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From: "George Lendich" <lendich@optusnet.com.au>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-1001521@logan.com>
Subject: Re: [FlyRotary] Re: Manifold Thoughts - 6 to 4 ports
Date: Wed, 15 Jun 2005 08:21:46 +1000
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> George Lendich wrote:
>
> >.  I've been studying this idea for a while.  Looking through
> >
> >
> >>another list, there is a poster named "Judge Ito" that everyone seems to
> >>revere for his porting prowess.  His take on opening up and combining
> >>the 6 to make it only 4 ports would give it the top end power of a
> >>peripheal port, but would severely compromise the low end power and
> >>idle.  As Bill alluded to earlier, who cares.
> >>
> >>I'm still building fuselage ribs, but in a few weeks I'll be digging a
> >>lot harder to nail down this will actually work, as I begin to build an
> >>intake manifold.
> >>
> >>
> >
> >Ernest,
> >I would have to agree entirely - so why not make it real simple and make
a
> >PP.
> >George ( down under)
> >
> >
> >
> >
>
> That's a seems like a little bit more of a R&D program than I want to
> take on right now, George (and I'm fully aware that the difficulty may
> be more perception than reality).  I'm confident that I can handle a
> porting job, as I've had to do a lot of metal 'sculpturing' to fit all
> these tubes together.  Now, it's just a question of what to cut away for
me.
>
> I believe the same thing is said about a PP that is said about what I
> think I'd like to do...rough idle and no low-end power.  Am I correct
> that the solution is short runners with a closely fitted throttle?

Ernest,
I still think that Jerry's approach is the correct one for us, or me anyway.
1.5" ID approx tuned ( approx 18" to 22") runner.
PL is getting very good results with the 2" OD -PP ( 27" runner carby
set-up).
The slide throttle is not sufficiently sealed ( yet) - which it must be!!
The 2" OD is realising some high HP numbers and if you need that HP you use
that sized PP.
No answer yet on idle, except that Richard Sohn is running quite nicely at
low RPM ( yes it's PP).
Lyn Hanover is confident on the performance of the PP.

The bottom line is don't discount it, it's a simple operation and I'm sure
Jerry will do it for you if you feel not confident in doing it yourself.

We will get some feed-back soon enough from PL and Jerry. Your HP numbers
WILL be up there and as for the idle and low end, it won't be any worse!
George ( down under)