Holley 4.3 Manifolds

[Bruce Plecan]

On a wet system there is,
such thing as too much cfm.
fuel will easily fall out of suspenion with too low of velocity,  then you
have to run alot of manifold heat to get the engine to run on vaporized fuel
rather then atomized.

There is a whole word of difference from dry to wet, IMO.

I beleive it was GM High Tech Performance did a Buick turbo upgrade where
they went to a 72 from  stock and it slowed down.   Was a surpirse to
everyone specially on a turbo motor.
There is an optimim velocity for cylinder filling (no surprise, <g>).   As
an example, the 7 butterfly Buick Indy engines.

Now on a diesel, I'd agree 100% with the not too large of TB idea.
Bruce



> One thing to remember about efi, is that there is no such thing as
> too much cfm. With no signal to boosters required, heck you
> could use a flush tank for a throttle body & plenum. Or even
> a bell housing as someone was recently trying.
>
> BobR.
>
> Rich Vandervoort wrote:
>
> > Yesterday I noticed that Holley now offers a TBI intake manifold for the
GM
> > 4.3 v6.  I called Holley tech to discuss the suitability of modifying
this
> > intake for use on the 4.3 "vortec" heads.  I was told not to do this
because
> > this manifold like all other Holley products is optimized for its
intended
> > usage.  The bottom line was this manifold was designed for the tbi heads
> > with their small restrictive ports.  Therefore this manifold shouldn't
be
> > used with heads that flow significantly better than the tbi heads.  This
> > sounded like good advise to me.  After this discussion I noticed another
new
> > 4.3 intake manifold.  The 4.3 MPFI manifold (dual plane) is optimised
like
> > all other Holley products with a 1000 cfm throttle body.  From my
> > unelightened knothole this seems a bit large.
> >
> > Rich V.
> > _________________________________________________________________
>
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