The real basics

[David & Cheryl Haggard]

   Yeah, gotta agree. But for some reason, I've seen that carbs are great on
dual-planes, but TBI can suck on dual-planes unless the injectors are
flow-matched. My experience. Yours may vary.
   So I use single-plane manifolds for TBI.

Dave Haggard


> -----Original Message-----
> From: owner-gmecm at diy-efi.org
> [mailto:owner-gmecm at diy-efi.org]On Behalf
> Of Bruce
> Sent: Thursday, May 31, 2001 2:17 PM
> To: gmecm at diy-efi.org
> Subject: Re: The real basics
>
>
>
> If you stack up the tolerances in a carb., it doubt you'll be anywhere
> within 3%.  Toss in cylinder variancnes, and it's out the
> window.  the EFI
> ignores any pulsation differences for cylinder to cylinder
> diferences, so
> I'd indorse the EFI is better then the carb in all situations
> for balance.
> Bruce
>
>
>
> From: "David & Cheryl Haggard" <david at newcovenant.com>
> >    In my mind, the problem with a dual-plane manifold with
> TBI is mixture
> > balance. The two injectors MUST be matched in flow to
> withing 1%, or half
> > the cylinders will run richer than the other half. With a carb, the
> mixture
> > is very well balanced. Not so with TBI.
> > Dave Haggard
>
> > > Of Eric Deslauriers
> > > Subject: Re: The real basics
> > > Bruce,
> > > What, in your esteemed estimation would be one (or several)
> > > "well thought out
> > > manifolds" for TBI?
> > > What are the downsides to something like a dual plane
> > > Performer? I've had good
> > > perf with them on carb'd SBs, but TBI is it's own thing. :-)
> > > TIA!! (and thanks for the note, it's going into my binder
> > > with the other stuff!)
> > > Eric D
> > > 88 K30 Blazer
> > > > <snip>
> > > > TBI, you want to use a well thought out manifold. Single
> > > plane is best.
> > > > You need to run some controlled amount of manifold heat,
> > > for High RPM
> > > > useage, since you lose the atomization advantage there. No
> > > real need in
> > > > trying to run a TBI off of a TPI ecm, BTDT. You want the
> > > faster pulsing
> > > > rates to help with the atomization.
> > >
> > > <snip>
>
>
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