Blog: Delphi visit
Dave Leggett | 14 October 2014
Those injectors are clever little blighters
I've been visiting powertrain people at Delphi today, hearing about some of the fascinating stuff going on there to yield engine efficiency savings.
I got a very informative tour of the lab. Two things really impressed me.
One was the precision engineering that goes into developing high pressure gasoline direct fuel injectors. The tiny holes that do the spraying are quite something and being continually looked at for further efficiency gains (eg smoothness of the hole surface, shape of the holes). And I got to see an injector unit up close (picture).
I also heard about Gasoline Direct Compression Ignition (GDCI), which is an innovation that could bring fuel economy benefits of up to 35%, I was told. That's a pretty big number. There's still a way to go with looking at the emissions treatment, but these engines could be with us in the early part of the next decade. There's no spark required in the combustion chamber and they can run on 87 octane gasoline. The US Department of Energy is putting some money into this research and Delphi is also partnered up with Hyundai. With that big efficiency gain number, I think we'll be hearing more on GDCI.
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