I'm with Ken ! I don't have the fancy electronic ignition,
just stock mags & carb, on my O-320E2D. It burns 8 gph
at 2,450 rpm, and is very happy there. On a previous Ramble,
I ran it at 2,350 - it burns about 1 gph less, and is reasonably
happy there, but 2,250 or 2,100 are not so good ... it seems
rough, and get harder to start. There's no question that the
old Continental O-300 6 cyl burns less fuel....
On the subject of fuel .... On Ramble 2007, we flew out to
the West Coast, and back to Oshkosh. This involved a lot
of flying in 95 - 100 + F. temperatures, through the mountains,
from airports near 4,000 ft. ASL. We all carried 2 passengers,
and camping gear. I put $2,630 worth of 100 LL in my O-320
(those were lower prices back then ...). The Rebel with the
80 hp. Rotax 912 used about $880 worth of mogas, the Rebel
with the 100 hp. Rotax 912 used about $1,100 worth, and
I believe the Rebel with the Subaru 2.2L used about $1,200 - $1,300
worth of mogas .... SO -- we all got there, and it cost me over
DOUBLE the gas.... Yes, I could carry a bit more weight, and
climb a bit faster sometimes (although the Subaru wanted to
pass me !), and cruise a bit faster ....
My NEXT Rebel will have a 100 hp. Rotax 912, and might
go on 1500 Murphy amphib floats....
I think Tom summed it up quite nicely - he said (approximately):
"I chose the Rotax 912 because I couldn't think of anywhere I
wanted to go that quickly that was worth the extra fuel ! "
--
......bobp
bobp@prosumers.ca
http://www.prosumers.ca/Ramble09
http://bpatterson.qhealthbeauty.com
http://apatterson2.qhealthzone.com
http://apatterson2.ordermygift.com
-------------------------------orig.-------------------------
On Friday 14 November 2008 19:09, Ken wrote:
I've heard guys say this many times and it is no doubt true in some
circumstances. The other side seems to be that the same guys rarely
seem to cruise at such low power. I think it is a combination of
roughness from one cylinder going lean first, plug fouling from low
temperatures, or maybe they just like to go fast?? My neighbor's 0-320
just won't run smoothly below 8+ gph. Anyway I wouldn't count on being
able to do it with a carb, standard intake system, and magnetos. I
believe that matched injectors, one or two electronic ignitions with
advance, and mogas will all help at low power.
Ken
Keith Leitch wrote:Sorry, I don't mean to get off track on your post. If you have an
O-200 I can understand your question. But as far as the others, I
personnally don't see much sense in using the O-235/IO-240 unless you
have access to one for cheap. I have an O-235 L2C I had thought about
installing in my Rebel (whenever I get to that point) but after
looking at the weight vs. the O-320 it is sensless to me. May as well
use the O-320 and if you are worried about fuel....that little thing
called the throttle can easily be pulled back. I recently was on a 5+
hour tour with a bunch of Super Cubs and I was flying my O-300
powered 172. Flying at their speeds I burn a little over 5 gph. I
guess what I am trying to say is it is nice to have the HP when you
need it....just don't have to use it all the time if you are
concerned with fuel prices. I am waiting for Ron to get his Jabiru
powered Rebel flying so I can get a report. :) The power to weight
ratio may be an option for me since I will be on floats/skis the
majority of the time. Keith R661
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