For .12 we have a term and definition in Remote Control Cars.

.12 (Remote Control Cars)

Generally, this is the smallest nitro type engine that is available for sedan R/C cars. Many kits come equipped with a .12-size engine. Some .12-size engines are more powerful than many .15-size engines, which indicates they are more efficient, have more tuning capability and/or larger carburetor openings. The ".12" refers to the displacement size of the engine in cubic inches, much like a full-size engine.

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