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I agree Richard. I often think of your results. I would love to move the butterfly to the plenum. There is so much to learn now. You have built the first running engine (not counting Power Sport who does not share data) and your results are contrary to popular wisdom. I have seen a number of cars with P ports and carbs mounted on little 9 inch long inlet tubes that certainly do have EXCELLENT throttle response. Their idles were smooth enough too. Wish my engine was on the test stand now instead of just talking about it. Jerry
On Monday, March 21, 2005, at 10:53 PM, Richard Sohn wrote:
Jerry,
your injector problem may go away when you find out that the close-up butterfly may not be must as much as it is published. I went through that the whole way.
Richard Sohn
N-2071U
----- Original Message ----- From: "Jerry Hey" <jerryhey@earthlink.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Monday, March 21, 2005 4:36 PM
Subject: [FlyRotary] Re: P port intake design
Ed, you are right on all counts. Space and Ease of fabrication and the idea of cold side fuel all play a part. If I go to an injector close the the butterfly such as Power Sport is doing, then I will have to go to a single injector as there is not room down there for two. I like using two injectors if I can. P ports (if the runners are not too large) can generate some howling velocities, probably more than an intake with four runners, that I hope will help with the throttle response. But we shall see. This is an experiment and I will change what does not work. Jerry
On Monday, March 21, 2005, at 07:08 PM, Ed Anderson wrote:
No error Jerry, but wonder why are you putting the injectors so far away
from the port? Space? Ease of fabrication? I tried putting my four
injectors 21 inches away from the port myself and found that while I could
not tell any difference in power( up or down), I found a distinctive
hesitation bog if I opened the throttle quickly. Also it was hell to start
on a cold morning. But, a PP port may be a different animal in those
regards - actually cold starting should be OK as any liquid fuel will flow
down hill. With my plugs up it has to flow up hill {:>).
Good luck, we are all eagerly awaiting the results and I have two almost new
rotor housings just waiting.
Ed Anderson
----- Original Message -----
From: "Jerry Hey" <jerryhey@earthlink.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Monday, March 21, 2005 6:34 PM
Subject: [FlyRotary] P port intake design
I've been messing with the p port intake design. I think it is about
ready to build. If anybody sees a glaring stupidity or even a subtle
one, please let me know.
Still to be resolved is which injectors to use. Tracy, do you have
any suggestions? Using the 80 per cent rule, I need injectors for
around 260 hp. Thanks Jerry
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