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Are Your Engines Good Mixers?

Why Evaluate the Cam Event for Optimized Mixing?

Kams, Inc. recognizes the importance of a cam event that is optimized for mixing of fuel gas and air.  Many other factors contribute to an engines effective mixing ability, however; as the primary flow control device the role that the camshaft plays cannot be efficiently ignored.  Evaluating the existing cam event can yield a high rate of return if the current configuration can be improved.    

Camshaft Design Objective:

Our fundamental design objectives are to Inject the total charge of fuel as early in the intake cycle as possible without scavenging fuel out the exhaust, in a shorter space of time, at higher than stock pressure.   The above listed formula provides optimized time for mixing.   An analysis of intake airflow rates, timing, and quantities can also identify the need for increased intake velocities.   Both higher velocity air and earlier fuel injection can produce a more homogenous air/fuel mixture.   The benefits of better mixing are many:

  • Improved Fuel Economy
  • Lower NOx Emissions
  • Lower Deviations in Peak firing pressures
 

Camshaft Design Success Stories:

 

KVS - Ingersoll Rand

A Michigan gas storage company is enjoying the benefits of an advanced fuel timing cam upgrade.  By advancing the cam timing of the fuel injection event over 80 crankshaft degrees both engine stability and NOx emissions improves.  In fact, NOx emissions are reduced 20% to 30% over a wide range of operating conditions.  This cam design has become an integral part of many complete clean burn packages that require much higher NOx reduction rates.  

GMV - Cooper Bessemer

A "shorter" duration fuel cam resulted in reduced fuel consumption of 7-8%.  An additional benefit of this cam is that fuel valve rebuild intervals have been extend to 1 year or more.   

7042NA VHP - Waukesha

A Midwestern U.S. gas gathering company has achieved 6-10% fuel savings on Waukesha 7042NA engines.  The customer has rpm and load limits on certain packages that prevent full utilization of engine horsepower.  The modified cam enables the engines to run at higher efficiencies with the customers package design.