Why Dual-Fuel? – It’s all about efficiency


Spark ignition / Otto gas engines typically have compression ratios of circa 10:1 with lower than circa 10:1 for turbocharged applications. Usually such engines are designed to also be able to run on petrol as well, should the gas fuel not be available.


Some OEMs have developed dedicated spark ignition / Otto engines which do not need to able to run on petrol and these have compression ratios of circa 12:1. These take advantage of CNG's higher octane number.


However, these compression ratios and therefore engine efficiencies trail that of diesel engines which have compression ratios of circa 15:1.


The G-volution Optimiser allows low cetane fuels such as CNG, CBG and LPG to be utilised in the more efficient compression ignition / diesel engine with its advantageous higher compression ratio. Alone, these fuels cannot be used in a diesel engine.


The efficiency of a dual-fuel engine in all cases, exceeds that of a spark ignition / Otto engine.


Additionally, dual-fuel engine efficiency can also exceed that of a diesel engine.


Volvo Trucks were the first manufacturer to commercialize an efficient diesel engine fuelled by a mixture of natural gas and diesel.


 “This unique technology allows us to combine the advantages of gas with the diesel engine’s high efficiency rating, which is about 30-40 percent superior to that of the spark ignition engine,” comments Lars Mårtensson, Environmental Director Volvo Trucks. “As a result, this truck consumes considerably less energy than traditional gas trucks do.”

G-volution's Optimiser is a multi-fuel technology able to deliver dual-fuel engines such as diesel-CNG, diesel-CBG and diesel-LPG. However, our technology is not restricted to just gaseous fuels. We have also demonstrated other dual-fuel concepts such as diesel-ethanol. We continue to develop other dual and multi-fuel concepts. 

Why dual-fuel? It allows use of new fuels in the more efficient diesel engine which alone could not be used in the diesel engine.

Why dual-fuel? Dual-fuel engines have lower operating cost and lower carbon output than 100% diesel engines.

Why dual-fuel? It's all about efficiency.


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