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Originally Posted by cRiPpLe_rOoStEr
So, unless CVTs become a thing on big rigs (some agricultural tractors already resort to it), you think the 53% thermal efficiency claim is only halfway truth?
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* According to Ricardo Engineering, a 12-speed transmission has the same mechanical efficiency as a CVT, so that would require a 'doubling' of what is commonly in use.
* The 'formerly most efficient' 'diesel' engines were as the Hitachi units, used for cargo ships. They were 46% BTE, as big as some mobile homes, pistons as tall as an adult male, and operated at a constant 130-rpm, on 'bunker fuel.'
* And presently, Daimler-Benz' Freightliner, diesel-electric hybrid tractor-semitrailer, has a BTE-e of 55%, adding regen into the mix.
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Weichai may have 'achieved' 53% on an engine test-stand, under some arbitrary load constraints, in a laboratory setting.
They need to provide bona fides 'where the rubber meets the road.'
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The engine may have to be made of 'ceramics', with its tribology based upon vapor-phase- lubrication technology, rather than conventional hydrodynamic lubrication, as is the global industry standard.