1989-09-01

Development of Four-Cyele Engine for Motorcycle 891801

To improve performance of motorcycle 4 cycle 250 cc engine, we examined the following. (1) We improved crank balance so that friction loss of crank shaft was reduced. (2) We reduced air intake resistance and improved exhaust system so that volumetric efficiency was increased. (3) We reduced weight of valve system parts so that maximum RPM was increased. As these improvement, we have achieved 33.1 kw/15000 RPM and torque increase in low and middle RPM range for motorcycle 250 cc engine on 1989 year model.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 43% off list price.
Login to see discount.
Special Offer: Purchase more aerospace standards and aerospace material specifications and save! AeroPaks off a customized subscription plan that lets you pay for just the documents that you need, when you need them.
X