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    Educational Piston Engine model diesel or gas

    created by Brickman on 2012.04.30

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    LEGO has made an engine in the past like the 1980 858/8858 auto engine, but nothing complex like a realistic 4-stroke engine with moving camshaft, pumps, valves, etc.

    This can be a perfect project for who would want to know more about how engines work and lovers of LEGO.

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    Showing some reference images from my LEGO LDI-6 (LEGO Diesel Inline 6) engine. Here it shows the 2:1 ratio gears for the camshaft. Also gears for the radiator fan and water pump.

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    A key feature would be working valves using springs and rocker arms if it is a push rod engine like this. No need for pushrods in an overhead cam engine, but pushrods makes the model more mechanical :)

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    One unrealistic part in the engine would be the LEGO piston. Pistons are supposed to be round, but this is LEGO. :) I would recomend that this part would be a special part like the Auto engines had to prevent friction.
    The piston for the LEGO version should be 4x4

    I have developed my piston better than this one, but I need to take a picture of it soon. It uses a 4x4 plate with 2x2 hole in the middle. Available in red in Pick a Brick.

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    Detail is key to a great model. Here is the fuel filter. The long silver hose to the bottom is one of the hoses for the radiator.

    The last part, is functionality. Whats a model engine without it working?
    Here is a video of my LDI-6 working with a LEGO 9V motor with a ol' LEGO train speed regulator. The LEGO version would use Power functions motor and a knob to adjust the speed.

    http://www.youtube.com/watch?v=wxTeRM2B8Hc&list=UUreMpypHM-3BQizgd-asqUA&index=12&feature=plcp
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