LEGO Pneumatic Engine L4
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Uploader Comments (ricardocrl)
All Comments (113)
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@MrDinkdank That may well be true, of course there is could be a huge difference in build quality. But the lego hoses pop at about 2 bar, so nothing to worry about.
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@thijsloon Just so you know,when we made some bottle rockets we tested 2 litre pop bottles and most failed around 100psi ( about 7bar) so be carfeful.
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sux
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@farmingpower1066 Also, it is better to use gear wheels between the 2 cylinders. The cams have to have a 30 degrees difference between them to get each other pulled out of the dead point. You can adust this easily using the gears. However, 45 degrees will work fine too, but not as good. Don't forget to lube your cylinders with some fat. If this didn't help, try to manually operate the switches to let the motor work. Maybe it's just bad timing of the switches
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@farmingpower1066 Start off using 2 cylinders and 2 valves. The cam-lego-parts (egg-shaped flat pieces) suit the best to cover all of the stroke of a cylinder. In this video, he uses the hooked parts. They are just not long enough to cover all of the stroke. Here, there are 4 cilinders and 2 valves. How, you may ask? well, because 2 of the cylinders are actually reversed.
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i am trying to build a two cylnder but the pistons get stuck at top dead center and wont countaly go around do u have any tips?
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cool
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Very cool
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In 20 years... he is in china.
1 year ago 2
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it would probably reduce the stress on the crankshaft to change the firing order.
1-3-4-2 and 1-3-2-4 are both worth testing.
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You can also use a regular soda bottle and make a small hole at the top. here you can push through a plastic stick of a lollypop. If you have hot a compressor at home(e.g. for your bike) you can make a second hole for a air-valve. this way you can go on for minutes whithout the need to pump. don't be afraid of a explosing bottle, they are made to resist a pressure of 10 atmosphere(142 psi, correct me if i'm wrong)
thijsloon 3 years ago
Don't know the numbers! ;) Actually an electric compressor would be welcome, like those we see in lots of pneumatic engine videos. Thanks for the tip!
ricardocrl 3 years ago
I built your engine to see how it would work for myself and you really need to pump frantically! i used 2 hand pumps and it still went slow! That doesent matter in a lot of situations. Anyway great concept! very simple.
properpropeller 3 years ago
Yes, it's simple to build, but not very smooth! It was a good beggining.. needed more time and patience! Thanks for looking and testing! ;)
ricardocrl 3 years ago