Study: some compressed natural gas (CNG) conversions not helpful to enviornment
The problem here is not the fuel type, it's the engine. The study found that there were high emissions of methane coming from the 2-strokes because as much as a third of the CNG is sometimes improperly burned. Methane is a greenhouse gas and has a global warming potential significantly higher than CO2. In addition, unburned lubricating oil in these engines produces substantial high particulate matter emissions.
The study also tested 4-stroke engines, and these had significantly lowered emissions across the board. In fact, according to the researchers, it would have been better for the environment – and cheaper overall – to simply upgrade the 2-stroke engined rickshaws to the cleaner gas-burning four-stroke models. Well, now we know.
[Source: Science Daily | Image: Carol Mitchell – C.C. License 2.0]
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