| Bill,
Sure, I can try that, but it does run very well at 7000rpm, so I would think it is getting enough air. Also, the problem is only to rotor #1 (right side of picture). It would be good to eliminate the possibility of air starvation though.
Mark On Tue, May 29, 2012 at 4:23 PM, Bill Bradburry <bbradburry@bellsouth.net> wrote:
Mark,
Are you starving the back (#1 rotor) for
air? It seems you said you had a 4” scat tube feeding the
airbox. That is 12.56 sq in. divide that by three, divide that by
3.14, take the sq root, and you come up with 1.15 diameter for your
runners. You probably have runners of 2” or so. They may require
more air than the scat tube can deliver???
Remove the airbox and see what happens??
B2
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Mark Steitle
Sent: Tuesday, May 29, 2012 4:49
PM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: Injector
balancing
Ernest,
I don't understand how that could happen if my injectors are after the
airbox (see attached pic).
Mark
On Tue, May 29, 2012 at 1:23 PM, Ernest Christley <echristley@att.net>
wrote:
Mark Steitle wrote:
> Ernest,
>
> Not sure you intake and mine are very similar. I assume that you
have a
> single TB. Since I'm running a p-port motor, I needed to have the
> throttle plates as close to the intake ports as possible. So, I'm
> running three separate 46mm throttle bodies. The primary injectors
are
> between the butterflies and the intake ports. The primary injector
> bungs are cast into the TB's. They share a 1-piece throttle shaft.
>
> The secondary injectors are located further out on the runners ahead of
> the butterflies. Each runner connects to a single airbox. The
#1
> intake is at the rear of the airbox, #2 in the middle, and #3 in the
> front. Air is fed in from the front corner with a 4" SCAT.
I could
> test your theory by removing the airbox. This would make all three
> intake runners identical. May be worth a try.
>
For the purposes of my theory, your setup is nearly identical to what I
started with. The air came in the front, blew
past the first rotor, and the rotor in the back wound up with its fuel and part
of the front's. The plate I put in made
it so that the incoming air did not blow past the front rotor's intake toward
the second. Instead, it now has to
pressurize the manifold, and then roll around the plate to approach both
runners directly. I had idle EGT differences
of 400* to 500*, and only evened out when the speed got really fast. They
now hang within 100* at idle, and are dead
even over 2000rpm.
Verifying even flow is a necessary exercise, but from your description I
strongly suspect that you have a pressure
distribution problem in your plenum.
|