|
|
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
--
For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.html
|
|