|
Tracy and Mark,
The old Powersport had a throttle body in close to
the port, I believe this will still be available, but modified to be easily
fitted, as well as the slide throttle.
When ? I don't know!
I guess there's a lot to do until designs are
coming of the production line.
George ( down under)
"One
nice thing about the p-port motor is that the intake is super simple make.
Of course, you've got to build a slide throttle. ;-)
"
Just curious Mark, are you just kidding or do you really think
the slide throttle is a necessity? When and if I ever build a
P-Port engine I'll use a standard throttle body. I don't see a
significant advantage to the slide throttle. It's still too far away from the
inner port entrance to help the idle. With a conservative port timing
the idle is OK for aircraft use anyway. Richard's P Port idled OK
using a carburetor and it was a one rotor which has a even harder time at
idle.
Tracy
On Fri, Apr 9, 2010 at 8:31 PM, Mark Steitle <msteitle@gmail.com> wrote:
Bill,
One nice thing about the p-port motor is that the intake is super
simple make. Of course, you've got to build a slide throttle.
;-)
Mark
On Fri, Apr 9, 2010 at 12:36 PM, Al Gietzen <ALVentures@cox.net> wrote:
My
understanding is that one advantage to using individual throttles as you
did was that it mitigated the effect of pulses between the intakes and
tuning became less critical.
Where
did you get the tubes to weld-up? I’m planning on making a casting
myself but it would nice to know alternate sources.
Bill;
I don’t recall
where I got the tube – there are a number of vendors. I think I
bought U-bends which were then cut and welded. The tube size was chosen to
have a circumference close to match that of the ports. The
fabricator then made mandrels to shape the tubes to match the ports – then
welded into the water-jet cut flange.
Al
From:
Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Al Gietzen
Sent: Thursday, April
01, 2010 5:06
PM
To: Rotary motors in
aircraft
Subject:
[FlyRotary] Tuned lengths
To:
Rotary motors in aircraft
Subject: [FlyRotary] Re: Tuned
lengths
Please post
drawings/photos/specs...Yvon
Some photos
of the intake manifold for the 20B are attached. It is 4.5” from flange
to flange; the TB flange is at a slight angle to fit my installation;
the TB is TWM 3003; 44mm diameter bores.
Another
builder built his from my drawings and had a couple extra made. At
least one is still available. The price is around $1000; I’ll have to
check. That’s a real deal – by the time I had mine fabricated and heat
treated it was over $2000. Let me know if anyone is
interested.
Al
|