big inch SBC EFI intake mainfold

[Scott Knight]

Actually one that sticks out like a sore thumb is the fact that synching
up an SEFI controller does nothing for the engine except at very low
rpms...and then most of the gains are not in driveability, but
emissions.  His feeling is that even at low rpms that the 'puddle' of
fuel on the intake valve would never really puddle since the valve is so
hot and at low rpms, there is not enough fuel there to matter anyway.

Then the conversation turned to SEFI vs batch and the SEFI advantages. 
According to him, there is no horsepower advantage at all to a SEFI
system (which I have also heard from other people).  The advantages are
all in starting and low speed engine operations (emissions, economy,
etc).

Later dates.

> Sometimes, it's a matter of packaging that leads to compromise.
> The greater distance gets to the atomization, evaporization, issues all over
> again (which it is IMHO).
> Any other comments of his ya remember?.
> Grumpy
> 
> > Not that I have an expert opinion here, but a long time ago, John Meaney
> > told me that the best location was as high in the runner as you can get
> > (without spraying into the plenum) and mounting the injector normal to
> > the runner.  Of course he was talking about racing engines, but that was
> > his opinion about 8 years ago...not sure if it has changed since.
-- 
Scott Knight  mailto:scott at scottknight.com
http://www.scottknight.com/ IRC:SS396man
'00 White Grand Prix GTP
'95 Black Impala SS
'94 Ducati 900SS CR
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