V8 S/charged motor jet size?
OK so planning a HFS-6 system for this motor.
8 injectors rated at 39lb/h (~409cc/min) at 3 bar, but fuel line pressure runs at ~ 70PSI -80 (so ~5bar), so flow perhaps well above 500cc I would expect, but difficult to know exactly - anyone know how to extrapolate this? So if I am running (lets assume 500ccx8=>) 4 litres / min and running water only I should target an injector of 10% fuel flow giving me 400cc flow rate required. Boost is at 29PSI (incl atmospheric), so net +ve boost of ~15psi (~1bar). 160psi less the call it ~30psi gives me 130psi net line pressure to feed 400cc flow so I need effectively one 0.8mm jet? Am I on track or way off base? |
Re: V8 S/charged motor jet size?
Raising the FP from 3 bar to 5 bar should raise the rate from 409cc to 531cc. So 4228cc x 10% = 425cc Using the HFS-6 considering pumping losses and such, this is probably a .8mm or .9mm jet.
In you calc you only subtract the head pressure in the manifold, so 15psi, in reality it's not much difference. |
Re: V8 S/charged motor jet size?
Many Thanks !!! And would you recommend two jets of 0.5 or just one of 0.8/0.9 ?
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Re: V8 S/charged motor jet size?
It depends on the piping and how you can fit the jets in the manifold. One bigger jet is less likely to clog.
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