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Date: Tue, 21 Jun 2005 07:23:29 -0500
Subject: Re: [FlyRotary] Re: Fuel Injector Position
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From: Jerry Hey <jerryhey@earthlink.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
In-Reply-To: <list-1008289@logan.com>
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On Monday, June 20, 2005, at 07:57 PM, Tracy Crook wrote:

> I'm kind of amazed that the 'far end of the runner injector position'=20=

> has gained such a following.=A0 As far as I can tell, it's popularity =
is=20
> based on a third hand report on 'the other list' about Racing Beat's=20=

> 900 HP turbocharged 20B project.=A0 They apparently made a comment =
about=20
> seeing slightly better BSFC with injectors at the far end of the=20
> runner.=A0
> =A0
> This may in fact have been true but an engine as radical as that is=20
> not necessarily indicative of what=A0we would experience on=20
> our=A0engines.=A0 I'd want better evidence before committing to this=20=

> configuration.
> =A0
> Tracy

I agree about needing positive evidence before committing to my design=20=

which is injection into the bells.  It is my intention  to build the=20
test engine and run in on a dyno.  This will include running it in=20
icing conditions (not difficult to produce in my shop in winter.)  The=20=

engine will have to have a stable idle and excellent throttle response.=20=

   If it does not, I will relocate the injectors.  The reason for bell=20=

mouth injection is that it is easy to fabricate an intake with both=20
secondary and primary injectors taking full advantage of the redundancy=20=

provided by your EFI.  The intake is just bolted on.  It can be=20
removed/changed if I don't like it.    Jerry

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On Monday, June 20, 2005, at 07:57 PM, Tracy Crook wrote:


<excerpt>I'm kind of amazed that the 'far end of the runner injector
position' has gained such a following.=A0 As far as I can tell, it's
popularity is based on a third hand report on 'the other list' about
Racing Beat's 900 HP turbocharged 20B project.=A0 They apparently made a
comment about seeing slightly better BSFC with injectors at the far
end of the runner.=A0

=A0

This may in fact have been true but an engine as radical as that is
not necessarily indicative of what=A0we would experience on
our=A0engines.=A0 I'd want better evidence before committing to this
configuration.

=A0

Tracy

</excerpt>

I agree about needing positive evidence before committing to my design
which is injection into the bells.  It is my intention  to build the
test engine and run in on a dyno.  This will include running it in
icing conditions (not difficult to produce in my shop in winter.)  The
engine will have to have a stable idle and excellent throttle
response.   If it does not, I will relocate the injectors.  The reason
for bell mouth injection is that it is easy to fabricate an intake
with both secondary and primary injectors taking full advantage of the
redundancy provided by your EFI.  The intake is just bolted on.  It
can be removed/changed if I don't like it.    Jerry


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