Enthusiasts The Experimental Engine That Uses Gas and Diesel

21:46  03 may  2018
21:46  03 may  2018 Source:   roadandtrack.com

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A Reactivity Controlled Compression Ignition engine can achieve 60 percent thermal efficiency. That's incredible.

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A Reactivity Controlled Compression Ignition engine can achieve 60 percent thermal efficiency. That's incredible.: The Experimental Engine That Uses Gas and Diesel © Engineering Explained - YouTube The Experimental Engine That Uses Gas and Diesel

As Mazda and Infiniti have proved, there's a lot of innovation left in the internal-combustion engine. One of the more wild concepts we've seen is called Reactivity Controlled Compression Ignition (RCCI), and it could just be the holy grail of internal combustion. Why? It uses gas and diesel to achieve incredible levels of efficiency.

This engine only lives on a test bench now, as Engineering Explained's Jason Fenske details. It's a concept developed by the University of Wisconsin-Madison that in lab testing has achieved 60 percent thermal efficiency. That means this engine is converting 60 percent of its fuel used into power rather than waste energy-a much higher number than any automotive engine in production today. For context, Toyota has a new 2.0-liter four-cylinder that achieves a remarkable 40 percent thermal efficiency, while Mercedes-AMG's F1 power unit achieves 50 percent.

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It uses gas and diesel to achieve incredible levels of efficiency. This engine is more fuel efficient than a conventional diesel engine , and it's much cleaner too. It sounds like the ideal internal-combustion engine , so that might make you wonder why it's not yet in your car?

The diesel engine has always been the most efficient internal combustion engine available, but thanks to new technology, the gas engine is quickly catching up. The Experimental Engine That Uses Gas and Diesel .

An RCCI uses two fuel injectors per cylinder to mix a low-reactivity fuel, like gas, with a high-reactivity fuel, like diesel. Theoretically you could mix any low- and high-reactivity fuels for RCCI to occur, but gas and diesel is perhaps the most interesting combination.

The combustion process is quite fascinating. First, a mixture of gas and air enter the combustion chamber, then diesel is injected. The gas and the diesel start to mix as the piston moves up towards top dead center, at which point, a little more diesel is injected for ignition.

This engine is more fuel efficient than a conventional diesel engine, and it's much cleaner too. It sounds like the ideal internal-combustion engine, so that might make you wonder why it's not yet in your car? Well, the engine is still very much in development, so if it ever were to enter mass production, it wouldn't be for some time. There's also the whole issue of having to equip a car with two entirely separate fueling systems.

But, it's still a fascinating concept, and one that Fenske explores very in-depth in this video.

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