|The lego-loving folks build the Lego Pneumatic Engines(EUR 300; $400) for your Lego models(trucks, cars, construction machinery), using the Scotch Yoke of operation in order to keep size to a minimum, and to maximize usable torque, giving better overall power output. The 2000 rpm inline-4 model features a cross-plane crank, a gear-driven valvetrain and a side-mounted dual cam with one valve-per-cylinder. The inline-3 model features a similar setup but delivers 600 rpm more.
"The engine is only 11 studs high, making it a perfect choice for fast (approximately 1:10 and bigger scale) LEGO cars, construction machines, agricultural vehicles and other MOCs." Check out see the videos, they are very cool!
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