When it comes to engines, size usually matters, but these four examples show that might not always be the case. Continue reading to see them all. Click here for first picture in gallery.

The Quarter 4-Cylinder Engine

According to TechEBlog reader Pamela, this is the “world’s smallest functional 4-cylinder, 4-cycle, spark ignition engine.”

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.

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World’s Smallest Supercharged V8 Engine

his miniature four-stroke V8 engine has a 1.000-inch bore, 0.900-inch stroke, 9:1 compression ratio, 12,000rpm max., rotary sliding vanes (supercharger), dual WALBRO carbs, dual electronic ignition, and a two stage dry sump oil system.

Paper V8 Engine

This fully-functional V8 Engine was made entirely from paper, with the exception of its internals. It sports many moving parts, which include “a compound crankshaft, a rapid cooling fan, 8 rods, 8 pistons and a complex compound gearbox etc.”. The engine is powered by 2×1.5V D Batteries and weighs 2.98kg. From start to finish this model took one year to design and construct