V-8 Int. man. design

[Paul (BRAAP) Ruschman]

Gary Derian wrote:
> 
> ----------
> > From: Paul (BRAAP) Ruschman <prusch at ix.netcom.com>
> > To: diy_efi at coulomb.eng.ohio-state.edu
> > Subject: V-8 Int. man. design
> > Date: Tuesday, 27 May, 1997 1:44 AM
> >
> > I am new to the list and am currently designing my own EFi Intake
> > manifold for my Chev 350 powered Datsun Z car. I plan on using the
> > L-jetronic.
> >       My question.
> >       My plan is to make a manifold that utilizes two plenums, one per bank of cylinders. Knowing that the V-8 fires as if it were 4 V-twins
stacked instead of two banks of four cylinder engines does this effect
the intake air flow to the individual cylinders? Do I need to design the
intake like a dual plane 180 degree carb manifold that plenums the two
outer cylinders of one bank with the inner two cylinders of the other
bank?
> >       I feel that this being injected that it shouldn't make much
> > difference fuel wise, but would one cylinder rob the available air the next cylinder is supposed to recieve?
> >
> >               Thank You,
> >       Paul (BRAAP) Ruschman
> >       
> 
> Uneven pulsation will affect the intake flow and the averaging that the air flow sensor sees.  Use two plenums but not for one bank only.  
Instead, connect cylinders 1, 4, 6 and 7 to one plenum and 8, 3, 5, and 2 
to the other.  This will make each intake stroke at 180 degree intervals 
and provide balanced flow.  For best performance, the exhaust should also 
be connected this way but the gains are small.
> Gary Derian <gderian at cybergate.net>



	What about doing as I proposed originally with two seperate 
plenums, one per BANK of cylinders, and adding a balance tube lets say at 
the rear of the plenums or in the middle or at say the runners for 
cylinders 7 and 8?

		Paul (BRAAP) Ruschman
		http://www.datsuns.com/paul.htm
	        http://www.datsuns.com