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Originally Posted by Isaac Zachary
Of course a gasoline engine could be tuned and designed to be more diesel-like. It could be made to run much leaner, have direct injection, and if sized correctly could run most of the time at full throttle making the turbo useful. If ran lean enough the engine will actually run cooler.
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The current generation of Volvo hybrid I was refering to are all fitted with direct injection, which for turbocharged gassers had been pointed out as the way to go in order to avoid the need for a richer AFR as a knock prevention measure. When it comes to full-throttle, some gassers now don't feature the throttle anymore, such as the 1.3L turbocharged GSE fitted to some Jeeps, yet it relies on variable intake valve timing for an effect analogue to throttling.
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But things get even better with gaseous fuels like propane, natural gas and hydrogen. These can run much leaner, (30:1 for propane IIRC and even leaner for hydrogen) and practically not even need a throttle valve. Just enrich the AFR for more power, like in a diesel.
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I don't remember how the mixer system featured to some gasser engines converted to dedicated-propane for use in forklifts operate, yet I'm familiar with some CNG conversions for road-legal vehicles. Folks here often get the AFR too lean believing it would increase the savings, as natural gas actually has a greater anti-knock resistence than ethanol.