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Date: Sat, 11 Jul 2009 15:42:03 -0400
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Subject: Re: [LML] LOP in IO360
From: "John Schroeder" <jschroeder@perigee.net>
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Hi John -

If you can run LOP on the IO-360, all of the benefits (0 carbon monixide,  
fuel savings, long cylinder life, ... ) would be there for it that are  
available for your IO-550. However, I would echo the advice of the  
GAMI/APS folks regarding reliable LOP operations. One of them is to do the  
GAMI Lean check and send the results to GAMI. Chances are, you will need a  
set of GAMI Injectors to make sure that the F/A mixtures of all the  
cylinders are in a tight group (like a good rifle target). This will  
insure that at LOP you will not have one cylinder running too hot (too  
rich of a mixture) and one lean-firing because it is too lean. The other  
mantra they preach is to have a high quality engine monitor that will  
provide temps for all cylinders and EGT's. They have a corollary to this  
one: if the engine monitor is down, they don't fly until it is fixed.

Continental is doing much better with the F/A's on their big bores. Our  
IO-550 had a tight enough group that we did not need GAMI Injectors.  
However, one was very close to falling out of the group, and I suspect now  
that we may need to check it again with a GAMI Lean Test. Am taking it on  
a trip to Nova Scotia and will do it. Lots of things can cause the F/A  
mixture to change, but the injector bore is one of the best indicators.

Hope this helps,

John Schroeder
LNCE N58WP

On Sat, 11 Jul 2009 10:57:04 -0400, John Barrett <2thman@cablespeed.com>  
wrote:

> I have a Beech Sierra with a Lycoming IO360 engine - have been flying it  
> for
> years.  In the last month or two, I've noticed the peak EGT (one probe  
> only)
> has come down almost 100 degrees.
>
> I've also noticed that I can lean to LOP and the engine runs reasonably
> smoothly, while the last time I tried this a couple of years ago, the  
> engine
> would run very rough at LOP in cruise.  I normally operate the engine at
> about 65% power (22 inches of MAP) requiring 8 to 9 GPH to get ~50  
> degrees
> ROP.
>
> Anyone have a clue about what I might look for that caused the change?
> Anyone else able to run LOP with one of these engines?  Would I reap the
> same benefits as with the TSIO 550 running LOP?
>
> Regards,
>
> John Barrett, CEO
> Leading Edge Composites
> PO Box 428
> Port Hadlock, WA 98339
> www.carbinge.com
>  
>
>
>
>
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