SwRI: Cummins M-11 EGR Test, API CI-4 and Cummins CES 20078, high soot, lubricating oils, ring wear

	For the Cummins M-11 EGR procedure method at SwRI, 150 hours are spent at 1,600 rpm, overfueled and 150 hours at 1,800 rpm, overfueled, and retarded timing, in alternating 50-hour segments.

The Cummins M-11 EGR procedure method determines the effectiveness of lubricating oils in reducing soot-related wear of overhead components in engines with exhaust gas recirculation (EGR). Heavy-duty, on-highway trucking operations after 2002 are simulated.

Cummins M-11 EGR Test Equipment and Procedure

The test engine is a modified Cummins ISM 425 engine rated at 425 bhp and 1,800 rpm, with EGR. The Cummins M-11 EGR test is part of API CI-4 and Cummins CES 20078.

The test is a 300-hour engine test evaluating:

• Overhead wear

• Filter plugging

• Sludge

For the test, 150 hours are spent at 1,600 rpm, overfueled, and 150 hours at 1,800 rpm, overfueled, and retarded timing, in alternating 50-hour segments.

Test Results

	Example of PASS results	Example of FAIL results

Test parts evaluated include:

• Engine crossheads for weight loss

• Engine oil filter for plugging via change in pressure drop

• Engine valve cover for a sludge rating

• Oil pan for a sludge rating

Every 25 hours, used lubricant samples are analyzed for:

• Viscosity at 40 °C

• Viscosity at 100 °C

• Total base number (TBN)

• Total acid number (TAN)

• Wear metals

• Additive metals

Pass/fail criteria at the end of each test include:

• Average crossheads, weight loss, 20.0 mg at 4.6 percent soot, max.

• Engine oil filter, plugging via change in pressure drop, 275 kPa at 250 hrs max.

• Engine valve cover and oil pan, sludge rating, 7.8 merits, min.

For more information about the Cummins M-11 EGR test capabilities at Southwest Research Institute (SwRI) or how you can contract with SwRI, please contact Scott Richards at srichards@swri.org or (210) 522-3567.