Here is a 4-stroke, 8-cylinder engine model that you can display on your desk or use in a RC vehicle. This 1:10 scale engine has an all metal design. The Toyan Xpower-V8 operates at 1800-12500 RPM. It has over 100 parts that you can disassemble and reassemble.
This engine measures 12.3 x 12.7 x 3.2cm. It weighs 2.05kg. You can find this project on Kickstarter.