X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from poplet2.per.eftel.com ([203.24.100.45] verified) by logan.com (CommuniGate Pro SMTP 5.3.5) with ESMTP id 4216360 for flyrotary@lancaironline.net; Fri, 09 Apr 2010 23:03:51 -0400 Received-SPF: none receiver=logan.com; client-ip=203.24.100.45; envelope-from=lendich@aanet.com.au Received: from sv1-1.aanet.com.au (mail.aanet.com.au [203.24.100.34]) by poplet2.per.eftel.com (Postfix) with ESMTP id C51581738DD for ; Sat, 10 Apr 2010 11:03:13 +0800 (WST) Received: from ownerf1fc517b8 (203.171.92.134.static.rev.aanet.com.au [203.171.92.134]) by sv1-1.aanet.com.au (Postfix) with SMTP id 2B2B2BEC003 for ; Sat, 10 Apr 2010 11:03:11 +0800 (WST) Message-ID: <4958718B55A148EF8B5DDD54F2063892@ownerf1fc517b8> From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Tuned lengths Date: Sat, 10 Apr 2010 13:03:12 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0010_01CAD8AE.2CFB5B60" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5843 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 X-Antivirus: avast! (VPS 100409-1, 04/09/2010), Outbound message X-Antivirus-Status: Clean This is a multi-part message in MIME format. ------=_NextPart_000_0010_01CAD8AE.2CFB5B60 Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable 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=20 On Fri, Apr 9, 2010 at 8:31 PM, Mark Steitle = wrote: Bill,=20 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. ;-)=20 Mark On Fri, Apr 9, 2010 at 12:36 PM, Al Gietzen = 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.=20 Where did you get the tubes to weld-up? I=92m planning on making = a casting myself but it would nice to know alternate sources. Bill; I don=92t recall where I got the tube =96 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 =96 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=94 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=92ll have to check. That=92s a real deal =96 by the time I had mine = fabricated and heat treated it was over $2000. Let me know if anyone is = interested. Al ------=_NextPart_000_0010_01CAD8AE.2CFB5B60 Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable
Tracy and Mark,
The old Powersport had a throttle body = in close to=20 the port, I believe this will still be available, but modified to be = easily=20 fitted, as well as the slide throttle.
When ? I don't know!
I guess there's a lot to do until = designs are=20 coming of the production line.
George ( down under)
"One=20 nice thing about the p-port motor is that the intake is super simple = make.=20  Of course, you've got to build a slide throttle.  ;-)=20 "

Just curious Mark, are you just kidding or do you really = think=20 the slide throttle is a necessity?    When and if I ever = build a=20 P-Port engine I'll use a standard throttle body.  I don't see a=20 significant advantage to the slide throttle. It's still too far away = from the=20 inner port entrance to help the idle.  With a conservative port = timing=20 the idle is OK for aircraft use anyway.  Richard's  P Port = idled OK=20 using a carburetor and it was a one rotor which has a even harder time = at=20 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=20 simple make.  Of course, you've got to build a slide throttle.=20  ;-) 

Mark

On Fri, Apr 9, 2010 at 12:36 PM, Al Gietzen = <ALVentures@cox.net> wrote:

My=20 understanding is that one advantage to using individual throttles = as you=20 did was that it mitigated the effect of pulses between the intakes = and=20 tuning became less critical.

Where=20 did you get the tubes to weld-up?  I=92m planning on making a = casting=20 myself but it would nice to know alternate = sources.

Bill;

I = don=92t recall=20 where I got the tube =96 there are a number of vendors.  I = think I=20 bought U-bends which were then cut and welded. The tube size was = chosen to=20 have a circumference close to match that of the ports.  The=20 fabricator then made mandrels to shape the tubes to match the = ports =96 then=20 welded into the water-jet cut flange.

 

Al

 

 

 

From:=20 Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Al = Gietzen
Sent: Thursday, April=20 01, 2010 = 5:06=20 PM
To: Rotary motors in=20 aircraft
Subject:=20 [FlyRotary] Tuned lengths

 

To:=20 Rotary motors in aircraft
Subject: [FlyRotary] Re: = Tuned=20 lengths

 

Please = post=20 drawings/photos/specs...Yvon

 

Some photos=20 of the intake manifold for the 20B are attached. It is 4.5=94 = from flange=20 to flange; the TB flange is at a slight angle to fit my = installation;=20 the TB is TWM 3003; 44mm diameter bores.

 

Another=20 builder built his from my drawings and had a couple extra = made.  At=20 least one is still available. The price is around $1000; I=92ll = have to=20 check. That=92s a real deal =96 by the time I had mine = fabricated and heat=20 treated it was over $2000.  Let me know if anyone is=20 interested.

 

Al

=

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