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[FlyRotary] Re: Ellison vs EFI
Yes I lost top end power going to
the 48 and the most noticeable loss was at high alt, the 48 did
improve idle and works much better for slow speed water taxiing and it
don't fowl the plugs when taxiing around slow which I do a lot of as I
use my plane as a motor boat also however the reason I switched was
that my 51 was in the fire a few years back if you remember and at the
time there were no 51's available so I went to the 48.
Ken
Ken, so you are verifying that you lost
power when you went from two 51mm bores to two 48mm bores?
(51mm = ~13.11 sq in; 48mm = ~11.21 sq in; so a 48mm bore is ~ 15%
smaller than a 51mm bore). Did you go with the smaller bores to
improve idle?
Thanks, Ken Powell
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Hp don't mean anything as its all
in CFM and at that time tne biggest they offered was 350 CFM which
will work fine on the big lunged ancient airplane motors but we need
free high flowing carburetors, about 650 to 700 CFM is about
right.
I'm not following you
here. Why is 180 HP more CFM for us than for an
O-360? I
just sent them a question to see what the bore diameter is on the top
3 sizes they list.
I did notice that there
was a FAQ on the Ellison page that says they don't recommend auto
fuel, since it could damage components in the TBI. I'm not sure
how much this is real, vs CYA. Ellison doesn't seem all that
much in favor of auto engine conversions in the first
place.
Rusty (already talked
to Van's once today, danger, danger)
Look at the crude intake
manifold on a Lycosoris, it don't have any CFM ether as they just rely
on the big slow moving piston to suck like hell to get the air in,
very crude !!!
I am currently running a 48
Weber, I did have a 51 Weber and there was a definite loss in power
dropping to the 48.
There are ways to control the
mixture on a Weber if interested.
I am considering playing with
fuel injection but I plan on using a Weber as the throttle body so the
if anything goes wrong with the injection I can just flip a switch and
change over to the carb.
Ken
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