Fisher Technologies has developed a modern day upgrade for piston engines which dramatically improves the performance of both the gasoline and diesel engines

“Helps Promote Green Technology”

Yoke-Arm Technology – How it Works

The Fisher “Yoke-Arm” Technology for piston engines provides unprecedented advantages for both the user and manufacturer. You can see the surprising simplicity for such big time benefits with just the addition of a Yoke-Arm.

  • Substantial increases in fuel economy
  • Much lower emissions
  • Significant power increases
  • Less weight and more compact
  • Considerable increases power/weight ratios
  • Lower manufacturing costs for the same power
  • Minimal retooling required for the same power
  • Minimal retooling required for existing product lines

Yoke-Arm Advantages vs. Previous Attempts

Fisher has added a uniquely designed “yoke-arm” between the piston rod and crankshaft which is patent protected, both US & foreign (US patent no. 7,328,682). The yoke-arm is much different than previously tried yoke mechanisms such as, for example, the Bourke scotch yoke or “Bourke-Cycle” as previously discussed. The Fisher yoke-arm (shown below), an important and integral part of this breakthrough technology for piston engines, provides two main advantages over Bourke and conventional engine designs. (1) The increased piston dwell provided by Fisher is well beyond that possible with Bourke’s scotch yoke and associated “harmonic motion” for improving combustion efficiencies, and also well beyond all attempts by others. The Fisher yoke-arm can be designed for more or less dwell depending on the needs of particular applications, which is a severe constraint for the scotch yoke. (2) In addition to increased piston dwell, the added benefit of much less piston friction plus the increased mechanical advantage over conventional engines contribute to superior gains in mechanical efficiencies promoting even higher performance and added fuel economy. As it turns out, there is about a 10% mechanical advantage over the conventional engine piston rod-crank relationship.

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