If you're interested in the mechanics of how an engine works, you might want to check out one of these mini engine kits that run on real fuel.

If you or someone you know has an obsession with understanding how combustion engines work, then check out these five antique mini-engine kits you can buy.

Based on a flathead or an overhead valve design, the Cison V8 engine kit can make up to 4.8 horsepower out of 44cc of displacement.

Right now, the Playz V8 Combustion Engine Model Kit is on sale at Amazon for just $70. You can save 30% on this highly-rated kit that is targeted towards those 12 years and older.

Walmart is selling a $100 mini V8 engine you can build yourself for just $60 One shopper called the Playz combustion engine kit “the perfect gift for anyone interested in engineering.” ...

From the May 1988 issue of HOT ROD: Mini trucks have the most V-6 and V-8 engine swap kits in the aftermarket, and they need them too!

The Toyan V8 is one of many mini engines available from online retailers. But why would you ever need one? And how much power does it make, anyway?

Take a look at this engine swap guide Volume 1, with information on parts, transmissions, mounting, exhaust, rearends, cooling systems, fuel systems, and more for your V8 conversion, at Mini ...

Specialty Engine Builders’ inclusive, ready-to-run 8-stack EFI kits eliminate guesswork and deliver knockout style.

MINI also revealed a new 2.0-liter 4-cylinder petrol engine, something they've never offered before. This one has 192 PS (189 bhp, 141 kW) and 280 Nm of torque (300 Nm with overboost).