Fuel Injector Sizing Formula
03-08-2015, 12:01 PM
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Staging Lane
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Fuel Injector Sizing Formula Ran across this at www.rceng.com - seems useful for planning that new horsepower boost project we ALL seem to have "coming up as soon as the time/money is available"...
Fuel required rule of thumb:
.50 lbs/hr per horsepower produced for normally aspirated engines
.60 lbs/hr per horsepower produced for turbo/supercharged applications
Example:
So, for a normally aspirated engine take your horsepower projection, and multiply X .50
500 X 0.50 lbs/hr = 250 lbs/hr
So, for an 8 cylinder engine each injector needs to supply:
250 lbs/hr / 8 injectors = 31.25 lbs/hr
But wait - fuel injectors are only able to operate at about 80% duty cycle:
31.25 lbs/hr / .8 = 39.06 lbs/hr
So for a 500 horsepower normally aspirated LS1 type engine, you will need a 39 lbs/hr set of fuel injectors.
Hope this helps!
Regards,
Darden
Fuel required rule of thumb:
.50 lbs/hr per horsepower produced for normally aspirated engines
.60 lbs/hr per horsepower produced for turbo/supercharged applications
Example:
So, for a normally aspirated engine take your horsepower projection, and multiply X .50
500 X 0.50 lbs/hr = 250 lbs/hr
So, for an 8 cylinder engine each injector needs to supply:
250 lbs/hr / 8 injectors = 31.25 lbs/hr
But wait - fuel injectors are only able to operate at about 80% duty cycle:
31.25 lbs/hr / .8 = 39.06 lbs/hr
So for a 500 horsepower normally aspirated LS1 type engine, you will need a 39 lbs/hr set of fuel injectors.
Hope this helps!
Regards,
Darden
