big inch SBC EFI intake mainfold

[Bruce Plecan]

Hmmm, well, just something that always gets me thinking

Duty cycle WOT usually 85+%,  intake valve open, what 28% of the time.
So most of the time the injector is shooting at a closed valve anyway.
Most of the atomization takes place at the injector (OK, what 98%), and the
rest is vaporization, till the valve opens, and then some more atomization
would take place again as the valve opens.  So as long as the injector is
pointing at the general area does it really matter?.
It looks like to me that the new tall narrow intakes, get the injector up
high so as to spray on the hot back side if the intake valve.  Since the
fuel is going to puddle there anyway
Grumpy


> 15* angle measured from the pintle to the face of the intake valve.
> (backside) I prefer to follow the angle above due to the fact that the
> portion of the spray pattern is at it's largest point there for better
fuel
> atomization. Also, the air velocity increases slightly at the bowl area of
> the valve pocket, furthermore enhancing fuel atomization. I have seen many
> other ways to do it also, but I believe the the ^ is the most efficient
way
> to deliver the incoming fuel in terms of power and keeping the BSFC down.
> Less fuel dropout means more energy released during a combustion
event/gram
> of fuel used.
>
> Regards....
>
> Phil Rickard- Engine builder/Tuner for Les Stanford-Pirate Racing Corvette
> C5R......Formerly with L.P.E.
> ----- Original Message -----
> From: <WEG1192 at aol.com>
> To: <gmecm at diy-efi.org>
> Sent: Tuesday, August 08, 2000 6:34 PM
> Subject: Re: big inch SBC EFI intake mainfold
>
>
> > Anyone know if the angle that an injector shoots into a ported manifold
> makes
> > much difference? GM TPI is angled out toward the heads. Other systems
seem
> to
> > be angled straight down. What's best?
>
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