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

[John Taphorn]

Mad Dawg

Your flippant remarks insult the likes of Kirby and others whose base 
mapping have helped many owners out of a pickle.

Get back on the porch!

JT
----- Original Message ----- 
From: "Mad Dog Antenucci" <teampantera at yahoo.com>
To: "Julian Kift" <julian_kift at hotmail.com>; <kenn_green at yahoo.com>; "De 
Tomaso List" <detomaso at realbig.com>
Sent: Sunday, November 08, 2009 12:28 PM
Subject: [DeTomaso] Experts on the List Re: Any negative (other than 
price)in bigger injectors?


> 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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