Thread: Diesel Economy
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Old 08-30-2015, 01:47 PM   #16
djmarchand's Avatar
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That Tohatsu data is interesting. I am surprised that their 2 cycle engines do as well as they do compared to the same hp 4 cycle engine. I thought that only the Evinrude E-Tec comes close for a 2 cycle.

But as Ski notes, the data are only at wot so who knows how good are bad they are at part throttle. I am sure that even EFI gasser engines run rich to protect valves, etc. at wot. The EPA doesn't measure emissions at wot so who cares if they run rich, right. OTOH thermodynamic efficiency is worse under part throttle conditions for a gasser unlike a diesel.

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