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 - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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