No sooner had Yamaha whipped the wraps off the new V-Twins than an emotional debate was created, Yamaha officials said they had no intention of copying Harley Davidson, nor of luring away a chunk of Harley’s market. The ads for the Vee, though shouted that all the classic engine configuration lacked until 1981 was Yamaha engineering. There were people who reacted to that with Right And about time, and there were those who said The rats Have they no shame. Ideological debates have their place, but that place is not the test and introduction of a new motorcycle. For that reason we present adjacent to but not included in the test of the Yamaha XV 750 Virago, a brief review of the V-Twin engine. The first time such a configuration appears in our history books was the year 1907, The engine was an Indian. Harley’s Vee arrived two years later and ever since, in every country with the industrial capacity to design and produce motorcycles, Vees have come, gone and endured in bewildering variety. The Vee is a wonderful way for a motorcycle engine to be, Those early examples had an included angle of 45° or less and the cylinders were inline, that is, fore and aft both because that allowed a narrow engine, smoother and more powerful than a Single and also tucked nicely within the confines of the bicycle style diamond frame of the day. Later the Vee was appreciated because the primary and secondary imbalances of a Single become harder to control with a vertical Twin, but help balance each other out if you put the two cylinders at an angle to each other. The exact angle doesn’t seem to matter, as engineers then and ever since have used angles of 45, 50, 72, 75, 80, 90 and even 120°. Mostly it’s a matter of how high, narrower is higher or how long wider is longer the design must be to fit the target wheelbase or seat height or any of the other thousand things that go into a preliminary design. Vees have come with sidevalve, overhead valve and overhead camshaft valve trains. They’ve been fore and aft, and across the frame 250 to 1340cc, air cooled and water cooled all because the layout is terrific.
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21 авг 2024
