Re: (ET) Ariens AMP Mower

[RJ Kanary <rjkanary nauticom net>]

       I'm not all that sharp on pumping losses, volumetric efficiency and all that sort of thing............but since a Diesel engine is unthrottled, essentially becoming an air compressor when de fueled, doesn't that rob one of coasting efficiency?

A gasoline engine, being throttled doesn't get to inhale as much air as it can with each 4 stroke cycle as a Diesel does.

RJ

Jeffrey Tickner wrote:

On Thu, 14 May 2009, Christopher Zach wrote:

Since my diesel car is a manual transmission, I put it in neutral to coast 

My VW diesel actually shuts off fuel to the engine completely when I take my foot off the pedal so I don't have to shift to neutral, it's actually more efficient and there's very little engine drag since there's no throttle plate. This took some getting used to and this is also why some trucks have the 'jake brake'

Plus in NH shifting into neutral to coast is illegal.

I think this is similar to regen only when you step on the brakes to provide no drag when 'coasting'

However on my E15 with Alltrax I like the regen because when I go down my big hill it helps maintain my speed, on a tractor I don't want to accelerate downhill.

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