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From: "Paul" <sqpilot@bellsouth.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>,
	<prvt_pilot@yahoo.com>
References: <list-722202@logan.com>
Subject: Re: [FlyRotary] Re: Bad day at the airport
Date: Fri, 11 Feb 2005 12:25:41 -0600
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Hi, Steve....thanks for the info....it sounds like our fuel pumps are set up 
in a similar manner.  Not sure I understood the part about your two pumps 
going into the regulator. On my system, the two pumps are T'd into one line, 
which first goes to the fuel rail, then to the fuel pressure regulator, then 
from the regulator back to the sump tank.   Paul Conner

----- Original Message ----- 
From: "Steve Brooks" <prvt_pilot@yahoo.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Wednesday, February 09, 2005 12:14 PM
Subject: [FlyRotary] Re: Bad day at the airport


> Paul,
> I've been following this thread closely, and wanted to add just a couple 
> of
> things.  I'm not sure exactly how you fuel system is configured, but on my
> Cozy, I have two fuel pumps, mounted low (lower than the fuel tanks) on 
> the
> firewall, and they each feed a separate fuel filter, which then tee into 
> the
> regulator.  I use a 3 port regulator, so my fuel return is from the
> regulator, and a short feed, of about 18" to the fuel rail.   All my lines
> are AN6 or 3/8".
>
> I have taken off with coolant over 200, on a 90 degree day, and that was
> also back when I had marginal cooling.  I never had any issues with fuel
> flow or vapor lock.  God knows I've had almost everything else though.
>
> My fuel pumps and filters are mounted on the firewall, and the heat 
> exiting
> from the radiators and oil cooler is aft of the firewall by about 8-10
> inches, so I don't think (guess) that the pumps are getting very much 
> heat.
>
> It's really hard to say what your problem was, but one thing I was 
> wondering
> about, is how you are doing your tuning?  I use an O2 sensor to a LED bar
> display to aid with the tuning.  That way I know whether I'm running lean 
> or
> rich at a given MAP setting.  I know that you had an issue early on with 
> low
> RPM/power, and corrected it by going richer on the controller.  I just
> wonder if you may not still be a little too lean, especially at the upper
> end.
>
> I agree with the others, that it may be too soon to just scrap what you've
> built, and go a different direction.  I'm sure that you'll work through 
> it.
>
> Regards,
> Steve Brooks
>
>
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