On Tue, 06 Jan 2004 12:37:27 +0000, Austin Shackles
wrote:

On or around Mon, 05 Jan 2004 23:35:36 GMT, (QrizB)
enlightened us thusly:


... and 300 bar isn't an unreasonable pressure for an injection
system. Many modern diesels run at roughly ten times this pressure.

you sure? the figure quoted for the later TDi Land Rover engine is 300 bar.

3000 bar is a lot.

GDI goes up to about 1000psi (50bar/750psi typical) and they don't
mess around with large excess flows to allow cooling. Pump is sized
so one pump stroke delivers just enough fuel for one injection at max
power at max power rpm. They are usually driven off the camshaft but
some new ones are electric.

One problem is lubrication. Propane and Petrol will seize a high
pressure pump in no time (put petrol in a diesel tank and you can get
away with a mile across town to have the tank pumped out but won't get
a very far down a motorway). Diesel has good lube properties and some
additives.

--
Peter Hill
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