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 Correct Injector Size Calculator

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Sir Charles
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Number of posts : 57
Registration date : 2009-02-27
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Location : Nellis AFB, NV

PostSubject: Correct Injector Size Calculator   Fri Feb 27, 2009 4:18 pm

Correct Injector Size Calculator

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Brake Specific Fuel Consumption (BSFC)

BSFC = LBS of fuel per hour / horsepower

(generalized as: 0.45=lean, 0.50=normally asperated,0.55=supercharged/nitrous oxide)



To figure injector size:

HP = horsepower

NC = number of cylinders

Injector Size = (HPxBSFC)/NC

example:

300x0.50/8 = 18.75 or 19lb injectors

Duty Cycle = (DC)

DC = Safe Injector Duty Cycle

(Injectors are rated at 100% flow compacity, expressed 100% of their Duty Cycle. We need to adjust the number for the percentage of time the injector must be shut down between pulses to avoid damage. Running an injector at a flow rate of more than 85% of its Duty Cycle will damage the injector, in practice the injector should not be run at greater it's Duty Cycle in continuous mode.)

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To Figure The Maximum HP an Injector Can Sustain:

Max HP = (NC x injector size x DC)/ BSFC

example:

8 x 19 x 80%(or 0.80) / 0.50 = 243.3HP
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