Merritt Zimmerman produced his own castings to build 75 of these 1/6-scale Cirrus engines (glow ignition) from about 1980 to 1994. He sold many more castings in kit form for miniature engine builders during the same period. To differentiate his engines from those built by others, an oval-shaped embossed emblem with the name Z H Cirrus was bonded to the crankcase identifying those engines completed by him. The oval emblem was not sold or included in any of the kits.This engine is 7″-long, 3″-wide, and 5″-high.
This engine differs from Zimmerman’s prototype in that the cylinders are independent of each other as in the full-size engine. The head is one piece but machined to give the appearance of individual heads characteristic of the full-size engine. The cam was relocated to the correct side of the engine and the induction system changed to provide lubrication to the internal parts before entering the combustion chamber, typical for a glow-ignition engine.