Posted May 21, 20222 yr For a long time I wanted to build a large scale engine with functional valves. I decided to try one of my favourite motorcycle engine: The mighty single-cylinder from Austria. LC4 stands for Liquid Cooled 4 valves. The exact displacement is 698cm3, revs up to 8000rpm. It's the most powerfull roadbike single-cylinder ever, up to 72hp on the some bikes and it's feather lightweight (bikes under 150kg) It appeared in 2007 and evolved until today. I's now fitted in KTMs Husqvarna and Gasgas. Mine is now in pieces for maintenance (60 000km), ti's a 2012 KTM Enduro R, with single overhead camshaft. The basic scale is 1/2. It means the piston diameter, valves diameter and distribution sprockets are not too far from 1/2. Then I built and added features regardless of scale. It's getting far from a scale model and turns into a funny single-cylinder ~75cm3. Piston: Valves: Camshaft: And the current state of the engine. Left side with distrib chain and alternator And right side with a yellow lightbrick as sparkplug, a turntable as clutch, and a huge out of scale water pump. I'd like to add a red lightbrick to illuminate the whole combustion stroke. The sparkplug blinks shortly, I like that. in my dream I can figure a functionnal clutch and sequantial gearbox. An injection body with butterfly valve and some kind of exhaust coud be nice too. So more to come with video, I promise!
June 7, 20222 yr Now this is something! You could add one or more rubber bands on the flanges of the red rim, so it would look like piston seals.
June 7, 20222 yr Author 21 minutes ago, vascolp said: Very cool! In the right side is it the carburator butterfly valve? The butterfly valve, yes. Carburator no. Carburators on single-cylinder usually have sliding valve. It's just two rims to figure a injector body with a cone and butterfly valve. It can be open/closed Edited June 7, 20222 yr by JoKo
June 8, 20222 yr Author 14 hours ago, Milan said: Now this is something! You could add one or more rubber bands on the flanges of the red rim, so it would look like piston seals. Yeah good idea. One would fit in the groove for the tire without rubbing. Would be a nice touch but I don't have correct size rubber for now. Will look for one with good color contrast.
August 19, 20222 yr Awesome, love it. I would love to build this and display at Lego shows along with my Technic motorcycle collection. Any chance of some instructions or a few more photos?
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