[Diy_efi] Fuel rail sizing

[Dave Dahlgren]

I was alluding to the instantaneous flow at the injector opening being different
on the different injectors due to the pressure difference. When you open them
all at once the pressure difference between injectors is not the same as opening
them up one at a time in sequential. If you have a delta in pressure you have to
have a delta in flow. If you only open one injector the delta in pressure is
less than if you open them all at once. You have two different types of demand,
average and instantaneous you have to size the rail for the larger of the two.
The average flow is down with sequential as you would only have at most 5 of the
six injectors firing and the peak would be down as well because you are only
turning on or off one injector at a time. So sorry to say you can run a smaller
fuel rail with sequential injection, it is less demanding on the entire fuel
delivery system.
Dave Dahlgren

Phil Lamovie wrote:
> 
> Dave asked "What piece of physics would you base that on?"
> 
> I'm not suggesting that the pressure is in any way shape or form
> the same at the inlet point of each injector.
> 
> I am stating that fuel rails for sequential have to be the same size
> and deal with the same flows as batch because at 90 % duty cycle
> at least five of the six injectors are open at any given time.
> 
> I believe the Subject line reads "Fuel rail sizing"
> 
> I could be wrong.
> 
> Phil
> 
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