[DeTomaso] Experts on the List Re: Any negative (other than price) in bigger injectors?

[Mad Dog Antenucci]

Julian says,
[The little I know I have gleaned from books and the internet, so in
reality its probably just enough to be dangerous! There are others on
the board who are much more knowledgeable than I.]
------------------------------------------------

Mad Dawg replies:

On the Board?

There is?  Really?

Who are they? ;-)>

P.S. Everything I learned I learned  about fuel injection I learned from those so called fuel injection experts who ain't on the List (Mike Trusty & Richard Clewett).   

 
Mad Dawg Antenucci 
Team Pantera Racing 
The 1st & still the only vintage race team in open road racing 
www.teampanteraracing.com




________________________________
From: Julian Kift <julian_kift at hotmail.com>
To: kenn_green at yahoo.com; De Tomaso List <detomaso at realbig.com>
Sent: Sat, November 7, 2009 10:23:37 PM
Subject: Re: [DeTomaso] Any negative (other than price) in bigger injectors?


Ken,



I'm a little confused with the units you quote, injectors are normally sized in lbs/hr or cc/min. A 36 lb/hr injector in a normally aspirated V8 will support ~460HP at a nominal fuel pressure of 3 BAR (43.5 psi). 



A 65 lb/hr injector supports around 850HP and is a huge step up from where you were and IMO way oversized.






Julian



Date: Sat, 7 Nov 2009 15:15:43 -0800
From: kenn_green at yahoo.com
Subject: RE: [DeTomaso] Any negative (other than price) in bigger injectors?
To: detomaso at realbig.com; julian_kift at hotmail.com






Julian,

   But how large is too large for a decent idle and fuel economy?  I'm looking at a just enough 36 GPH but spotted some 65 low impedance injectors for about the same price.  I don't doubt 160s would be a problem, but would 65s?

Ken




From: Julian Kift <julian_kift at hotmail.com>
Subject: RE: [DeTomaso] Any negative (other than price) in bigger injectors?
To: kenn_green at yahoo.com, "De Tomaso List" <detomaso at realbig.com>
Date: Saturday, November 7, 2009, 3:10 PM




Generally injectors are sized o an 80% duty cycle. If they are too large, then at idle and cruise conditions, it will be more difficult for them to have identical fuel delivery for each identical pulse width. Tuning wise fuel economy will likely suffer as well.

Julian

> Date: Sat, 7 Nov 2009 10:59:04 -0800
> From: kenn_green at yahoo.com
> To: detomaso at realbig.com
> Subject: [DeTomaso] Any negative (other than price) in bigger injectors?
> 
> I'm shopping injectors and need to pick the flow rate.  Does anyone know if there is a down side to bigger injectors or using low impedance injectors if the ECU can drive them?
>  
> It seems like a bigger injector with a shorter on time (duty cycle), and a low impedance injector that turns on quicker, would take greater advantage of a timed sequential system?
>  
> I looked at a lot of injector intakes, and the LS-9 points the injectors at the opposite wall, not towards the intake valve.  I think other LS motors point more towards the valve.
>  
> Regarding injector placement along the intake runner, seems like closer to the head makes it less likely that reversion would push fuel into the plenum and would therefore better tolerate cam overlap?  But closer to the plenum might otherwise be better?
>  
> You can ask 10 "experts" and you get 10 different answers.  
>  
> Ken
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