When the YouTuber starts the engine constructed in the video it sounds rough and likely needs a break-in period. After a while, though, and with an increased idle speed, the engine starts to smooth out and sounds excellent when revved up. Unfortunately, the starter motor fails, but the YouTuber promises that when a replacement arrives, he’ll build a three-speed transmission for the engine.
Before anyone decides to go ahead and build an RC car for the engine, it’s worth noting that most gas-powered RC car engines are two-stroke units. For the size needed, simplicity is best for reliability. However, as a fun project and bragging rights, the Stirlingkit I4 engine looks and sounds fantastic. For fun, we’re now tempted to hit the buy button and build a new RC Ford Mustang drift car for the engine.