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 - Women and Tractors - More Views From the Farmer's Wife - by Teri Burkholder. The top ten reasons why the judges wouldn't let you participate in the stock antique tractor pull: Hey, this is stock! It came with that V8 in it! That "R" on my tires stands for "really old" not radial! Blue gas? We thought it was a pretty color! What wire hooked to my throttle?
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