[Diy_efi] Fuel rail sizing

[Phil Lamovie]

Dave Dahlgren wrote

> The average flow is down with sequential as you would only have
>  at most 5 of the six injectors firing

At 90 % duty cycle you have all 6 open for at least 142 degrees.
(360 - 218 degrees)

> The average flow is down with sequential
> So sorry to say you can run a smaller fuel rail with sequential
> injection, it is less demanding on the entire fuel delivery system.

Flow is not changed very much by opening or closing the injector
the by-pass nature of the system has most of the fuel just passing
through.

Your concern for "instantaneous flows" is not well founded.

Injectors don't just open.  They start at zero flow and do have
partial flows at partial openings.  The electrical configuration
plays a part as well as the fuel pump and lines and dampers.

Repeatability is of much greater concern for system designers.

HHIWTPC

Phil


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