... and portable engines for things like chainsaws and lawn mowers.Most internal combustion engines are reciprocating engines having pistonsthat reciprocate back and forth in cylinders internally ... included in this book, but which could be clas-sified as internal combustion engines, are rocket engines, jet engines, and firearms.Reciprocating engines can have one cylinder or many, up to 20 or ... modern internal combustion engines occurred in the lat-ter half of the 1800s and coincided with the development of the automobile. Historyrecords earlier examples of crude internal combustion engines...