chances are you guys probably already know these by heart, but this is my (weak) attempt to make a useful contribution...
Piston speed = stroke x 2 x RPM / 12
Port velocity = (bore^2/port_dia^2) x mean piston speed
CFM = 3456 / (C.I.D x RPM [max]) **this formula assumes 100% VE**
CFM = ( cid X .5 X Ve X rpm ) / 1728 (use 1.0 for 2 stroke engines)
Cubic inches =Cubic Centimeters/16.387
Injector sizing (in cc's) = (HP x BSFC x 10.5) / (# of injectors x Duty cycle)
Injector sizing (lb/hr) = (HP x BSFC) / (# of injectors x Duty cycle)
Max inj. HP (lb/hr) = (flow rate x # of inejctors x .8) / BSFC
Max inj. HP (CCs) = (flow rate x # of injectors x .8) / (BSFC x 10.5)
Flow rate(modified) = (sq.rt of new rail pressure/old rail pressure) x old flow rate
BSFC = lb/hr of fuel / BHP
Fuel requirement = Horsepower x BSFC
Lbs/hr = HP x .5
GPH = Lbs/hr / 6
Pressure = V^2 / 57,600 (bernoulli's principle. v=velocity)
for turbo
Pressure ratio =Pb+Pa/Pa (pa= atmospheric (14.7), pb= boost)
PR=(14.7 + psi ) / 14.7
CFM = [(DxCIDxMAX RPM)/1728]xVExDR
CFM = L x RPM x VE x PR / 5660
Boosted CFM = PR x CFM
Turbine trim = [ (inducer^2) / (exducer^2) ] x 100
thats all for now. if i think of more, i'll put em up.
Good info. Thanks for posting.
In the injector sizing formula, is that supposed to be BFSC, not BMFC?
Don
that is something i will look into right now to confirm, as i honestly don't know that answer myself.
thanks for pointing it out though.
yes. you're absolutely correct. thank you for the keen eye.
correction in progress!
What does what when???.Can understand the formula's , But ya gotta speak English bro!