Olson Ecologics, an EPA certified test facility, tested ignition consistency and power output of Pulstar Spark Plugs.
A Cummins ISL G 8.9L running on CNG was installed on a dynamometer test stand and a power pull was conducted using the Cummins recommended spark plugs. A second power pull was completed after switching to Pulstar Spark Plugs and allowing the engine to get to operating temperature.
The power pull test for these large bore CNG engines takes approximately 20 minutes to complete, the dynamometer imposes a load on the crankshaft and the throttle is opened to full operation. Starting at 700 RPM and maintaining a stoichiometric mixture, the dynamometer ECU then adjusts load to achieve 1,050 RPM and maintains that RPM for roughly 2-3 minutes. The chart shows this adjustment to load and increase in RPM continuing at predetermined intervals until maximum horsepower is reached at approximately 2,000 RPM.
Represented by the red line, the OEM trace is erratic throughout the adjustments to load; indicting inconsistent ignition. The Pulstar trace is steady throughout the test, indicating improved engine stability. The test also showed a 6% horsepower gain at 2,000 RPM.
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