Newps wrote:



Ray Andraka wrote:

Newps wrote:



Jay Honeck wrote:


Do I? Hell, no! I cruise at 140 knots, at 15 gph.




Ouch.


Jay, I thought book cruise fuel burn for a 235 was about 12 GPH. Why
are you burning 15? Book for my Six is 14 GPH, and I would be getting
that if I wasn't fighting the front two cylinders running so lean with
WOT. Sounds to me like a move up to a Six wouldn't be as painful as
you made it out to be the other day. So are we going to see you show
up at OSH in a six this year then?




Running 15 gph for a 235 hp engine is a colossal waste of gas at cruise
speed. My 285 hp engine(IO-520) gets 75% at 14 gph.

Book burn for my 260 hp O-540 is 14 gph. Both mine and Jay's are
carbureted, so we end up with a wider spread between cylinders, which in
turn means we lean to the leanest cylinder and accept the fuel burns of
the others. I've currently got an issue I am trying to track down with
mine that is making the front two cylinders reach peak EGT some 270-300
degrees before the others, which in turn is making my fuel burn close to
19gph (no, it isn't an induction leak, we've pressurized the intake and
checked it, plus the problem is most noticible at WOT on cold days. If
it were an intake leak, it would be accentuated at lower throttle
settings rather than higher ones). Previously, I used to get EGT
spreads around 150 deg and was getting fuel burns pretty close to the
14gph book value. I don't know why Jay is burning 25% more than book,
and am curious if he knows why (or maybe it was a typo?).