The Hydraulic-Electric Unit Injector, or HEUI, which uses high pressure oil to increase injection pressure within the injector itself.
Then there's the Piezo injectors. They have only been around a short time, it's what the common-rail Cummins uses. It reacts fast enough that they open the injector up to 7 times per ignition event. That's how they got them so quiet, they pre-inject a little fuel, so there's already fire in the hole when the main shot of fuel hits.
The early Duramax is supposed to run 4500PSI+ in the fuel rails at idle. The more pressure, the finer the spray, and the cleaner it burns.
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Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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