On Mon, Jul 28, 2008 at 08:08:15PM -0500, Elton E. (Tony) Clark wrote:
> *Okay, open your minds . . . the guy on the next bar stool opines that on
> his straight six '95 Jeep Cherokee work car, he is considering removing the
> rocker arms and pushrods on every other cylinder in the firing order and
> running it on three cylinders to save gas.. The closed cylinders would
> resist rotation on compression but rebound on downstroke with little loss
> except friction. *
> **
> *I'm thinking this would probably work for some saving but at a steady
> state throttle opening, won't it just require about the same fuel to achieve
> equilibrium with the wind resistance and rolling resistance?
Yes.
If it's driven at the same speed, the only savings will be the lack
of valve train friction in 3 cylinders.
That's not zero, but it's not very much.
Switching to highway tread tires would do more. As would
keeping the tires a bit over inflated. Or using the Cheroke to
haul a bicycle to within commute distance to work and riding in.
Of course halving the power would encurage a more sedate driving style
which itself would result in increased mileage. But he could do that
without touching the engine just by driving slower.
Eric
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