JoKo

crowd cheering

I did a WIP topic: https://www.eurobricks.com/forum/index.php?/forums/topic/197324-wip-15-motorcycle-engine-and-frame-motorized/ And I d'like to model it in studio.

Did you frontpage without seeing the pictures? I tried on mobile firefox and chrome, did take a few seconds for the links to turn into pictures.

Wow, that's fast! Thank you!

Hi everyone! I finally finished and shot my 1:5 scale Technic motorcycle. It's based on the 2012 KTM 690 Duke, a fun and light motorcycle I owned and loved! It has a punchy single cylinder engine with single over-head camshaft that I tried to replicate faithfully with a 3 studs bore and 2 studs stroke. bore (piston diameter) stroke (piston travel) Lego 3 stud 24 mm 2 stud 16 mm Lego x5 120 mm 80 mm Real life 102 mm 84.5 mm Features: Detailed fake engine with big bore piston, timing chain, camshaft and a lightbrick to demonstrate ignition/combustion Sequential gearbox 1-N-2-3 Detailed tubular trellis frame Suspension and steering Motorized display stand (bluetooth) Many engine and bike details (clutch, alternator, radiator with fan and pipes...) The gearbox is made with the Yamaha new pieces Pictures: Video: I hope you'll like it!

Yeah, red cams for exhaust and blue for intake. This is the correct place for the camshaft in that kind of engine Sanding the tires was not an easy decision but to my relief I think they look better now.

mechanical sketch like this? you will notice that valve timing is not right. It can be set to be correct on the left or right cylinders but it will be off on the other side. I did an "average" setting. The tires are from the 42171 AMG F1. I did not like the shiny aspect of the tread so I took them for a ride on a belt sander (80 grit) until they got this realistic worn look

Hi there! I d'like to introduce this new hot rod that I built last week. I think it will please the most petrolhead of us. It all started with a new fake engine design. (inspired by @Davidz90 prototype) I build a detailed pushrod V8 and I obviously needed to build a car around it! Hot rod was the obvious choice for an engine like that but I wanted something not only fast on a drag strip but also fast around a race track or on mountain roads. The result is this single seater open-wheel hot rod race car. It features complex independent suspension with heave springs. That means "soft" springs are activated while hitting a bump but hard springs are compressed when downforce pushes hard. This is especially useful on F1 cars or time attack cars with crazy downforce. (more about heave springs: https://youtu.be/lNInCfCkrkE?si=8iLd5RCi501bPpOs) Because I used motorcycle springs for this role, different spring length set different ground clearance. When the moc was 80% finished I could not make up my mind about what this car will look like. I finally tried three different versions: Road Legal: With lights, grooved tires, small front spoiler Track Day: With slick tires, big front wing, rear wing and diffuser Pikes Peak: bigger front wing with paper plane deflectors, roll cage, bigger side skirts and rear wing, and a huge roots supercharger to compensate for the lack of oxygen Features: Fake engine: V8 with central camshaft, pushrods, rockers and valves Two speed gearbox Independent suspension, heave springs, Ackermann steering Road Track Pikes Peak Hill Climb Fake engine & suspensions Video I hope you enjoyed this moc! Tell me what is your favorite version? If you want to build your own, DM for studio files. No money involved.

Hey, nice little one! That's a serious first car MOC I like the see-through design and of course I like the first engine design with working valvetrain even more! Nice use of the new piston pieces, have you considered using them for the final design? The piston would have a more authentic motion instead of behaving like they are valves or pushrods. Thanks for your kind word about the Fiat btw!

Once or twice a year, There is a pinned topic "Contest Index" where you can find all the Technic Contest history

Very nice design! At least as good as official models at this scale. Thanks for the instructions!

Thank you, I appreciate! The driver is obviously inspired by my TC27 entry. The main concept was "a realistic complicated engine in a car" and this oversize engine allowed me to deal with the scale problem, it is pretty big nonetheless. I don't have instruction skills but I'd like to make a studio model and maybe video instructions for the engine to explain how to get valve timing right. But right now I have a new auto-lock diff crawler on the shelf waiting for photo/video.

