Return-Path: Received: from web41522.mail.yahoo.com ([66.218.94.129] verified) by logan.com (CommuniGate Pro SMTP 4.3c3) with SMTP id 810940 for flyrotary@lancaironline.net; Fri, 18 Mar 2005 20:28:30 -0500 Received-SPF: none receiver=logan.com; client-ip=66.218.94.129; envelope-from=tomtugan@yahoo.com Received: (qmail 19353 invoked by uid 60001); 19 Mar 2005 01:27:46 -0000 Comment: DomainKeys? See http://antispam.yahoo.com/domainkeys DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; b=u1TG99FWVD+AOZpbCxCIEWoLDl+udu1oL63GYdly3+tXJZHbN3ZcpStQY5GctF4uUvXCXnrNEOqVz7Chx6dDpB7ExC6yezl8Zb/ECvKRiLK7t16q/QqukpV842f9GJTWcEW8Klx3RhZ/aI7jVMssnsRfGGJcjgWA6SqeC7gnHXQ= ; Message-ID: <20050319012746.19351.qmail@web41522.mail.yahoo.com> Received: from [168.103.95.245] by web41522.mail.yahoo.com via HTTP; Fri, 18 Mar 2005 17:27:46 PST Date: Fri, 18 Mar 2005 17:27:46 -0800 (PST) From: Tom Subject: Re: [FlyRotary] Re: Intake Ideas.... To: Rotary motors in aircraft In-Reply-To: 6667 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="0-712288289-1111195666=:19278" --0-712288289-1111195666=:19278 Content-Type: text/plain; charset=us-ascii Hi Dale, 20 inch runners are contrary to the experience of Tracy and Paul. Both found that going from long to short runners made a noteworthy improvement in performance. The pics I've seen of the Atkins intake, like Paul's, has fairly short runners. I know sucking on short straws is easier than sucking on long straws, sucking without a straw is even easier. Other than allowing a single throttle-body to feed multiple ports and being an approach to address possible airflow confusion, I'm questioning the necessity of runners. I see I'm not the first to raise the question and maybe the only one who doesn't know the answer. I wanna know if its just a matter of unquestioned precedence but not really necessary. It's something else I'd like to try. Tom Dale Rogers wrote: Tom, It would _run_ ... but you would be giving away an important benefit derived from having 20 or so inches of individual runners: maximum fill of the combustion chamber at 6000 RPM. I'm building an NA, so *I* can't afford to give that away on my engine. Dale R. > ----- Original Message ----- From: Tom > > > Imagine taking their plenum, cutting off the runners, and then bolting this plenum onto the side of your motor over the intake ports without using runners. Where the ported ends of the runners appear on the inside of the plenum you have ported entries into your intake ports. Oh, and then use an Ellison as a throttle-body. Is this wrong? > >> Homepage: http://www.flyrotary.com/ >> Archive: http://lancaironline.net/lists/flyrotary/List.html --------------------------------- Do you Yahoo!? Yahoo! Small Business - Try our new resources site! --0-712288289-1111195666=:19278 Content-Type: text/html; charset=us-ascii

Hi Dale,

20 inch runners are contrary to the experience of Tracy and Paul. Both found that going from long to short runners made a noteworthy improvement in performance. The pics I've seen of the Atkins intake, like Paul's, has fairly short runners. I know sucking on short straws is easier than sucking on long straws, sucking without a straw is even easier. Other than allowing a single throttle-body to feed multiple ports and being an approach to address possible airflow confusion, I'm questioning the necessity of runners. I see I'm not the first to raise the question and maybe the only one who doesn't know the answer. I wanna know if its just a matter of unquestioned precedence but not really necessary. It's something else I'd like to try.

Tom

Dale Rogers <dale.r@cox.net> wrote:

Tom,

It would _run_ ... but you would be giving away an
important benefit derived from having 20 or so inches
of individual runners: maximum fill of the combustion
chamber at 6000 RPM.

I'm building an NA, so *I* can't afford to give that
away on my engine.

Dale R.

> ----- Original Message ----- From: Tom
>
>
> Imagine taking their plenum, cutting off the runners, and then bolting this plenum onto the side of your motor over the intake ports without using runners. Where the ported ends of the runners appear on the inside of the plenum you have ported entries into your intake ports. Oh, and then use an Ellison as a throttle-body. Is this wrong?
>

>> Homepage: http://www.flyrotary.com/
>> Archive: http://lancaironline.net/lists/flyrotary/List.html

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