Using TBI on moded 5.7

[CSH-HQ]

Just hate it when I can't pick a post apart <g>.. Good info., and seems
to line up with what I've found.
  
  If you want to get a rough eye-ball on the spray pattern/quality, just
use a timing light off of 1-6 ona SBC.  Will give good clearty about where 
the cone ends, and if the injector is dripping heavily when it should be 
spraying (really large gobbules).

  Also, if you machine for bigger butterflies, you'll need to do the above 
to set the spacing for the injectors.  When you install the larger 
butterflies the "cone" winds up totally on the buterfly instead of at the 
"air gap" where the butterfly is closest to the throttle bore.  Going from 
1.8s to 2.0 took raising the injectors about 1/8" inch...
Grumpy
    Was getting to want to almost bypass the Smokey Ram, and go TPI, but this
SR, 730, and high pressure injectors is starting to sound really 
good/different...
    Might have to get the 200R4 finished, change gears, and tighter 
converter now!!
    Hey Doc, where's the Predisone?.



>Mike,
>I cant guess what you may find wrong, but I
>wouldn't worry any more about "fuel puddling".
>All of my family fleet of TBI's (one Astro, 2 PU's)
>puddle as they should.
>
>One of the early 80's SAE papers on TBI 
>0098-2571/80/8810/0102 SAE, Inc
>included a paragraph on "fuel pulse smoothing" 
>and it had the following things to say about 
>this area.
>
>Re-phrased snips from paper:
>
>1)  Placement of injectors above the throttle
>bores/throttle blades is proper to smooth 
>injector pulses over time.
>
>2)  The throttle bore walls and throttle blades 
>will accumulate fuel in a sheet that will flow 
>toward the openings around the circumference of
>the throttle blades. 
>
>3)  At idle and part throttle (MAP less than 
>60 kPa) a sonic pressure ratio will exist across 
>the blades and this will violently shear off 
>the fuel sheet at the openings around the 
>circumference of the throttle blades.
>
>4)  This violent mixing of fuel and air promotes
>good part throttle distribution and is considered
>as a "design feature" of TBI.
>
>Where TBI struggles is when the manifold is 
>re-pressurized rapidly (rapid change in throttle
> opening) and a fuel film can/will condense 
>on the manifold walls - Part of the reason that
>extra fuel (acceleration enrichment) is required 
>and why so much of the TBI passages are heated by
>hot water.
>
>Bud
>        
>----------
>>From: Mike Vannorsdel <vannorsdel at rmi.net>
>>To: gmecm at efi332.eng.ohio-state.edu
>>Subject: Re: Using TBI on moded 5.7
>>Date: Mon, Nov 8, 1999, 7:01 PM
>>
>
>> I can actually see puddling on the throttle plates at idle. 
>