Return-Path: Received: from [24.25.9.100] (HELO ms-smtp-01-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.1.6) with ESMTP id 2704530 for flyrotary@lancaironline.net; Fri, 31 Oct 2003 11:37:35 -0500 Received: from o7y6b5 (clt78-020.carolina.rr.com [24.93.78.20]) by ms-smtp-01-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id h9VGbVQU013891 for ; Fri, 31 Oct 2003 11:37:33 -0500 (EST) Message-ID: <000f01c39fcc$c7309320$1702a8c0@WorkGroup> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Intake manifold Date: Fri, 31 Oct 2003 11:33:55 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_000C_01C39FA2.DDC37B40" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_000C_01C39FA2.DDC37B40 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable =20 Also for my plans for a variable intake manifold, two tubes are much = easier to deal with than four. If I could have figured out a way to = handle 4 tubes sliding I probably would have stayed with the four tubes. = However, for my turbo block, I decided the simplicity of using two = tubes (combining primary and secondary) outweighed any disadvantage - I = may prove myself wrong about that conclusion, but nothing ventured - = nothing gained. Ed Anderson A 12A race engine with a big bridge port and very short intake = runners, for best power at 9,400 RPM still makes 173.3 HP at 6,500 RPM. = SNIP With a 13B it seems to me that this could be done with not as near as = much effort as is being expended here. There is a plenum below the carb = that combines the two runners. Adjusting the plenum volume changes the = torque peak. I think the runner length is from the plenum to the block = face.=20 There is little volume involved, and not much of a change is possible = without shortening the runners.=20 So, the two into four runner idea should work fine. The effect may be = even more pronounced than the four runner option.=20 Lynn E. Hanover =20 Thanks for the additional insight, Lynn I intend to give it a try, but always nice to hear from someone = with your experience indicate that it just might work {:>) Ed Anderson ------=_NextPart_000_000C_01C39FA2.DDC37B40 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
 
Also for my plans for a variable intake manifold, two = tubes are=20 much easier to deal with than four.  If I could have figured = out a way=20 to handle 4 tubes sliding I probably would have stayed with the four = tubes.  However, for my turbo block, I decided the simplicity = of using=20 two tubes (combining primary and secondary) outweighed any = disadvantage - I=20 may prove myself wrong about that conclusion, but nothing ventured - = nothing=20 gained.

Ed Anderson



A 12A race engine = with a big=20 bridge port and very short intake runners, for best power at 9,400 RPM = still=20 makes 173.3 HP at 6,500 RPM.  SNIP

With a 13B it seems to = me that=20 this could be done with not as near as much effort as is being = expended here.=20 There is a plenum below the carb that combines the two runners. = Adjusting the=20 plenum volume changes the torque peak. I think the runner length is = from the=20 plenum to the block face.
There is little volume involved, and not = much of=20 a change is possible without shortening the runners.

So, the = two into=20 four runner idea should work fine. The effect may be even more = pronounced than=20 the four runner option.

Lynn E. Hanover 
 
Thanks for the additional insight, = Lynn
 
    I intend to give it a try, but = always=20 nice to hear from someone with your experience indicate that it just = might=20 work {:>)
 
Ed = Anderson
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