWARD>
From: "Ed Anderson" <eanderson@carolina.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-3210294@logan.com>
Subject: Re: [FlyRotary] Re: fuel injector prices
Date: Fri, 7 May 2004 08:17:18 -0400
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 > > Ed.
> > Thanks. I follow that. So with 4 of these 550cc suckers going full belt
I'd
> > be capable of expelling  52/6 * 4 = 34.67 gals/hr. Seems a bit
excessive!
> > Also - does fuel pressure factor into the equasion?
> > John
>
> John, I believe it does. If the EC2 controls only the pulse length, Higher
> pressure will expel larger quantity of fuel than lower pressure for the
same
> injector opening. I don't think the EC2 takes into account the capacity of
> the injector?
> Bulent
>
>

Actually, the injector timing (Fuel Map) for the EC2 was developed with the
460 cc/min injector (stock) as the nominal injector.  Of course, you can use
injector rated higher or lower by simply adjusting (up to a limit) the fuel
map for your particular flow rate to give you the desired Air/Fuel ratio.
Also it is assumed that your fuel system has a manifold referenced fuel
pressure regulator.  This is the type that keeps the same pressure
differential across your injectors between the pressure in your fuel line
and manifold pressure to keep the flow rate constant.  If you do not have a
manifold referenced pressure regulator then different manifold pressures
will cause a non-constant pressure differential across your fuel injectors
and will affect the flow rate.  The engine will still run, its just that
your fuel MAP setting will not be as stable as they would be with a manifold
referenced fuel pressure regulator.  There! more than you wanted to know.

Ed

Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC