Sure, none of these tiny engines can be used in real, full-sized cars, but they definitely are conversation pieces, and not just for auto enthusiasts. They range from a quarter 4-cylinder engine to the world's smallest running V8 (above). Continue reading to see them all.
6. Quarter 4-Cylinder Engine
Built by George Luhrs, the "Quarter 4-Cylinder Engine" is touted as the smallest of its kind. It took him approximately 600-hours to complete and no details were spared during the build, as you can see from the images above. Hopefully, we'll get to see this installed in a mini vehicle sooner than later.
5. Paper V8 Engine
This fully-functional V8 Engine was made entirely from paper by Yeesjob, with the exception of its internals. It sports many moving parts, including a compound crankshaft, a rapid cooling fan, and a complex compound gearbox etc. The engine is powered by 2 x 1.5V D batteries and weighs 6.6-pounds.
4. Air-Cooled 4-Stroke Mini V12 Engine
Despite it being designed for R/C models, this 4-stroke V12 engine is touted as the world's smallest. Featuring a 21mm bore, 87cc displacement, air cooling, and two camshafts.
3. LEGO V8 Engine
Yes, an auto enthusiast has built a working V8 engine using just LEGO parts. This tiny engine peaks at a maximum of 1780 revolutions per minute, which was made possible by adding timing gears in the rear to prevent torsion in the crank and cam. Currently, it's running in a double cam setup.
2. World's Smallest V12 Engine
Sure, you can't stick this tiny V12 engine in a car, but it's fully capable of running when powered up. In addition to the inspiring movie music in the video preview, you'll see that it's "constructed with a combination of stainless steel, bronze and aluminum; the finished product runs off of compressed air and has a displacement of 12 cubic centimeters."
1. Smallest V8 Engine
With a displacement of just 44cc (3/4" bore and stroke) and measuring just 5-inches in length, this tiny V8 engine is touted as the world's smallest. Even more surprising, the only things not made by the creator of this engine are a few standard parts, the OS carburetor, and ME8 spark plugs.