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GM uses pouch cells in the Bolt not prismatic.
You can lower combustion temperature in a diesel by adopting Miller timing which reduces NOx but turbochargers are then 2-stage and more expensive. Srtill won't take enough NOx out for modern regulations. You can use gas in a compression-ignition engine by using a small amount of diesel pilot fuel to cause the ignition but whilst particulates will be much lower NOx doesn't reduce so much. Spark-ignited gas engine is an Otto-cycle and NOx is much reduced as is particulates but the issue is Methane-slip where unburnt natural gas (methane) are exhausted: toxic emissions are better but greenhouse gases much worse.
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Oct 13, 2015