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I ain't buying the reverse rotation Porsche engine.
The Mooney thing (PFM 3200) rotated the same direction as the car engines. It had 3 gears in the gearbox so that the propeller turned the same direction as a standard engine (two gears would obviously turn the prop backward, or the engine would need to turn backward).
FWIW, aircraft engines use the flywheel side to drive the propeller, so that in effect, the engine is in there backward to its car counterpart. If you look at the crankshaft turning while running, on the drive belt/fan side, the pulley will rotate clockwise, while the flywheel side will rotate counter clockwise.
Of course someone will mention british engines or hondas, where some rotate backward, but those aren't germane to this conversation.
For reasons mentioned in prior posts, it's not possible for the engine to rotate backward for very long. As John mentioned, "dieseling" engines rotate backward, but not usually for very long, and the exhaust comes back up through the intake. And if by "backward," the OP suggests it has 4 or 5 reverse gears and only 1 forward gear, either the ring gear is installed on the wrong side OR the transmission is installed upside down. And remember on a Porsche (and air cooled VW for that matter) the fan would be rotating backward, too. Most people would notice that huge volume of air going the wrong direction.
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