From: Lehanover@aol.com
Message-ID: <158.24f60be1.2ca27a25@aol.com>
Date: Wed, 24 Sep 2003 00:40:05 EDT
Subject: Re: [FlyRotary] Re: Power on a cold day was Re: [FlyRotary] Re: Some turbo th...
To: flyrotary@lancaironline.net
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In a message dated 9/23/2003 7:48:32 AM Eastern Daylight Time, 
eanderson@carolina.rr.com writes:

>  First, I absolutely agree, Al that the increased in power that would move 
my 
> static rpm from 5200 to 5800 rpm on a cold day, could of only had a small 
> contribution from the colder denser air.  Once, I eliminated a possible 
tach 
> malfunction at high rpm, that increased power puzzle is part of what got me 
> started on this DIE analysis.  It is now clear to me how and why that 
> additional power was there on cold days, but not on the warmer days.  In 
fact,
>  in my presentation in October at Shady Bend, I use that the equations to 
> explain exactly how and why that was happening to my engine.
>

  
   Is not the improved performance from the colder intake air, the reverse of 
the poor    
   performance we look for when we check the carb heat? 

   If you supply hot air to the inlet without adjusting the mixture, (already 
ideal for the 
   colder intake air), that makes for a lowered volume of oxygen for nearly a 
constant 
   supply of fuel. 

   At least on carburetted engines, this is driving the mixture way rich, and 
lowering 
   the total oxygen available. Thus lowered RPM, and poor performance. But 
with or 
   without the corrected mixture of an injection system, less total oxygen 
means 
   poorer performance. Not an anomaly. An expected outcome.

   The rotary, when equipped with a powerful ignition system, will run way 
over rich   
   as well as way over lean. Best power is at 1565 degrees EGT. This is well 
on the 
   rich side of peak EGT, as that can be over 1700 degrees. 

   The engine will seem to be running just fine. No miss firing at all. You 
need at 
   least an EGT probe in each exhaust header. In the air just the RPM is all 
you 
   need. Best power mixture is the same place and time as best RPM.


   Lynn E. Hanover