Wilson, Hugo (1995). «Glossary». The Encyclopedia of the Motorcycle. London: Dorling Kindersley. pp. 309–310. ISBN0-7513-0206-6. «in-line Engine layout in which the cylinders are arranged in a row, and in-line with the wheels of the machine... parallel twin A two-cylinder engine layout in which both cylinders are side by side and mounted across the frame.»
Henshaw, Peter (15 de septiembre de 2012). «Two–Engine». How Your Motorcycle Works: Your Guide to the Components & Systems of Modern Motorcycles. Veloce Publishing. p. 19. ISBN978-1-84584-494-3. «Unmachined forging of a 270-degree crankshaft for parallel-twin engine. (Honda)».
«BEST IN CLASS: BEST 2-UP ATV». Dirt Trax Magazine. 9 de marzo de 2012. Archivado desde el original el 17 de diciembre de 2013. Consultado el 6 de agosto de 2012.
«World's cheapest car launched: Tata Nano». Autocar (Haymarket Consumer Media). Consultado el 12 de julio de 2012. «The twin-cylinder, 623cc petrol engine powering it drives the rear wheels, and sits directly above them to the right of the rear of the car, with a four-speed manual gearbox immediately to its left.»
Henshaw, Peter (15 de junio de 2008). «Super Bantam». The BSA Bantam Bible: All Models 1948 to 1971. Veloce Publishing. p. 42. ISBN978-1-84584-159-1. Consultado el 13 de julio de 2012. «...and the Sunbeam S7, that civilised but low-powered shaft-drive in-line twin that BSA hoped would fill a niche as a gentleman's machine...»
Antique cars Michael Sedgwick, 1980 - 93 pages "The engine, an inline twin, lived in a box like a meat-safe at the rear."
Popular Mechanics - Feb 1989 - Page 109. Vol. 166, No. 2 - 136 pages - Magazine "Also new from Suzuki are the inline twin 15 and the inline 3-cylinder 25. Both are equipped with loop-charging, oil injection and external-mount tilt and trim. The 25 also has pre-atomized oil injection and an overrev limiter."
Machine Design: Volume 54, Issues 1-6; Volume 54, Issues 1-6 1982 "A modified snowmobile power plant, the 30-hp inline twin has been detuned by lowering the compression ratio and modifying the carburetion"
Ultralight aircraft Michael A. Markowski - 1982 - 320 pages - "The Cuyuna 430-D is an inline twin cylinder of 30 hp."
Snowmobile Service Manual, p. 297, en Google Libros Intertec Publishing - 1986 - 488 pages "Engines consist of two types; the axial fan, inline twin and the simultaneous firing opposed twin.
«Tata Nano Diesel». Girnar Soft Automobiles. Consultado el 21 de enero de 2014.
com.jm
books.google.com.jm
Brooke, Lindsay (5 de enero de 2003). «Chapter Two: Speed Twin and Tiger 100». Triumph: A Century of Passion and Power. MotorBooks International. pp. 36-37. ISBN978-0-76030-456-3. Consultado el 8 de septiembre de 2012. «Stylish, light, responsive, smooth, and refined, the Speed Twin changed the direction of motorcycle design and dominated it for thirty years.»
Oliver, Lance (December 2004). «Parallel Universe». En Bill, Wood, ed. American Motorcyclist (Pickerington, Ohio: American Motorcyclist Association) 58 (12): 13. ISSN0277-9358. Consultado el 8 de septiembre de 2012.
Dean, Paul (May 2005). «Service: Oil miser». En Edwards, David, ed. Cycle World (ISSN 0011-4286) (Newport Beach, CA USA: Hachette Filipacchi Media) 44 (5): 160. Consultado el 26 de mayo de 2013. «Un doble en V de gran diámetro enfriado por aire, en particular, puede calentarse mucho, especialmente el cilindro trasero, que no está expuesto a tanto aire de refrigeración como el delantero.»
Cocco, Gaetano (2004). «Chapter 11: The Engine». Motorcycle Design and Technology (English edición). St. Paul, MN USA: Motorbooks International. pp. 117-118. ISBN0-7603-1990-1. Consultado el 9 de septiembre de 2013. «In some construction layouts the tranverse width is the same as a single-cylinder engine, which allows very narrow frames and bodywork with small frontal areas.»
Holmstrom, Darwin (4 de diciembre de 2009). BMW Motorcycles. Brian J. Nelson, photographer. MotorBooks International. ISBN978-0-76033-748-6. Consultado el 10 de septiembre de 2012.
