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/ > Archive and UnSub: > http://mail.lancaironline.net:81/lists/flyrotary/List.html > ------------------------------------------------------------------------ 
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