1992 Cummins Diesel Smoke Test - Opacity Results

This page documents independent diesel truck smoke opacity testing performed on a 1992 Cummins engine before and after Cerma STM-3 treatment.

Test Equipment & Facility

• Testing Service: J.L. John Services, Inc
• Meter Manufacturer: Red Mountain Engineering, Inc
• Engine: 1992 Cummins (S/N: 8500240)
• Smoke Check Model: 1667
• Engine HP: 350
• Vehicle Inspection: OK

How the Test Works

This test measures particulate in diesel trucks' stack exhaust in California. The equipment consists of a telescopic pole (9-12 ft) with a triangular shaped apparatus housing a laser/optical measurement device connected to a hand-held computer and recording printer. The measurement device measures smoke/exhaust across two points using laser light refraction.

Test Procedure

The truck idles while first measurements are calculated. The tester then steps on the accelerator and holds at set RPMs for approximately 5 seconds. This test is repeated several times and measurements are recorded and calculated to determine the particulate/opacity of the diesel exhaust under load.

Test Results After STM-3 Treatment

Measurement	Baseline	After STM-3	% Decrease
Test 1	7.02	6.48	-8.33%
Test 2	6.96	6.04	-15.23%
Test 3	6.86	5.78	-18.69%
Average	6.95	6.1	-13.88%

Key Findings

After Cerma STM-3 treatment, the 1992 Cummins engine showed a 13.88% average reduction in smoke opacity. This demonstrates Cerma's ability to improve combustion efficiency and reduce particulate emissions in diesel engines.

View Full Test Documentation

The complete smoke test report is shown below:

Questions about Cerma for your diesel engine? Call 239-344-9861 or email Info@cermatreatment.com