Heritage/History: Design/Technology(PDF), BMW Motorrad, archivado desde el original el 27 de septiembre de 2007, consultado el 10 de julio de 2015, «...the boxer had three unique innovations that would remain throughout its years in development:The engine design included transversely mounted cylinders, which were cooled by exposure to the passing air.».
*Coombs, Matthew; Haynes, John; Shoemark, Pete (2002), Motorcycle Basics (2nd edición), Haynes, p. 1•31, ISBN978-1-85960-515-8, «The transversely mounted [cylinder] V-twin, as used to good effect for many years by Moto Guzzi, slots easily into the frame, and has excellent cooling as both heads are stuck out into the wind. It also provides the perfect set-up for using shaft drive.».
Holmstrom, Darwin (2001), The Complete Idiot's Guide to Motorcycles, Alpha Books, ISBN978-0-02-864258-1, «Ducati's engines, which are longitudinal (they are positioned lengthwise in the frame) most obviously display the "L" configuration, but Moto Guzzi's engines, which are transverse (arranged croswise in the frame), are also at 90 degrees.»
breganzane.com
Battisson, Stephen (1997). «Developing the V6 - Taming The Beast». The Laverda V6. Stephen Battisson. p. 3. Archivado desde el original el 8 de julio de 2011. Consultado el 10 de septiembre de 2010. «By arranging the rest of the engine internals to rotate in the opposite direction to the crankshaft their forces are cancelled out without having to resort to the weight, complexity and friction associated with two crankshafts. ».
latimes.com
Carpenter, Susan (25 de julio de 2007), «Chaps aren't de rigueur, but a helmet, yes», ASK THROTTLE JOCKEY, «According to my source at Moto Guzzi Technical Services, "The Guzzi engine is a 90-degree 'L' twin, actually, because the cylinders are oriented at 90 degrees, instead of a typical V twin that has a smaller angle ( 60-degree, 77-degree, etc.). It is called 'transverse' because the engine is mounted with the crankshaft oriented front to back instead of left to right. Because of this you cannot run a chain or belt drive directly to the rear wheel like in most motorcycles. This is why you have a separate gearbox that bolts to the engine and transfers the power to the rear wheel via the drive shaft. This is how it is done on the Moto Guzzi and a BMW.».
motorcyclecruiser.com
Friedman, Art; Trevitt, Andrew; Cherney, Andrew; Elvidge, Jamie; Brasfield, Evans (April 2000). «Sport Cruisers Comparison - Seven Sport-Cruiser Motorcycles». Motorcycle Cruiser. Source Interlink Media. "Take a Spin" section, paragraph 4. Archivado desde el original el 2 de mayo de 2010. Consultado el 10 de septiembre de 2010. «Though the Valkyrie also has a longitudinal crankshaft, this torque reaction has been eliminated by making some of the components, such as the alternator, spin the opposite direction of the engine.»
web.archive.org
Friedman, Art; Trevitt, Andrew; Cherney, Andrew; Elvidge, Jamie; Brasfield, Evans (April 2000). «Sport Cruisers Comparison - Seven Sport-Cruiser Motorcycles». Motorcycle Cruiser. Source Interlink Media. "Take a Spin" section, paragraph 4. Archivado desde el original el 2 de mayo de 2010. Consultado el 10 de septiembre de 2010. «Though the Valkyrie also has a longitudinal crankshaft, this torque reaction has been eliminated by making some of the components, such as the alternator, spin the opposite direction of the engine.»
Battisson, Stephen (1997). «Developing the V6 - Taming The Beast». The Laverda V6. Stephen Battisson. p. 3. Archivado desde el original el 8 de julio de 2011. Consultado el 10 de septiembre de 2010. «By arranging the rest of the engine internals to rotate in the opposite direction to the crankshaft their forces are cancelled out without having to resort to the weight, complexity and friction associated with two crankshafts. ».
Heritage/History: Design/Technology(PDF), BMW Motorrad, archivado desde el original el 27 de septiembre de 2007, consultado el 10 de julio de 2015, «...the boxer had three unique innovations that would remain throughout its years in development:The engine design included transversely mounted cylinders, which were cooled by exposure to the passing air.».
