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Re: large runner 1500 (single ZS) manifold needed (longish)

To: "'Friends of Triumph '" <FOT@Autox.Team.Net>
Subject: Re: large runner 1500 (single ZS) manifold needed (longish)
From: Larry Young <>
Date: Tue, 07 Dec 2004 08:27:07 -0600
Without getting into a technical discussion about Reynolds number, etc., 
to achieve laminar flow would require a drammatic reduction in the flow 
velocity and/or the diameter of the port..
Larry Young wrote:

>In a message dated 12/6/2004 7:51:22 AM Pacific Standard Time, 
>But isn't the whole idea to develop laminar flow, not turbulent?  At the
>point where it changes, there should be a fairly big discontinuity in flow
>rate, no?
>Avoiding turbulence is the whole reason we try to keep passages straight,
>smooth changes in cross-section, etc.
>Its been along time since I open a chemical engineering book. However, I seem 
>to recall that the fundamental reason for keeping piping straight and rounded 
>was to minimize the resistance to any type of flow. I can understand that 
>would be very important to the passages leading to the combustion chamber be 
>straight and smooth. But I would think that we would want some substantial 
>(turbulence) created as the fluid/gases entry in into the combustion chamber 
>itself. Thereafter we would want to remove the gases as easily as possible, 
>meaning as straight and smooth as possible. Seems I am missing something. 

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