What does the R stand for in SiR. Anything? I thought I read somewhere, or maybe it was a rumor that SI meant Sport Injection or something. I found it. In an issue of HTM it says it means Sport Injection.

A Classic's Origins

The Civic's roots date back to '73, but it wasn't until 12 years later that U.S. car buyers would have the opportunity to get their hands on the performance icon known as the Si. First offered as a CRX, hatchbacks became available the following year for those desiring four seats.

An acronym for "sport injection," the Si became the first Civic to incorporate a fuel-injected, 1.5-liter powerplant, bidding good-bye to the age of carburetion. Early Si's quickly became synonymous with performance, featuring 14-inch wheels mated to high-performance tires, a monotone paint scheme and sport seats.