Inline engines have just one line of pistons. V engines have two different lines of pistons arranged in a v relative to each other. Rotary engines have no pistons, but rather have a triangle-ish thing inside of a rounder housing. Rotaries are interesting for a number of reasons; one can get equal power out of less displacement. They also tend to be very high-revving, which is cool. The downside is that it's hard to produce a lot of torque with them.
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