X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-vw0-f52.google.com ([209.85.212.52] verified) by logan.com (CommuniGate Pro SMTP 5.3.5) with ESMTP id 4216336 for flyrotary@lancaironline.net; Fri, 09 Apr 2010 22:03:42 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.212.52; envelope-from=rwstracy@gmail.com Received: by vws11 with SMTP id 11so838724vws.25 for ; Fri, 09 Apr 2010 19:03:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:sender:received:in-reply-to :references:date:x-google-sender-auth:received:message-id:subject :from:to:content-type; bh=jrrJIbcJQDAwdSAYgYflCswQ8Np52s9bri8+Re6/NAA=; b=mdcio7V7Zbdx3BoCds9zrZUJzdPLA28BHaOn3+9n1jD/l7wux03em7rXRa3hpXFTnF vJ9EG7C98fUzvIVTSSJAwqCYpdRTRi66vExHV0JO0/7b88WOMLX2AWqd488AT7JyKiYh 27xvXPTM2O48rkyQ5egl4gZaMOv1qMxBpRRBc= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:sender:in-reply-to:references:date :x-google-sender-auth:message-id:subject:from:to:content-type; b=x/ob4hBMXCYW9inGAECmYT90NhtH3DB4yRM6eSLaNyi1F81BUjCPjQoYaEHv2hMStn SejWXWmQ2f2SPOHCpZ8k3BcVU7lmg3bIU5CrRUdC/kfVy9z+VIX1KDCnnVesVp7F60qU HrNmGgveOlvhSmqh7r77rvC3qXckuPIOY2ls4= MIME-Version: 1.0 Sender: rwstracy@gmail.com Received: by 10.220.163.72 with HTTP; Fri, 9 Apr 2010 19:03:06 -0700 (PDT) In-Reply-To: References: Date: Fri, 9 Apr 2010 22:03:06 -0400 X-Google-Sender-Auth: 1c5fc63496906c9a Received: by 10.220.122.28 with SMTP id j28mr480121vcr.167.1270864986239; Fri, 09 Apr 2010 19:03:06 -0700 (PDT) Message-ID: Subject: Re: [FlyRotary] Re: Tuned lengths From: Tracy Crook To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary=0016369c8f9b0ff40b0483d8509a --0016369c8f9b0ff40b0483d8509a Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable "*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 hel= p 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 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 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 a= nd >> tuning became less critical. >> >> Where did you get the tubes to weld-up? I=92m planning on making a cast= ing >> 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 he= at >> treated it was over $2000. Let me know if anyone is interested. >> >> >> >> Al >> >> > --0016369c8f9b0ff40b0483d8509a Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable "One nice thing about the p-port motor is that the intake is super = simple make. =A0Of course, you've got to build a slide throttle. =A0;-) "= ;

Just curious Mark, are you just kidding or do you really think= the slide throttle is a necessity? =A0=A0 When and if I ever build a P-Por= t engine I'll use a standard throttle body.=A0 I don't see a signif= icant advantage to the slide throttle. It's still too far away from the= inner port entrance to help the idle.=A0 With a conservative port timing t= he idle is OK for aircraft use anyway.=A0 Richard's=A0 P Port idled OK = using a carburetor and it was a one rotor which has a even harder time at i= dle.

Tracy


On Fri, Apr 9, 2010 at 8:3= 1 PM, Mark Steitle <msteitle@gmail.com> wrote:
Bill,=A0

One nice thing about the p-port motor is that t= he intake is super simple make. =A0Of course, you've got to build a sli= de throttle. =A0;-)=A0

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 di= d 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?=A0 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.=A0 I think I bought U-bends which were then cut and welded. The tube size was chosen to have a circumfe= rence close to match that of the ports.=A0 The fabricator then made mandrels to shape the tubes to match the ports =96 then welded into the water-jet cut flange.

=A0=

Al<= /font>

=A0

=A0

=A0

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 aircr= aft
Subject: [FlyRotary] Tuned= lengths

=A0

To: Rotary motors in aircraft
Subject: [FlyRotary] Re: T= uned lengths

=A0

Please post drawings/photos/specs...Yvon

=A0

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.

=A0

Another builder built his from my drawings and had a couple extra made.=A0 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.=A0 Let me know if anyone is interested.

=A0

Al



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