Tiny 4-Cylinder RC Engine Will get Working Three-Velocity Guide Gearbox

Combustion engines energy quite a lot of automobiles, huge and small, and scale-model ones are able to powering RC automobiles. These small engineering wonders characteristic most of the similar components and processes as a typical automobile engine, but it surely’s not a whole powertrain. A brand new video from JohnnyQ90 on YouTube reveals the method of constructing a customized three-speed handbook transmission that pairs with such a small engine.

The working handbook gearbox connects with a Howin L4-172 Nitro RC four-cylinder engine. The four-stroke, 17.2 cubic-centimeter engine has a single overhead cam, makes 2.27 horsepower (1.69 kilowatts), and encompasses a potent and functioning water pump. It weighs 2.6 kilos (1,200 grams) and is intricate, with a strengthened crankshaft, precision-machined rocker arms and camshafts, and completed in silver and black.

The construct course of started by modifying the engine’s flywheel to accommodate the clutch. A 3D-printed transmission case housed the gears, hiding them from view. Nonetheless, the case is modified later within the video to disclose them. Servos are added to function the throttle and the gear shifter through distant management, and the whole lot is then linked for testing.

It takes a bit to get the engine began, but it surely provided  nice throttle response as soon as it was working. There was a small coolant hyperlink that was simply fastened. It idled excessive, too, at round 6,500 rpm, but it surely reached simply over 14,000 at full throttle. 

Nonetheless, the transmission wasn’t excellent. Throughout testing, the third-gear canine ring broke, which led to rebuilding the half with longer enamel. Nonetheless, that wasn’t the gearbox’s solely mechanical hiccup. The second-gear canine ring snapped a tooth, but it surely didn’t hinder the operation. It continued to perform with none points.

JohnnyQ90’s channel is full of movies about scale-model engines, and this isn’t the primary we’ve coated it. He’s beforehand constructed a two-rotor Wankel engine and a 1/10-scale mannequin carbureted V8. Automobile tradition extends far past the brand new metallic on showroom flooring, and it consists of RC automobiles and their intricate, real-world powertrains.