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 - A Question for Dads This recent topic from the Tractor Talk discussion board is being highlighted because it is an awesome display of the caliber of individuals that have made this site their own. The young person asking questions received positive feedback and advice from total strangers who "told it like it is" with the care many reserve for their own kids. The advice is timeless... so although it isn't necessarily antique tractor related, it will be prominently displayed in our archives to honor those who have the courage to ask and those who have the courage to respond in an honest, positive manner.
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