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Date: Sat, 04 Jun 2005 19:17:27 -0400
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Subject: Re: [FlyRotary] Re: BAR GRAPH AIR/FUEL GAUGE
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Hi Ian, I am flying with a Holley Pro-Jection two barrels fuel injection 
system and a homemade intake manifold.
Yvon.

----- Original Message ----- 
From: "Ian Dewhirst" <ianddsl@magma.ca>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Saturday, June 04, 2005 5:49 PM
Subject: [FlyRotary] Re: BAR GRAPH AIR/FUEL GAUGE


> Hi Yvon, what type of fuel system are you using? -- Ian
>
>
> -----Original Message-----
> From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On
> Behalf Of Géraldine Berger & Yvon Cournoyer
> Sent: Saturday, June 04, 2005 5:37 PM
> To: Rotary motors in aircraft
> Subject: [FlyRotary] BAR GRAPH AIR/FUEL GAUGE
>
>
>   I fly a Zenair Zenith 200 with a l986 13B.  I have installed a
> Cyberdyne Instruments bar graph air/fuel gauge (P/N 7009). The O2 
> sensor
> is located ~31 inches from the exhaust ports. The O2 sensor is not a
> Cyberdyne Instruments part. It is an aftermarket universal single wire
> sensor. The readings of the air/fuel gauge are baffling me. At idle of
> 1100  rpm and MP of 14.1-14.2 inches/mercury, the air/fuel gauge shows 
> a
> rich condition of ~12.7:1. That is where the engine runs best at idle.
> At full power static of 5200-5250 rpm and MP of ambient (~30
> inches/mercury), the air/fuel gauge reads rich ~13.2:1. However, when 
> I
> retard the throttle to 3000-3500  rpm, at a MP of 17.0-17.1
> inches/mercury, then the air/fuel gauge reads lean at ~16.0:1. The
> engine runs quite evenly at all power settings but I wonder if the
> variations in fuel mixture are normal and safe?
> Yvon.
>
>
>
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