carb vs. efi

[Robert Harris]

Seems to me, everyone is complicating shitting and trying
to act mighty proud of it. 

What works best is a 100% vaporized, homogenous mixture as it enters the
combustion chamber.  What gets it there depends on too many depends to
generalize.

Take the lowly propane/CNG mixer for example.  Does this off the shelf -
specially with an oxygen feed back
loop -- but the fact that the fuel is a vapor at any temp
above -44 does help a lot.

Timed Port Injection gives a mixture almost as good as a
well tuned independent runner Weber or Delorto Carb, but
offers the advantage of pret near self tuning and optimizing
whereas with the carbs you need the patience of a saint 
and the luck of the Irish to even come close to being right.

Continuos Injection Systems properly set up are very simple to work on and work
very good but aren't "KooL" 

Given high enuff air flow velocity and the right fuel, pissing
in the manifold works - witness AA fuel.

What makes any of these methods work BETTER is a small computer that either
closes the loop or makes tuning and tweaking the open loop doable or both. Try 
looking at the strengths of everything and adapting it.
 
Example.  TPI EFI is fine at low air flows and RPM, but
gets complicated fast as RPM rises.  The air flow sensor
is biased toward more accurate low mid and biggerizing
the injector takes away from low end controllability.  Port
injection gives fine control and throttle body gives much
denser charges because the fuel cools the charge at the
throttle mouth and more air flow. MAF tends to work better
at low flows and MAP sux low but works fine High (according to posts on this
list)

Why not optimize a TPI for low mid throttle and load - use
its advantages to the limit - using SMALL nozzles to be
really right on.  Then when the RPM and air flow is high
enuff, CIS some fuel right at the end of the runners.  Since the flow is fast
and furious and highly turbulent, it all gets
well mixed and you pick up the bennie of evaporative cooling with a simple
system.  Don't need complication when you have the RPM.  With synergy like
this, you
steal the best of both ideas.  

Just my usual obnoxious 2 bucks worth of bull.

"When some one gets something for nothing -
             some one else gets nothing for something "

If the first ingredient ain't Habanero, then the rest don't matter.
Robert Harris <bob at bobthecomputerguy.com>