how much flywheel bhp could 225 lph of fuel support roughly ?
14-12-2009, 10:29 PM
#1
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how much flywheel bhp could 225 lph of fuel support roughly ?
as above its a 276 lph pump but at full boost flow will be down to 225 lph. how do i calculate that to flywheel bhp ?
15-12-2009, 08:22 PM
#3
20K+ Super Poster.
To do roughly, for 4 cyl 1 injector per cyl.
276 litres per hour is 4.6 litres per minute
4.6/4 = 1.15 litres per injector per minute is available, which isn't a lot.
Now lets take a dark green "803" injector at 390 cc/min(3 bar) X 4 would be 1560cc, or 1.56 litres per minute would be needed at 80% duty cycle of the injector.
This should give a very good idea, to work out injector cc/min to bhp,
it is cc/min/5 x4, so eg 200cc/min would be 200 X 5 = 1000/4 = 250bhp, assuming 4 injectors on a 4cyl engine.
Of course there are always variables, but the above gets you in the ballpark so to speak, with fuel always err on the side of caution ie a bigger pump will do no harm, but a smaller one can(if too small).
tabetha
276 litres per hour is 4.6 litres per minute
4.6/4 = 1.15 litres per injector per minute is available, which isn't a lot.
Now lets take a dark green "803" injector at 390 cc/min(3 bar) X 4 would be 1560cc, or 1.56 litres per minute would be needed at 80% duty cycle of the injector.
This should give a very good idea, to work out injector cc/min to bhp,
it is cc/min/5 x4, so eg 200cc/min would be 200 X 5 = 1000/4 = 250bhp, assuming 4 injectors on a 4cyl engine.
Of course there are always variables, but the above gets you in the ballpark so to speak, with fuel always err on the side of caution ie a bigger pump will do no harm, but a smaller one can(if too small).
tabetha
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