Return-Path: Received: from out007.verizon.net ([206.46.170.107] verified) by logan.com (CommuniGate Pro SMTP 4.1.6) with ESMTP id 2702823 for flyrotary@lancaironline.net; Thu, 30 Oct 2003 08:55:53 -0500 Received: from netzero.net ([4.4.58.190]) by out007.verizon.net (InterMail vM.5.01.05.33 201-253-122-126-133-20030313) with ESMTP id <20031030135552.BKYC1957.out007.verizon.net@netzero.net> for ; Thu, 30 Oct 2003 07:55:52 -0600 Message-ID: <3FA11865.4010307@netzero.net> Date: Thu, 30 Oct 2003 08:55:49 -0500 From: Finn Lassen User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.4) Gecko/20030624 Netscape/7.1 (ax; PROMO) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: Intake manifold References: In-Reply-To: Content-Type: multipart/alternative; boundary="------------090404050407020206090707" X-Authentication-Info: Submitted using SMTP AUTH at out007.verizon.net from [4.4.58.190] at Thu, 30 Oct 2003 07:55:51 -0600 This is a multi-part message in MIME format. --------------090404050407020206090707 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Ed, here's a highly theoretical question (as I have no plans to take apart my engine again): will street porting the 1986 NA narrow the intake runner length curves on the graph? On another note, I somehow have the idea that it's a bad idea to combine the runners. For example Jim Mosur had big problems splitting the water flow between his two radiators when he ran them in parallel. Tracy has argued that it doesn't matter because on an intake system you have a vacumn sucking in the air which would split it evenly. However, not so with the DIE pulses. I could even imagine that the pulse, preferring on path (one port) could even start to push out the air/fuel charge out the other port. Over to you... Finn Ed Anderson wrote: >> I believe (but have no data to support the belief) that if you >> want the DIE effect at only one rpm, then given all else is equal >> (which it seldom is) then it may make sense to port an engine to >> give the same timing on both primary and secondary. I think this >> would be hard (and not necessarily good) to do on the 6 port as >> there is a wide difference between say the secondary and aux >> timing. I think it is easier to get the two ports on a turbo >> block equal in timing without major challenges. >> >> I will be merging my primary and secondary runners shortly after >> they exit the engine block on my next manifold. My ports are >> already equal in timing. So hopefully with in the next month or >> two, I will have this new intake fabricated and can provide some >> data on the results. >> >> Hope this addresses your question. >> >> Best Regard >> >> Ed Anderson >> >> >> >> > --------------090404050407020206090707 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit Ed, here's a highly theoretical question (as I have no plans to take apart my engine again):
will street porting the 1986 NA narrow the intake runner length curves on the graph?

On another note, I somehow have the idea that it's a bad idea to combine the runners. For example Jim Mosur had big problems splitting the water flow between his two radiators when he ran them in parallel. Tracy has argued that it doesn't matter because on an intake system you have a vacumn sucking in the air which would split it evenly. However, not so with the DIE pulses. I could even imagine that the pulse, preferring on path (one port) could even start to push out the air/fuel charge out the other port.

Over to you...

Finn

Ed Anderson wrote:

I believe (but have no data to support the belief) that if you want the DIE effect at only one rpm, then given all else is equal (which it seldom is) then it may make sense to port an engine to give the same timing on both primary and secondary. I think this would be hard (and not necessarily good) to do on the 6 port as there is a wide difference between say the secondary and aux timing. I think it is easier to get the two ports on a turbo block equal in timing without major challenges.

I will be merging my primary and secondary runners shortly after they exit the engine block on my next manifold. My ports are already equal in timing. So hopefully with in the next month or two, I will have this new intake fabricated and can provide some data on the results.

Hope this addresses your question.

Best Regard

Ed Anderson

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