I formerly owned a Lancair IV with a normally aspirated IO550. At the time that I owned that set up I was ignorant of the whole lean of peak thing. As a result I would fly exclusively ROP and lean CHTs to 380* (didn't worry too much about EGTs), 24 squared and consistently saw 225 KTAS and 15 GPH fuel burn. My friend, who also formerly owned a normally aspirated LNC4 with a Lycoming, flew his set up the same way as me and saw 224 KTAS and and 17 GPH fuel burn. I cannot fathom how or why yours would be drinking fuel like it is but I do not fancy myself on being an authority on anything. Sent from my iPad Berni Breen
Not sure about your setup...
But I have a few clients who can run their T-550’s and T-520s down
around 12 GPH..
Shees.. Takeooff power for a Straight IO 550- is only 29 gph or so..
One client of mine has a Cessna 421, GTSIO-520-H, and leans to 15 gph
each side...
Kent Felkins
Tulsa
Sent: Friday, November 02, 2012 6:50 AM
Subject: [LML] Why is my fuel burn so high in my IV
????
Reading some of the posts on the LML about IV/IVP drivers. Just
wondering how they are getting around 18-19 GPH at cruze power?
I
have a straight IV with a TSIO-550-B. I usually fly around 10K feet, using 28in
MAP, 2400 RPM, Leaning to 1550 TIT, and getting 21.5 GPH fuel
burn.
What am I doing wrong? How is everyone else getting there
fuel flow so much lower?
Any advice would be much
appreciated.
Thanks,
Guy
Foreman
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