Hi everyone! I'm proud to show you this MOC. The Fiat s76 was a prototype race car built in 1910. It is famous for it's huge 28'000cc engine. I made a detailed model of the 4 cyl. DOHC engine with functional camshafts (2) and valves (16). The camshafts are driven by a timing chain and gears. Every valve has proper timing of course. The fake engine can be operated by hand crank at the front with one-way mechanism. The car is far from being a scale model, I meant it as a fun toy but I think the original car is still recognizable. It is remote controlled by Control+ hub, with fake engine drive and car drive by separate motors. Car features: Leaf spring suspension (flex axles) Detailed cockpit with leather seat, wooden steering wheel, ignition timing lever, brake lever... and driver (experienced, yet still reckless!) Fake final chain drive (XL motor and differential in rear axle) Display 1910 Fiat logo HUGE fake engine! Fake engine features: Hand crank and Control+ motor (can't run backwards) Full functional valvetrain with flex axle valve spring Intake manifold with giant carburetor Exhaust manifold with fire Cooling pump, hoses and radiator, oil lines I hope you'll like it !

@Appie & @Alex Ilea Thanks! I wanted to try "something new". It was really fun design the kart with dynamic driving in mind. I always had a soft spot for Lego creations like automatons or animatronics. I think there is some kind of poetry in the use of mechanical engineering to make somethin "alive".

I hope it doesn't bother the moderators, but I appreciate nice comments, even about an "old" MOC. Thanks If you like detailed fake engines I will soon show a new one, with a whole car around. Stay tuned!

OK thanks!

OK thanks for checking Let's hope it works for most! Not a good time to be invisible!

Yeah I felt weird about this at first but got used to this voting system. If you want to make it 100% fair and prevent any strategic voting or abstention the only way is to forbid participants to vote and it would change a bit the contest spirit. Like this different people can play it more or less competitive as they like and at the end of the day that's the main goal. This system has one more point: it pushes the hardcore-competitive guy to abstention, which is far better than strategic vote

Sorry I can't edit in a closed topic the pictures are visible on my browser (PC and smartphone) and I used the same method as usual. Are the pictures not visible for you all? Edit: I sized them to 1024x768, rules said 1024x1024 max is there a size limit to 1024x748?

Sorry I rushed a bit to post my entry and video but I'll reveal the head mechanism. It uses a lever, pulleys and a loop of string. With just a bit of slack to compensate for geometric approximation. That's not a simple thing to replicate, requires a bit of tuning. Not easy to make instructions, not a solution that TLG would use. But I could not find another solution with that lack of ground clearance.

Drift Kart and Driver RC Kart: Steering with exaggerated Ackermann geometry and 22° caster angle (PF servo) Rear wheels drive with two PF M motors geared up and no differential IR receiver disguised as a two-stroke liquid-cooled engine Driver: Uses battery box as body Articulated arms for steering and counter-steering Articulated head looking into corners /!\ No toggle joint piece has been harmed during final model assembly

@Mikdun @steph77 @1980SomethingSpaceGuy @Thirdwigg Thanks guys! Happy if it makes you smile! I'll show it in the final photos and video. That was the hardest system to pack in that small kart and i had to be creative on this one! The servo motor is obviously the gas tank or... whatever your fantasy is! The toggle joint mistreating infamy is no more. Was just an experiment. Sorry for the triggering picture but that's WIP

A few month ago I started my first attempt to build a lego clock, not a great success. No doubt that I will put it back on the workbench soon! Thank you for sharing your knowledge!

Wanna see it in action?

As fast as it can be! more video soon! About the unorthodox assembly... That's inside my Lego misstreatment tolerance zone but still not a good idea. it isn't a solution to any problem and kinda ugly. It's already gone.