RE Small vs larger intake runners, this argument has been going on
forever. It is pointless in my opinion. Once we have engines in
both configurations all will be known. In the meantime either p port
promises a lot more hp than a stock intake. Small p port intakes
produce 215 hp at around 6400 rpm. They would produce even more at
7500 rpm. Bigger intakes will produce even more power. But since
both are limited to 7500 rpm, the increase will not be that
significant. The best street ported engines are not claiming 200
hp. For a stock intake, pray for 150 hp. It will take a miracle.
I have built a number of intakes to augment my scrap pile. There is
a world of difference trying to wrap a 2" O.D. pipe over the top as
compared to 1.75 o.d. Most airplanes will not have room above the
engine for a 2" o.d. system. Remember that 2" bends are not
available in the same radius as 1.75 tubes. Space is more important
than potential performance in making the decision. Inside an
airplane cowl, there is seldom room for a proper intake or exhaust.
Jerry
Read this chart again Jerry. You did get it did you not?
Note the torque severely dropping off at 6100 RPM. That means the HP
on this 1 3/4 tube P-port engine will also start to go down from here.
Your experience in this matter has been limited to Tailwinds.
Most RV's have plenty room above the engine for a 2 inch 180
degree bend intake. All the pushers have no problems.
I know! I have literally done dozens of scaled
3D dwgs on this subject. Same goes for a Mustang II. I would say
with a very few exceptions a 180 degree 2 inch tube bend fits fine.
Furthermore one is not limited to going over the top.
See the last 3 3D's.
I thought I had you convinced on this years ago :)
Paul Lamar ...No rotor no motor.
I choose not to argue because I cannot win. More importantly, I am
glad you revived the side intake pipe drawings. Can you plug in a couple
of Mikunis? Thanks, Jerry
Yes I think so. Looks like there is enough room to squeeze them in.
I would like to test them on the dyno and come up with a way of
leaning them first. I am not going to buy two 48 mm Mikuni's at $450 each.
If I can't promote a couple from Mikuni USA I won't do it. Unless of
course somebody loans me a couple for testing. I am not interesting in using
smaller ones as that is a step back IMHO. We have a Weber 58 we can
use on the RX8 p-port dyno engine.
Paul Lamar ...No rotor no motor.
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