injection nozzle design

why is it that almost every diesel engine old enough to be mechanical injection uses nozzles with a leakoff manifold/lines but the d282 has none?
i always thought it strange to have leakoff- after all, isn't the injection pump supposed to meter the fuel, so i'd think it should all get burnt.

on a similar topic, what would happen if you shimmed the nozzle on say an 806 to crack at 3000 or 4000 psi instead of the 2000 and change it says in the book? should be better atomization, easier starting, cleaner burning, right? or can't the pump make that much pressure?
 
mazemeister That rosa master pump will not stand that pressure. I know I DIDNOT SPELL THAT RIGHT!!
 
IH D282 do not need return lines as the nozzle valves are outward opening, not inward like the 361/407 injectors. Higher opening pressures do help with atomization, but is harder on pumps also unless designed for increased pressure load. There are many newer engines with 3500 to 4500 PSI opening pressure, and some still use Stanadyne and other rotary pumps just fine.
 
Some injectors are intentionally designed to pass a small flow of diesel fuel through them to keep them lubricated. So are just about all mechanical fuel injection pumps.
 
The Stanadyne/Roosamaster D series rotary-distributor pump is rated for a maximum pressure of 10,000 PSI.
 

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