Injector sizing

Wayne Macdonald wmcdonal at hutch.com.au
Sun Feb 25 22:12:23 GMT 2001


The motor with 350 ft/lbs must produce it below 3600 RPM and the torque
must fall off very quickly.

> Subject: Injector sizing
> 
> Hello all,
> 
>     I have a question about injector sizing.  Does anyone know of a torque
> based injector sizing formula ? All of the formulas I've seen use horsepower
> to determine injector size.  I am looking at a supercharged application and
> am a little puzzled about the torque output.  If maximum VE occurs at the
> torque peak, won't the highest fuel requirement be at peak torque?  I realize
> fuel consumption will be highest over time at higher rpm, but I'm interested
> in maximum pulsewidth.  For example, I have a 3.8 liter engine with 270cc
> injectors that has around 240 hp and 230 ft/lbs of torque.  I am looking at
> another 3.8 liter engine that is supercharged with 350 ft/lbs of torque and
> less horsepower ! (how do they do that ?)  Obviously it takes more fuel to
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