In a nutshell, multiple throttle bodies improve low end output by
preventing individual cylinders from stealing some of each other's
intake mixture as happens in a common-plenum manifold. Same concept
as single vs. dual plane manifolds on a V8. They may also offer
higher total flow capacity compared to a practical (airflow-limited)
plenum design. A good discussion is in David Vizard's "How to Build
Horsepower Vol. 2: Carburetors & Intake Manifolds." (Also nice
pictures of his Chevy pickup with quadruple downdraft Webers!!!)
Cheers,
Craig Blome
---Mark Todd <marktodd@internet8.net> wrote:
>
> Hey y'all,
>
> Can anyone enlighten me as to theoretical and/or real-world
> benefits of using multiple runners and throttle bodies instead
> of the usual single body and tank for a fuel-injected system?
>
> Obviously, the world's best engines are set up this way, but
> what's it worth? And what do the world's best turbo motors
> use?
>
> Are there any books with something to say about this?
>
> Thanks (reeling from this winter's 3rd day of near-freezing
temperatures)
>
> Mark Todd
> # 323 CSP Solo2
> Delta Region SCCA
>
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