Browse Publications Technical Papers 2004-32-0034

Development of Four-stroke Outboard Motor 2004-32-0034

The purpose of this paper is to describe some technical features of a new type 4-stroke outboard motor, the DF250.
This model is a 4-stroke V6 outboard motor, and has the largest displacement 3,614cc and the highest maximum power 250 ps in the marketplace. The model possesses a number of remarkable features of compact engine layout, maximum output power 250 ps, high-flat torque from low to high engine revolution, and low vibration:
  1. 1)
    In order to make the engine compact, the following are adopted: V-bank angle of 55 degrees, twin throttle bodies, offset driveshaft system and two-stage camshaft drive system.
  2. 2)
    The following systems apply to this model to achieve both high output power and high-flat torque:
    • Continuously variable valve timing system (VVT)
    • Variable air intake pipe length system
  3. 3)
    To reduce vibration, the offset driveshaft system is adopted.


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


Members save up to 43% off list price.
Login to see discount.
Special Offer: With TechSelect, you decide what SAE Technical Papers you need, when you need them, and how much you want to pay.