[Diy_efi] Re: unequal inlet flows

[Steve Spiers]

Id say a better manifold is the answer. My 4 cylinder manifold has the
throttle body in the middle and 1 pair of runners each side. I say a pair
each side as they are really close together. Im not sure if this is ideal
but id be supprised if each runner had vastly different "coefficients of
restriction".

I doubt you could apply a theoretical equation to it, maybe an empirical one
after some testing.

Steve
----- Original Message -----
From: <fuelogic at ihug.com.au>
To: <diy_efi at diy-efi.org>
Sent: Wednesday, April 02, 2003 11:39 PM
Subject: [Diy_efi] Re: unequal inlet flows


> Hi all,
>
> I recall a bit of talk a few weeks back about gas momentum in plenum
chambers
> favoring the inlet ports furthest from the throttle. This makes sense to
me,
> along with the concept of different runners having different coefficients
of
> restriction (sorry..a while since I did fluid mechanics :))
>
> My question is, if u had a correction coefficient for each intake runner,
how
> would you weight it? I am assuming something like
>
> runner applied k = k * (airflow/max airflow) ^ some number.
>
> Anyone done any work around this? I figure it could be a very worthwhile
> approach if you have one cylinder running too rich at say 12:1 and another
> pinging at 13.5:1.
>
> Thanks...Matt
>
>
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