What model Ellison are you using?

"Ron Webb" wrote in message
...
Yea...That's true. A big engine with low RPM and short, straight intake
runners can take air in gulps, instead of a smooth flow, and the flow at
peak gulp can be quite a bit higher than the average.

Now, a Lyc 0-360 is big and slow certainly, but the intake runners are not
straight, the air is gulped into a plenum, and drawn out of the plenum and
into the cylinders after much misdirection. I'd expect that is enough to
eliminate most of the "gulp effect".

But, I guess you already said that.

The point I was making stands, though. An Ellison throttle body designed
for 180 horses works fine on an O-360. Actually, mine has 10:1 pistons and
a few other mods (including the Ellison throttle body itself) that make it
around 220 HP.



clare at snyder.on.ca wrote in message
...
On Tue, 30 May 2006 15:59:26 -0800, "Ron Webb"
wrote:

I have an Ellison 4/5 on a modified O-360. Works fine. A very high
quality
unit.

As for the difference between a 180 HP Lyc, and a 180 HP Sub...both are
ingesting about the same amount of air, to make the same horsepower
numbers,
so the same size carb would be necessary. The Sub is smaller, running
faster, the Lyc is big and slow, but both pump about the same amount of
air.




In most cases you are right - and in this case likely close enough.
However, depending on the intake system, the big engine MAY require a
larger carb, as it "gulps" the air in larger slugs. Say you have a 4
liter 4 cyl, and a 2 liter 4 cyl engine. The 4 liter engine grabs a
liter at a time, while the 2 liter only grabs half a liter at a time,
so instantaneous (peak) airflow on the 4 liter is higher than on the 2
liter. On larger than 4 cyl engines, it is not an issue (practically)
because of the overlap, and on smaller (1, 2, or 3 cyl) engines it is
more noticeable because the flow drops off more between gulps.


"ADK" wrote in message
news:hG4fg.1785$S61.588@edtnps90...
I would like to hear from anyone with experience with this unit, good or
bad. I would also like to know if their sizing as it is printed on their
website, is accurate. I don't know if engine efficiency is a factor in
the
sizing, for instance, does a 180 hp Lycoming require the same size
throttle
body as a 180 hp Subaru engine. They are both producing 180 hp, but with
grossly different displacements. I have written the company but they
don't
seem to be interested in returning email.




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