![]() ![]() ![]() ![]() For the most part, load is analogous to throttle opening. An engine that's wailing away at 6000 RPM has to overcome far more friction (from the pistons rubbing against the cylinder walls, the bearings of the crankshaft, and the drag of things like the valvetrain, water pump, and other accessories) than an engine loafing along at 2000 RPM.Īnd higher loads have an indirect effect on fuel consumption. Host Jason Fenske explains the concept of Brake Specific Fuel Consumption, an engineering term that specifies exactly how much fuel a certain engine will consumer under various loads and at various RPMs.īasically, lower RPMs consume less fuel because lower revs mean less friction. And there's some fascinating science behind this piece of wisdom, as YouTube's Engineering Explained lays out in this new video. Getting maximum efficiency out of a manual-transmission car has a lot to do with keeping the revs low. The faster you spin your engine, the more fuel it consumes. You probably already understand the basic concept of driving a stick-shift car for maximum efficiency: Keep the RPM as low as possible. ![]()
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