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Subject: Re: TWL: Temporary Injector Pipes
Albin43Tr@XXX.XXX
Date: Fri Mar 23 2001 - 12:46:15 EST
Hi All,
<< Wait a second.
Each delivery tube between the injector pump and the injector nozzle has to
be exactly the same length or you will change the timing of the fuel
delivery. A shorter tube would cause pre-ignition, a longer one would
deliver the fuel too late for complete combustion. That's why the injector
piping always looks like a lot of spaghetti.
>>
Just thinking out loud here ....
Diesel fuel in incompressible, just like hydraulic oil and water, according
to my old physics instructors. (But ya gotta watch them, they probably lied a
lot.) Therefore, theoretically, if no air is in the line and the pipe cannot
expand, the instant the injector pump injects fuel at one end of a pipe,
irrespective of its length, the same amount of fuel has to come out the other
end of that pipe at the same time and rate. If this is true, then the length
of the pipe has no affect on fuel delivery timing. It follows, then, that the
bore of the pipe has to be sufficiently large (low/no restriction) to allow
the pump to inject the correct amount of fuel into the pipe during the
correct time period. As old aviators said, what goes up must come down ... so
... what goes in must come out.
The critical criteria are, I would think, good end terminations, correct bore
(big enough to prevent restriction), and rigid walls.
The effect of a restriction in the pipe (too long, bore too small, kinks,
etc.) would be the same as raising the compression in an engine.... too much
and something is gonna give!
I am no authority on any of this ..... just pondering the question.
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