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Difference between revisions of "Honda RC149"
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[[Image:Honda-RC143-riden-by-Suiss-rider-Luigi-Tatcri.jpg|right|300px|thumb|Honda RC143 ridden by Swiss rider [[Luigi Taveri]]]] | [[Image:Honda-RC143-riden-by-Suiss-rider-Luigi-Tatcri.jpg|right|300px|thumb|Honda RC143 ridden by Swiss rider [[Luigi Taveri]]]] | ||
In the Sixties, the Japanese factories, bent on the conquest of Europe, launched themselves into a crazy technological scramble for the winner's circle in the world racing championship. | |||
The RC148, used in the GP of Japan 1965, had the same bore and stroke as the | The [[Honda RC148|RC148]], used in the GP of Japan 1965, had the same bore and stroke as the [[Honda RC114|RC114]], 33 x 29 mm, but the new '''1966 [[Honda]] RC149''' gets the same dimensions as the [[Honda RC116|RC116]]: 35.5 x 25.14 mm. | ||
The crankshaft has a special configuration: the three cylinder part has the | The crankshaft has a special configuration: the three cylinder part has the crank pins at 120 degrees, the two cylinder part has the crank pins, in the usual Honda fashion, at 180 degrees. Both crankshaft are coupled together at the position of the camshaft drive. | ||
The valve angle is 56 degrees, 24 degrees for the inlet and 32 degrees for the exhaust valves. Lubrication system is by wet sump, with two oil coolers in the sides of the fairing. | The valve angle is 56 degrees, 24 degrees for the inlet and 32 degrees for the exhaust valves. Lubrication system is by wet sump, with two oil coolers in the sides of the fairing. | ||
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==Champion of the Four-Stroke== | ==Champion of the Four-Stroke== | ||
Until the ban in 1967 on 50cc and 125cc engines with more than two cylinders and more than four cylinders in the larger displacements, Honda championed the four-stroke engine, which used extra cylinders to make up for the power it lost to two-stroke models. The error of this approach was apparent in the 125cc class where [[Honda]], world champion with two and four-cylinder engines, competed against the increasingly potent two-stroke twins of Yamaha and Suzuki | Until the ban in 1967 on 50cc and 125cc engines with more than two cylinders and more than four cylinders in the larger displacements, Honda championed the four-stroke engine, which used extra cylinders to make up for the power it lost to two-stroke models. The error of this approach was apparent in the 125cc class where [[Honda]], world champion with two and four-cylinder engines, competed against the increasingly potent two-stroke twins of [[Yamaha]] and [[Suzuki]]. | ||
==Magnesium Marvel== | ==Magnesium Marvel== | ||
To counter this challenge, Honda engineer Irimajiri (designer of the marque's 50cc twins and its six-cylinder 250) created a five-cylinder four-stroke made entirely from magnesium, for 1966. This amazing feat of engineering had pistons just 35 mm in diameter and cranked out 23,000 rpm yet stalled below 17,000 rpm, forcing the rider to work the nine-speed transmission relentlessly to keep the engine running! The Honda 125 proved unbeatable in the hands of the talented Swiss cyclist Luigi Taveri | To counter this challenge, Honda engineer Irimajiri (designer of the marque's 50cc twins and its six-cylinder 250) created a five-cylinder four-stroke made entirely from magnesium, for 1966. This amazing feat of engineering had pistons just 35 mm in diameter and cranked out 23,000 rpm yet stalled below 17,000 rpm, forcing the rider to work the nine-speed transmission relentlessly to keep the engine running! The Honda 125 proved unbeatable in the hands of the talented Swiss cyclist Luigi Taveri. | ||
[[Category:Honda motorcycles|RC149]] | [[Category:Honda motorcycles|RC149]] | ||
[[Category:Honda RC series|RC149]] | [[Category:Honda RC series|RC149]] | ||