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From: Dale Rogers <dale.r@cox.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: [FlyRotary] Re: Fuel Injector Position (was  Re:
Date: Mon, 20 Jun 2005 21:35:30 -0400
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Jim,

   I think you skimmed over an important qualification of 
Dave's comment: 

>> ... The worry to me here is that with the
>> TB at the other end of the runner,ie close to the port, 

which exactly fills this part of your analysis:

> ... I think carb ice is pretty much always associated with 
> fuel sprayed into a venturi, and the injectors in our application are 
> always downstream of the "venturi" formed by the partially open throttle.

Dale R.
(the world needs more Lerts ...)
 
> From: Jim Sower <canarder@frontiernet.net>
> Date: 2005/06/20 Mon PM 09:18:54 EDT
> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> Subject: [FlyRotary] Re: Fuel Injector Position (was  Re:
>  Makingprogress on Chris n Dave's Velocity Engine)
> 
> But wouldn't that be true of ANY injectors placed a significant distance 
> from the block?  I think carb ice is pretty much always associated with 
> fuel sprayed into a venturi, and the injectors in our application are 
> always downstream of the "venturi" formed by the partially open throttle.
> I wouldn't worry ... Jim S.
> 
> david mccandless wrote:
> 
> >     On PL's recent PP dyno run, he stated that with the injectors
> >     placed near the entry of the runners, there was considerable
> >     evaporative cooling taking place and as the tubes were running
> >     very cold VE should be good. The worry to me here is that with the
> >     TB at the other end of the runner,ie close to the port, there is a
> >     real risk of ice build up on the throttle body butterfly. The old
> >     bugbear of carb ice is back. FWIW, Dave McC
> >
> >
> >     since the
> >
> >         ----- Original Message ----- *From:* Jerry Hey
> >          
> >         based on Paul Lamar's current p port testing there is no
> >         problem with placing the injectors at the far end of the
> >         runners. This is also backed up by an article on the internet
> >         (How to Fabricate an Intake Manifold) The idle issue is not
> >         with injector location but rather with butterfly location.
> >
> >
> 
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