X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-bw0-f224.google.com ([209.85.218.224] verified) by logan.com (CommuniGate Pro SMTP 5.3.2) with ESMTP id 4123894 for flyrotary@lancaironline.net; Sat, 13 Feb 2010 11:10:06 -0500 Received-SPF: pass receiver=logan.com; client-ip=209.85.218.224; envelope-from=lehanover@gmail.com Received: by bwz24 with SMTP id 24so1432288bwz.9 for ; Sat, 13 Feb 2010 08:09:29 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:date:message-id:subject :from:to:content-type; bh=zx/HB4+u6uN9gktvj+sTePFv7G7tR/xusT1R82cey9A=; b=lbjIdARmU3SDRLHzeyLw2Hg43upDZEeSPvK1skqeooH43ZVhtJh6jgx8Ht8i3kaYwU r8OLXZgtxvES+GMStq3joDVL3+FwIznoqhP0/OTofBdYL3f6XLhK+seeGpngyY8a0dw7 T9sAvJ+u2GYQt2vy3wCt0i5emuk3IP8xb8bEw= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:date:message-id:subject:from:to:content-type; b=EpbsL4AmpiLkkQhTqzETk1OmPOuYVf2jPFfnlNHNya1KcBOAah8dFtzZpBIwBZYhia FdRWPJ77Pnr2+2Fa85M3fOLF+P3uV0mot/jUZOx9P9DS13XDS92Ypf0HVUnInPWF4Rp9 ufY7KZb7YynPYc3D88dr+kaen+LaSKiyD+jKk= MIME-Version: 1.0 Received: by 10.204.129.82 with SMTP id n18mr1780383bks.132.1266077368110; Sat, 13 Feb 2010 08:09:28 -0800 (PST) Date: Sat, 13 Feb 2010 11:09:28 -0500 Message-ID: <1ab24f411002130809r24d1f198hcae18e9248730236@mail.gmail.com> Subject: Runner velocity From: Lynn Hanover To: flyrotary@lancaironline.net Content-Type: multipart/alternative; boundary=0015174765c0c8ce26047f7d9b93 --0015174765c0c8ce26047f7d9b93 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable http://home.earthlink.net/~mmc1919/venturi.html This is a free download of the Bernoulli Principal. Fun to play with and educational. The amount of fuel air entering the chamber is a function of runner cross section, velocity and time. The depression, or vacuum generated is a function of displacement and RPM. So the depression is about fixed by the 2606CCs and say, 6,000 RPM. The "M" in RPM is the time. So............ That leaves only Porting to increase intake open and closing time, (lengthe= n time period) and manufacturing the ideal intake runner set/ Throttle body combination. In my mind the runner size would be identical the the port opening for 4 to 6 inches out from the port opening. Then blend into one "D" shaped pipe for the 180 bend over the engine top. Then taper to a larger pipe of about 2 1/2" to blend into a plenum just big enough to fit the throttle body mounting plate. So, the cross section would be reduced gradually from the throttle body to the end of the "D" shape, then remain constant right up to the port opening= . I would upset the inside radius of the "D" shape with a number of burs stoo= d up with a three corner punch, to generate some tubulance.in order to keep flow attached. Just a guess. I could be completely wrong. Later, I tried a 75MM at one point and while it did nothing to improve engine power and performance, in my case it had an undesirable down side = =96 now to be fair it could have been partially the results of having all 4 injectors back near the throttle body =96 but in any case, if you suddenly opened the throttle like in a panic go-a-round =96 the engine would bog and hesitate for a fraction of a second (seemed like minutes {:>)), the engine never stopped, but I just didn=92t like it. So I went back to the 65mm. So the important thing is to match your induction system to your real operating regime =96 NOT what you would in your wildest dream like for it t= o be {:>). Ed Anderson You are only 70?? Run hard and put away wet comes to mind.............. Lynn E. Hanover --0015174765c0c8ce26047f7d9b93 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable
http://hom= e.earthlink.net/~mmc1919/venturi.html
=A0
This is a free download of the Bernoulli Principal. Fun to play with a= nd educational.
=A0
The amount of fuel air entering the chamber is a function of runner cr= oss section,=A0velocity and time.
=A0
The depression, or vacuum generated is a function of displacement and = RPM. So the depression is about fixed by the 2606CCs and say, 6,000 RPM. Th= e "M" in RPM is the time. So............
=A0
That leaves only Porting to increase intake open and closing time, (le= ngthen time period) and manufacturing the ideal intake runner set/ Throttle= body combination.
=A0
In my mind the runner size would be identical the the port opening for= 4 to 6 inches out from the port opening. Then blend into one "D"= shaped pipe for the 180 bend over the engine top. Then taper to a larger p= ipe of about 2 1/2" to blend into a plenum just big enough to fit the = throttle body mounting plate.
=A0
So, the cross section would be reduced gradually from the throttle bod= y to the end of the "D" shape, then remain constant right up to t= he port opening.
=A0
I would upset the inside radius of the "D" shape with a numb= er of burs stood up with a three corner punch, to generate some tubulance.in order to keep flow attached.
=A0
Just a guess. I could be completely wrong.
=A0
Later, I tried a 75MM at one poin= t and while it did nothing to improve engine power and performance, in my c= ase it had an undesirable down side =96 now to be fair it could have been p= artially the results of having all 4 injectors back near the throttle body = =96 but in any case, if you suddenly opened the throttle like in a panic go= -a-round =96 the engine would bog and hesitate for a fraction of a second (= seemed like minutes {:>)), the engine never stopped, but I just didn=92t= like it.=A0 So I went back to the 65mm.

=A0

So the importan= t thing is to match your induction system to your real operating regime =96= NOT what you would in your wildest dream like for it to=A0 be {:>).

=A0

Ed Anderson

=A0

You are only 70??

Run hard and put away wet comes to= mind..............

=A0

Lynn E. Hanover

<= /div>
--0015174765c0c8ce26047f7d9b93--