Holcolmb, Hank (October 1964). «Inside Today's Outboards». En Juettner, Walter R., ed. MotorBoating (New York, NY USA: Hearst) 114 (4): 34-35. ISSN1531-2623. Consultado el 18 de mayo de 2013.
Windsor, Henry Haven (Jr.), ed. (September 1957). «Tomorrow's Outboard – What Shape Will It Be?». Popular Mechanics (Chicago, Illinois) 108 (3): 150-152. ISSN0032-4558. Consultado el 14 de julio de 2012. «The required gearing tends to be both noisy and expensive. For this reason the square type probably will never see service as an outboard motor».
Oliver, Lance (December 2004). «Parallel Universe». En Bill, Wood, ed. American Motorcyclist (Pickerington, Ohio: American Motorcyclist Association) 58 (12): 13. ISSN0277-9358. Consultado el 8 de septiembre de 2012.
Ried, Rick (December 2001). «British Heritage, American Style». American Motorcyclist (Pickerington, OH USA: American Motorcyclist Association) 55 (12): 18-20. ISSN0277-9358. «...the America utilizes a 270-degree crank. That gives the America a lumpier cadence at idle that's a fair replica of a V-twin beat, although updated balancer shafts keep the vibrations under control.»
Holcolmb, Hank (October 1964). «Inside Today's Outboards». En Juettner, Walter R., ed. MotorBoating (New York, NY USA: Hearst) 114 (4): 34-35. ISSN1531-2623. Consultado el 18 de mayo de 2013.
Windsor, Henry Haven (Jr.), ed. (September 1957). «Tomorrow's Outboard – What Shape Will It Be?». Popular Mechanics (Chicago, Illinois) 108 (3): 150-152. ISSN0032-4558. Consultado el 14 de julio de 2012. «The required gearing tends to be both noisy and expensive. For this reason the square type probably will never see service as an outboard motor».
Parsons, Grant (February 2003). «Top Gear: Polaris 600 Sportsman Works Hard and Plays Hard». En Wood, Bill, ed. American Motorcyclist (Pickerington, OH USA: American Motorcyclist Association) 57 (2): 16. ISSN0277-9358. «Underneath the bodywork, you'll find a 597cc overhead-valve parallel twin with two valves per cylinder, fed by a 34mm carb.»
Taylor, Rich (May 2003). «Fighter Jets». En Oldham, Joe, ed. Popular Mechanics (Hearst Magazines) 180 (5): 114-117. ISSN0032-4558. «Powered by a turbocharged 4-stroke Parallel Twin that has half the displacement of the Sea-Doo's supercharged GTX, the lightweight Polaris MSX 150 is almost as fast and $2200 less expensive.»
Samson, Jack, ed. (October 1972). «Quieter & Safer: the '73 machines». Field & Stream (New York, NY USA: CBS Publications) 77 (6): S10 - S14. ISSN8755-8599. «The important power plants will now be 399 to 440cc parallel twins.»
«2008 Honda Silver Wing ABS Review». Motorcycle.com. Verticalscope. 12 de junio de 2008. Archivado desde el original el 27 de julio de 2010. Consultado el 11 de julio de 2012. «The engine is no longer an oversized, vibration-prone single but a smooth and reasonably powerful in-line twin.»
motorcycleclassics.com
Davis, Simon (May–June 2013). «Triumph's First Twin: Triumph 6/1». Motorcycle Classics. Topeka, Kansas, USA: Ogden Publications. p. 1. Consultado el 26 de abril de 2014.
Davis, Simon (May–June 2013). «Triumph's First Twin: Triumph 6/1». Motorcycle Classics. Topeka, Kansas, USA: Ogden Publications. p. 2. Consultado el 26 de abril de 2014.
motorcyclenews.com
«Yamaha T-Max (2001-2011)». Motor Cycle News. Bauer Media. Archivado desde el original el 30 de septiembre de 2010. Consultado el 8 de septiembre de 2012. «Engine specification 4 stroke, parallel twin, auto».
«Yamaha T-Max (2001-2011)». Motor Cycle News. Bauer Media. Archivado desde el original el 30 de septiembre de 2010. Consultado el 8 de septiembre de 2012. «Engine specification 4 stroke, parallel twin, auto».
«2008 Honda Silver Wing ABS Review». Motorcycle.com. Verticalscope. 12 de junio de 2008. Archivado desde el original el 27 de julio de 2010. Consultado el 11 de julio de 2012. «The engine is no longer an oversized, vibration-prone single but a smooth and reasonably powerful in-line twin.»
«BEST IN CLASS: BEST 2-UP ATV». Dirt Trax Magazine. 9 de marzo de 2012. Archivado desde el original el 17 de diciembre de 2013. Consultado el 6 de agosto de 2012.
