Originally Posted by
Marc sierra
Thanks for explaining it. But what I don't understand is why the 400 bhp engine already needs 168 liter/hr.
My example of 350 bhp would require 350 x 0.6 = 210 lbs-hr, which is 33 gallon/hr, which is equal to 150 liter/hr.
But with 4x 803 injectors 350 bhp is possible I believe. And 4x 381cc/min is 1.52 liter/minute, so that would be 91 liter/hr.
The difference is quite big, so something doesn't add up. Do the 803 injectors actually flow more (due to a higher pressure?)? Or is the BSFC lower in that situation?
But in principle it is the difference between the pump fuel and the special fuel you are using. I understand the difficulty in getting that amount of fuel at that pressure. But are you seriously going to run at about 4 bar boost?
Yes your injectors will flow more at higher pressure. Yes we are going to run circa 4 bar. I was going to start a new thread as to why Ive arrived at that figure 3.94 bar to obtain the 656ft-lb of torque @ 8k which will give 1000bhp. Its a theory because the bhp per .1bar of boost is something you can calculate but we know its between 10/12bhp on engines dynoed so I have used 11bhp in my calcs.
We need this boost because we are not making the ports larger or cams wilder just using the air-pump we strap to the engine to increase Torque.
Horsepower = Torque x 2 pi x rpm / 33000 which simplifies to:
Horsepower = Torque x rpm / 5252.
Hence Torque = Horsepower X 5252 / 8000 = 656 ft-lb.
QED.