[Land-speed] Racing fuel injector

[Dave Dahlgren]

For argument sake lets pick a 500 inch engine and if you want to fill me in 
better with what you are running it helps..
a 2000 rpm idle with sequential system has an available time of 60 ms. 
1.5/60=0.025 or a 2.5% duty cycle where the opening can be counted to repeat 
with some success according to the ad.. this equals 60 lbs/hr or 120 hp on 
gas or about 50 to 60 hp on alky..unless you are running nitro you will be 
very very rich.. an average friction load on a BBC is 12 to 16 hp or 6 to 8 
lbs/hr.. with some luck you can hope for a slow but reliable opening time 
for this injector and suspect the case as it only needs 4 amps and for this 
flow rating it has to be there is just too much area in the nozzle to flow 
that much and not require more than the force 4 amps offer. So if the gods 
of EFI are smiling the opening time is 1 ms. painfully slow... now you have 
0.5/60=0.008333 or .8333 duty cycle or a tiny bit less than 20 lbs/hr 
probably workable but will fail the linearity test that is claimed unless 
the flow rate somehow catches up at the very end of the duty cycle range... 
again non linear.. I would not believe any claims without extensive flow 
testing by someone independent.. Lesson over..LOL..
Dave
Oh and EFI guru might be a dangerous word as well on what with what.. 
personally I will consider myself a practitioner workin on some of the 
fastest cars and bikes in the world rather than a 'guru'..LOL...
----- Original Message ----- 
From: "Rick Yacoucci" <Rick at Turborick.com>
To: "'Dave Dahlgren'" <ddahlgren at snet.net>; "'LAND SPEED LIST'" 
<land-speed at autox.team.net>
Sent: Friday, January 09, 2009 7:47 PM
Subject: RE: [Land-speed] Racing fuel injector


>I was thinking 300 lb/hr for my setup
>
> "The injectors operate linearly with pulse width as small as 1.5
> milliseconds"
>
> The way I understand this is that they will pulse under 1.5ms but not
> linearly....
> Am I wrong in that assumption ?
>
> Rick