Editing Straight-twin engine (section)

=== Longitudinal-engined models ===
[[File:Sunbeam S8 1951.jpg|thumb|1951 [[Sunbeam S7 and S8|Sunbeam S8]] ]]

[[Longitudinal engine]] straight-twin motorcycles are less common; however, examples include the 1930–1938 [[Dresch|Dresch Monobloc]]<ref>{{cite web |title=Dresch Monobloc 1930 500cc 2 cyl sv |url=https://www.classic-motorcycle.com/Content/Bike/dresch-monobloc-1930-500cc-2-cyl-sv/a0002 |website=www.classic-motorcycle.com |access-date=13 October 2020}}</ref> and the 1949–1956 [[Sunbeam S7 and S8]].<ref>487 cc Sunbeam. Walneck's Classic Cycle Trader, Dominion Enterprises, Dec 1996 reprinted from Classic Bike Magazine, 5 January 1950.</ref><ref name="DealerNewsNov1996" />

This engine orientation allows for a motorcycle as narrow as a single-cylinder engine,<ref name="MDATHandbook" /> which reduces the aerodynamic drag, especially for the purpose of motorcycle racing. However, the main disadvantage for air-cooled engines is that the rear cylinder runs hotter than the front cylinder.<ref name="heavy" /><ref name="UltiHistFast" />
{{clear right}}