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Date: Mon, 11 Sep 2006 08:01:17 -0500
From: Dennis Haverlah <clouduster@austin.rr.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] It runs!
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Was the engine missing-out or running smoothly at the max. rpm it would go?

Bob Darrah wrote:

> Finally started my 20b on the test stand.  It runs, but not very good. 
> Using Tracy's ECU and monitor, and a long (about 10 foot) umbilical 
> cord from the firewall, it will idle about 900 rpm, starts right up, 
> but can hardly get 6000 RPM without prop.  The timing strobe shows 
> about 35 degrees BTDC.  Seems to smoke a lot.
>
> Possible causes:
>     Too much oil in gas-just dumped in a couple gulups of oil in an 
> estamated 2 gallons of gas.
>     Embilical cord too long.
>     Intake manafold-homemade log type about 4 inch dia, with short 
> (5in) runners, tapering top to botom from log diameter to intake port 
> size, but constant width, the same as the ports.  They match the ports 
> well.  I am in a good position to put the original intake back on to 
> see if that will help, (last resort).
>     Exhaust pipe attaches to where the turbo will go and is a used 
> auto exhaust system, about 18 feet long including muffler.
>     Something else, anyone got any good ideas?
>
> I would like to get it to run better before I hang it in my Seawind. 
> Hanging it in that airplane is no easy task.
>
>
> Bob Darrah
>
> -- 
> Homepage:  http://www.flyrotary.com/
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>