ISBN: | 978-5-5127-9297-1 |
High Quality Content by WIKIPEDIA articles! The Lycoming R-680 is a nine-cylinder air-cooled radial engine, the first engine produced by Lycoming. The engine was produced in two types the E and B series both are essentially the same, the B4E was available in a trainer version with a front exhaust collector for use without cylinder air baffles.