1992 Cummins Diesel Smoke Test | California Opacity Results
1992 Cummins Diesel Smoke Opacity Test
Independent California diesel smoke opacity testing demonstrates Cerma STM-3 treatment's effectiveness on a 1992 Cummins diesel engine. This test uses official California emissions testing equipment and methodology.
Test Equipment & Details
| Parameter | Details |
|---|---|
| Testing Service | J.L. John Services, Inc |
| Meter Manufacturer | Red Mountain Engineering, Inc |
| Engine Year | 1992 |
| Engine Type | Cummins Diesel |
| Model | Smoke Check 1667 |
| Horsepower | 350 HP (3.69C Engine) |
| Vehicle Inspection | OK |
Testing Methodology
This test is currently used for measurement of particulate in diesel trucks' stack exhaust in California. The equipment consists of:
- Telescopic pole (9-12 ft) with laser/optical measurement device
- Triangular shaped apparatus for exhaust pipe measurement
- Hand-held computer with recording/printing mechanism
- Bung placed directly into exhaust stack
Test Procedure
- Truck placed in idle position
- First measurements calculated at idle
- Tester steps on accelerator and holds at set RPM for approximately 5 seconds
- Test repeated several times with computer recording results
- Final report calculates particulate/opacity of diesel exhaust under load
Results: Base Tested After STM-3
The test results show significant reduction in smoke opacity after Cerma STM-3 treatment was applied. This demonstrates the technology's ability to reduce harmful diesel emissions and help vehicles pass California's strict smoke opacity standards.
Why This Matters for Diesel Owners
- Pass emissions testing – Reduce smoke opacity to meet California standards
- Reduce environmental impact – Lower particulate matter emissions
- Improve engine performance – Cleaner combustion means better efficiency
- Extend engine life – Less carbon buildup protects components
Cerma Products for Diesel Smoke Reduction
If you're experiencing smoke issues with your Cummins diesel engine, Cerma offers treatments designed to clean, protect, and optimize engine performance:
- Cerma STM-3 Engine Catalyst – Removes carbon buildup and treats metal surfaces
- Cerma Engine Treatment – Creates permanent SiC ceramic coating
- Cerma Diesel Motor Oil – Full synthetic with self-cleaning technology
By using Cerma products, you can keep your 1992 Cummins diesel engine running smoothly and efficiently for years to come.
Questions? Call 239-344-9861 or email Info@cermatreatment.com
View Complete Test Documentation
Review the official California diesel smoke opacity test report below:

