X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from p3plsmtpa01-10.prod.phx3.secureserver.net ([72.167.82.90] verified) by logan.com (CommuniGate Pro SMTP 5.3.5) with SMTP id 4216271 for flyrotary@lancaironline.net; Fri, 09 Apr 2010 20:36:32 -0400 Received-SPF: none receiver=logan.com; client-ip=72.167.82.90; envelope-from=aviator@stinsonvoyager.com Received: (qmail 26412 invoked from network); 10 Apr 2010 00:35:57 -0000 Received: from unknown (76.88.64.229) by p3plsmtpa01-10.prod.phx3.secureserver.net (72.167.82.90) with ESMTP; 10 Apr 2010 00:35:57 -0000 From: "Bill Monroe" To: "'Rotary motors in aircraft'" References: In-Reply-To: Subject: RE: [FlyRotary] Re: Tuned lengths Date: Fri, 9 Apr 2010 17:35:25 -0700 Message-ID: <003b01cad845$b6e27d40$24a777c0$@com> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_003C_01CAD80B.0A83A540" X-Mailer: Microsoft Office Outlook 12.0 Thread-Index: AcrYRUEZYvusi0m+SJaAa2rIuer8kAAABH8w Content-Language: en-us This is a multi-part message in MIME format. ------=_NextPart_000_003C_01CAD80B.0A83A540 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Ya, I considered it for a bit. You don't *have* to have a slide throttle but in the end, I can make a cast manifold and the throttle bodies easily, but not the P-Port mods. A man's got to know his limitations... From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Mark Steitle Sent: Friday, April 09, 2010 5:32 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Tuned lengths 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 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 ------=_NextPart_000_003C_01CAD80B.0A83A540 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Ya, I considered it for a bit.  You don’t = *have* to have a slide throttle but in the end, I can make a cast manifold and the = throttle bodies easily, but not the P-Port mods.

 

A man’s got to know his = limitations…..

 

From:= Rotary = motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Mark = Steitle
Sent: Friday, April 09, 2010 5:32 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Tuned lengths

 

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

 

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