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cornelius sorry for my wrong typing...im not english:) thank you blakbird i think ill give a try to sr3d... it seems really cool, i hope i can find a way to export it in 3ds or maya :)

dude this rocks! way better than the yellow one!... cant wait to see updates :)

yeah i need to drill the piston too maybe...last time i was testing the valve it blew up with only 1 bar XD due to the almost perfect sealing of the whole thing lol...but probably the best way of making it should be 2 valves in the same chamber...and i explain why: lets say we have 2 valves just like that one i posted, when the air gets into the first valve it pulls the piston and then get stuck in the valve chamber and could cause it's blown... having 2 valves under the same chamber will avoid this problem because when the first valve is closed the second one is opened so air always have a place to pass...im really near to get all of this working :D im so happy lol!

FINALLY! after some days of thinking i came out with this custom, not so orthodox, lego valve :) hrontos gave me a brilliant solution wich is this one i had to modify some pieces, i know someone of you doesn't agree with it but you know, lego lacks some pieces :P if i manage to make my motor work (and i'm really near to get this accomplished) ill send it to lego...who knows, maybe they could produce these pieces so even the purists could build this engine :P

eheh yeah mate you're probably right...im not an engineer unfortunately to know these kind of things so my "learning" proceeds by trying :P anyway even some wool wires could be good...be sure to wet them first so they will get well attached :)

yeah i know modding and drilling pieces is not orthodox...it's the same for me, i don't like it but my problem was: PF motors don't allow a vehicle to go fast unfortunately...XL motor has nice torque but it doesnt have enough rpm to build a fast vehicle...at the same way a PLE motor requires a big compressor to work...so i was looking for some feather weight engine who could pull a medium vehicle. lego unfortunately lacks some useful pieces such as valves or stuff like that (probably because it's just a toy and im forgetting it XD) so i need to "cheat" and create from scratch valves... im aiming to something powerful :D btw if you havent dismounted it yet id like to see a sealed version of your video, just to understand how much improvement could it bring :)

yeah dude! oakum is just like a string :) it's only thinner so you can apply it better...try with that, im curious to see how it goes with a better sealing :)

yeah...do you have any idea on how to make it with legos? even including drilling some pieces :P

FINALLY! drivin in my car i was thinking about the damn valve...and i came with this :) the problem now is how the hell can i make it with lego pieces ... :P help is well accepted !!!

if i understood what you meant, the air is not gonna escape anywhere because of the oakum around the piston working like the real car piston's straps

this one doesnt need so much air...i sealed it enough good and with a really weak blow the piston goes down...my aim was to use something like this lighter's gas bottle to power it... it has a good pressure because from liquid state it turnes into gas...i think it could be enough to power it...but i absolutely dont know how much torque it's gonna generate :P

here it is :) mbmc made a test and it's working...but we need to make it work properly i really hope one day we can substitute the pf engine with an air/gas one :) video

here's an idea of a possible valve system...a soft tube gets squeezed so air can't reach the piston... i definetly need to make a scheme of the tubes to figure out if it works or not...

yeah it seems to work :P ok now, we need to improve sealing of the cylinders heads, i've posted a pic picture in the other topic... you need to seal well the pistons too...mine requires really a weak blow to make the piston work anyway the idea of the M motor seem to work good :) but i had another idea :) let me build it and ill post it in half an hour

sure mate :) dont worry about writin my name :) knowledge is free

ok, here's how i solved the sealing issue... the old 4x2 plate was losing air in the middle of it so i took a normal 2x2 plate and drilled it to fit the blue piece in it... i know it's not so orthodox but it was the only way :P the problem is that a pf motor goes always at the same speed... what i'm really trying to do is something like a "real car" system... an engine, a fuel tank and a "carburetor" controlled by a PF M motor working in the same way of an autocenter steering, so it releases pressurized air only when you require it

something like this but you really need a few wires...then it's useful if you wet them in water so they will be more tidy and remain in position once you've managed to twist them around the piston's groove...another cool thing is that the oakum doesnt have too much friction inside the cylinder yeah i think it's not gonna give too much power but that also depends on how much air gets lost during the process...the more air we can save the best it's gonna work...but anyway it's gonna be great even if it just works by itself :P the problem is that powering a lego car with a pneumatic V8 requires a compressor....it's like if to power your real car you need to attach it to a container lol this model has almost no friction at all...i just need to improve the sealing of the cylinder heads...im using the wrong piece i have another one in mind...a 2by 2 studs with a single hole in the middle would be perfect...

ok...i need 4 stupid valves moved by the axis of the pistons...any idea on how to make one :P? something like this...that you can open and close using not too much energy...there has to be a way i got also another idea...let me build this and ill show you, but it's not good because it loses lot of air

yeah i knew about those switches but they seem to require a lot of energy to be activated... i have something in mind but i dont know how to make it with legos...let me draw it maybe someone of you has an idea :)

cylnders are not hermetically sealed, but anyway lets say that when piston 3 is activated the air in the 1 gets pushed again into the tube... that's why i definetly need an idea on how to direct air flood... it's quite tricky :P but i tested it by blowing some air in every cylinder and it works great even because you need just a few amount of air and pressure :P my main idea was to make a vehicle with a pressurized air tank (it could be enough even the gas to reload lighters that's pressurized) and an air engine with low consumes :) but it's gonna be enough even if it just works blowing in it lol

O.O

:P i've just finished this buggy and im really happy about it, mainly because i reached less than 500g of weight...475g to be precise it has a nice gear ratio, i dont know exactly how it is, but it has the 20pin gear on the 12pin one two times. it also features auto centering steering and led lights i put no differential to improve drift... mainly because it was disassembling itself everytime for the high gear ratio lol tomorrow ill make a video about it :P cant wait for the sun lol

yeah it was supposed to be similar to the one of this movie :P

really nice! is it also working?

Hey guys! i was just wondering why there aren't many small models with power functions... i mean, the biggest part of builders usually create huge and heavy models (often they're awesome) but the problem is that they're not fun to drive... i've seen videos with a 4x speed and they were still soooo slow :P id like to know what do you think about it :)