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Date: Tue, 20 Mar 2007 00:04:04 -0500
From: David Staten <Dastaten@earthlink.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Speaking of Mistral....?
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Bill.
    I understand what you are saying here. Unfortunately I dont think 
you are visualizing our setup as it actually is. The mistral-provided 
fuel rail has the pinhole MACHINED into the far end of the rail. There 
is no way for the pinhole to bypass a regulator attached to the far end 
of the fuel rail, as the pinhole comes first (beyond the injectors, but 
before the threads)

I understand the reasons why to have a pinhole to bypass the regulator. 
The only way we can install a regulator downstream of the fuel rail 
would be to drill/ream the pinhole, then put T's with another pinhole 
between the rail and regulator. Chris doesn't like the idea of 
drilling/reaming the pinhole out. I'm indifferent (as in, any workable 
solution is fine with me).

Dave

wrjjrs@aol.com wrote:

> Dave, Bob, ET all,
> The normal position for the fuel regulator is after the fuel rail. You 
> will need a return line to the tank. The small orifice is used ONLY to 
> allow a re-prime and bypasses the regulator. There is almost no change 
> in fuel pressure with that tiny hole. I appologise if everyone knows 
> this already. It needs to be said though that the reason for the 
> orifice has nothing to do with the fuel pressure, it is simply a 
> device to prevent vapor lock if you run a tank dry. I think it's a 
> good idea.
> Bill Jepson
>  
>  
> -----Original Message-----
> From: Dastaten@earthlink.net
> To: flyrotary@lancaironline.net
> Sent: Sat, 17 Mar 2007 8:59 PM
> Subject: [FlyRotary] Re: Speaking of Mistral....?
>
> Bob White wrote: 
>  
> >Hi Chris, 
> > 
> > 
> >Did Mistral provide the pump and/or regulator? 
> > 
> >Bob W. 
> > > 
>  
> Mistral did not provide the pump or regulator. What was purchased and 
> provided was an intake with runners, integral throttle body, fuel rail 
> with injector bosses and heat shielding that is integral to the fuel 
> rail and mounting. 
>  
> I know what Chris was trying to say, because he and I have discussed 
> this at length, and while its a little difficult to visualize from 
> text only, its an accurate representation of what has transpired, with 
> all the engineering input (reserved input, I might add <grin>) 
>  
> What I have NOW recommended to Chris is that we have a T UPSTREAM of 
> the fuel rail, with the regulator now on the side/rise of the T, and 
> the fuel rail on the distal run of the T, feeding the rail, the 
> pinhole and the fuel return circuit. This will effectively cause the 
> fuel pressure at all points downstream of the T/Regulator assembly to 
> be at the set regulated pressure (this is a manifold referenced fuel 
> pressure regulator). 
>  
> The regulator would have a return from it going to the return circuit 
> as well. Check valves on both return circuits. 
>  
> I've made it explicitly clear to Chris that we do in fact need a 
> regulated fuel supply for our fuel injection to work properly/best. 
> The pinhole by itself does not serve this purpose adequately, becase 
> the fixed pinhole cannot modulate its size to maintain a constant 
> pressure at all throttle and fuel flows. 
>  
> Our set up: Mistral Intake/Fuel rail. Dual Electric fuel pumps, 
> EC2/EM2. Turbo capable. 
> Dave 
>  
> -- 
> Homepage: http://www.flyrotary.com/ 
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