intake plenum size?

[Larry Heath]

Yes larger than engine size plenums work well on larger engines, I don't
know how this would work on smaller short stroke engines. I run an injected
565" alcohol engine that uses a plenum of aprox 1120 cuin which is obviously
just about 2x engine size. It runs very hard on the top end, about 5 or 6
mph faster than what a car with a typical manifold would at the same ET.
This is with runner lengths and areas sized for optimum torque production at
much less that max hp rpm. I am of the opinion that the larger the plenum
size, to a point, the better the pulse/resonant tuning is, i.e. the large
plenum allows a bunch better reflection of the pulses and at the same time
keeps crosstalk from cylinder to cylinder lower.

It seems to work for me, anyway.

Later Larry

----- Original Message -----
From: "Bruce" <nacelp at bright.net>
To: <diy_efi at diy-efi.org>
Sent: Monday, July 02, 2001 9:40 PM
Subject: Re: intake plenum size?


>
>   More then one cylinder, and not Individual Runners, you'll have a
plenum.
> Carb'd engines can have a plenum.
>   Hi performance engines about follow that, thou some folks are having
luck
> with plenums much larger then that.
> Bruce
>
> From: "Ian Weaver" <ijweaver at adam.com.au>
> Subject: Re: intake plenum size?
> > The volume of a plenum chamber is normally the same as engine volume
> > ie: 3lt engine = 3lt chamber.
> > Plenum chambers are normally associatedwith injected engines.
> > Ian
>
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