Quote:
Originally Posted by Pierce Jones
Looking at a data log, my injectors (24 lbs/hr) are open 7.7msec (88% duty cycle) at 7000RPM (42 deg/msec). The intake has 308 deg dur @ .020”. So injectors are open 323 degrees of rotation and in my case spraying at a closed intake valve.
Not sure if any would be gained by a 36 lbs/hr etc.
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One crank rotation @ 7000 RPM is ► 1 / (7000 / 60) = 0.008571 of a second
My understanding of Duty Cycle is it is the percent of open time against 2 crank rotations (720 degrees).
1) @ 7000 RPM @ 7.7 Mill seconds pulse width I get 44.9% Duty Cycle
2) @ 7000 RPM @ 88% Duty Cycle I get 15.0857 Mill seconds pulse width
I don't know what your engine BSFC or HP is. But a 24lb injector running at its rated PSI, if I guess .45 BSFC and 375 HP, that would 2# above.
Stan