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Originally Posted by Billfred
if I can figure out how to make that four-cylinder engine into a three (a lego geo metro--who knew?), then I bet I'll be hot to proverbially trot.
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a 3 cylinder may be a little harder because a 90 degree angle is more often used in LEGO pieces than a 60 degree. of course there are propellers, and rotors, pulleys and wheels, angle beams and universal joints...etc,, using lego, a 4 cylinder pneumatic engine may actually be more compact than a 3 cylinder. definitly easier to make. also the timing of the valves would be a little harder. with a 2 or 4 or 8 cylinder, the valve timing just needs to be half rotation, quarter rotation, eighth rotation off. i think thats easier than a one third off.
