Join Date: Sep 2007
Location: Calgary Alberta Canada
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I read a magazine today and it was saying how to choose the right injectors based on your application.
For reliable operation of injectors, the maximum duty cycle is 80 percent!
Whether you use it as an interesting fact or the deciding factor in choosing your injectors.
All you need to know is the BSFC (Brake Specific Fuel Consumption) and Lbs/HR
BSFC represents the amount of gas that is used per hour for each horsepower made (apparently its retarded hard to figure out)
We assume that the BSFC is .50 on N/A Engines and .80 on Power added applications
(We assume that because they have been the most consistent numbers seen in testing.)
So if we want to figure out the maximum horsepower that a given size injector will support,
Were going to use the following calculation:
Example. ?-LBs/HR x .80 (Duty Cycle in percent) x 8 (Number of Cylinders) / (Divide) .50 (BSFC)
Example. Lets say your 5.0 Liter has some pinner injectors
19LBs/HR x .80 x 8 / .50 = 243.2HP - This is the maximum FLYWHEEL PONIES your injectors will handle
I hope its useful or I have taught someone something new!! haha
Remember - Using this calculation doesn't mean your injectors will handle that much power
Pushing the maximum amount of power through your injectors will cause power loss and inefficient delivery
Remember to upgrade other fuel components along the way
1989 Mustang LX Hatch
2.3L - Custom CAI, Flow40 w/custom exit, V8 is coming after appearance mods.