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Weight-to-Power And Orientation Differences
Jan 13, 2018

Two engines are usually better suited for settings where quick, sudden bursts of energy are important but aren’t expected to be sustained over a long period. A jet ski, for instance, can often accelerate more rapidly with its two stroke engine than a truck could with a four stroke model, but it also is usually only made to ride for a short amount of time, whereas a truck may go for hundreds of miles or kilometers before resting. Some of this short-term efficiency owes to the two stroke engine’s lower weight-to-power ratio; these engines weigh a lot less on average, and as such can get up and going more quickly. It also takes less energy to propel them forward.

In most cases four engines can only be operated in one direction, too, while there’s more flexibility in engines with just two strokes. A lot of this has to do with the complexity of all the moving pieces, as well as the specifics of the oil sump. The oil sump, which provides lubrication to the engine, is typically only present in four stroke models, and it’s important for helping all the processes happen in differentiated ways. Two stroke engines don’t usually have this, though, which means that they’re able to be operated in almost any orientation with no risk of the oil sloshing out or getting displaced. For things like chainsaws, edgers, and other moving tools, this flexibility is often really important.

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