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Subject: Re: [FlyRotary] Re: Speaking of Mistral....?
Date: Mon, 19 Mar 2007 11:35:56 -0400
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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 
 
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<div>Dave, Bob, ET all,</div>


<div>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<SPAN contentEditable=false style="DISPLAY: inline-block"></SPAN>&nbsp;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.</div>


<div>Bill Jepson</div>


<div>&nbsp;</div>
&nbsp;<br>
-----Original Message-----<br>
From: Dastaten@earthlink.net<br>
To: flyrotary@lancaironline.net<br>
Sent: Sat, 17 Mar 2007 8:59 PM<br>
Subject: [FlyRotary] Re: Speaking of Mistral....?<br>
<br>

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<div class=AOLPlainTextBody id=AOLMsgPart_0_ec3964a5-a665-4483-9c8a-2ecfcd1e48ad>Bob White wrote:&nbsp;<br>
&nbsp;<br>
&gt;Hi Chris,&nbsp;<br>
&gt;&nbsp;<br>
&gt;&nbsp;<br>
&gt;Did Mistral provide the pump and/or regulator?&nbsp;<br>
&gt;&nbsp;<br>
&gt;Bob W.&nbsp;<br>
&gt; &gt;&nbsp;<br>
&nbsp;<br>
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.&nbsp;<br>
&nbsp;<br>
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 &lt;grin&gt;)&nbsp;<br>
&nbsp;<br>
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).&nbsp;<br>
&nbsp;<br>
The regulator would have a return from it going to the return circuit as well. Check valves on both return circuits.&nbsp;<br>
&nbsp;<br>
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.&nbsp;<br>
&nbsp;<br>
Our set up: Mistral Intake/Fuel rail. Dual Electric fuel pumps, EC2/EM2. Turbo capable.&nbsp;<br>
Dave&nbsp;<br>
&nbsp;<br>
--&nbsp;<br>
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