Mack Lubricant Qualification Test Methods
Mack lubricant qualification testing encompasses standardized diesel engine dynamometer tests used in the evaluation of crankcase lubricants.
Mack lubricant test qualification test methods include:
Mack T-11 and T-11A Test Methods:
- The Mack T-11 test involves the use of a Mack E-TECH V-MAC III diesel engine with Exhaust Gas Recirculation (EGR). Two 30-min oil flushes are followed by a 252-h test at constant speed and load conditions. The V-MAC III consists of an electronically controlled fuel injection with six electronic unit pumps, using 2002 model year cylinder heads. It is an open chamber, in-line, six-cylinder, four-stroke, turbocharged, charge air-cooled, and compression ignition engine. The bore and stroke are 124 by 165 mm (4 7/8 X 6 1/2 in.), and the displacement is 12 L (728 in3). This test was developed to evaluate the viscosity increase and soot concentration (loading) performance of engine oils in turbocharged and intercooled four-cycle diesel engines equipped with EGR.
- The T-11A test is equivalent to the T-11 test, with the following exceptions:
- Test length is 180 hours
- T-11 mini rotary viscometer (MRV) analysis is performed on the 180 hour oil sample
- Reduction in the amount of oil analysis performed
Mack T-12 and T-12A Test Methods:
- The Mack T12 test uses a Mack E-TECH V-MAC III diesel engine with Exhaust Gas Recirculation (EGR). A warm-up and a 1-h break-in are followed by a two phase test consisting of 100 h at 1800 r/min and 200 h at 1200 r/min, both at constant speed and load conditions. This test method was developed to evaluate the wear performance of engine oils in turbocharged and intercooled four-cycle diesel engines equipped with EGR and running on ultra-low sulfur diesel fuel.
- The T12-A test is used to provide a 100-h oil sample for a low temperature mini rotary viscometer (MRV) viscosity result.
Mack T-8, T-8A and T-8E Test Methods:
- The Mack T-8, T-8A and T-8E tests were developed to evaluate the soot-related viscosity increase performance of engine oils in turbocharged and intercooled four-cycle diesel engines. The tests utilize a Mack E7-350 mechanically-governed diesel engine. Tests are conducted on a flush-and-run format -- with a warm-up, a 2-h flush for each test, and then a constant speed and fuel rate input for the duration of the test. Typically, the engine is rebuilt before a reference (calibration) test.
- The T-8A test is 150 hours in duration, specified in the CF-4 category
- The T-8 test is 250 hours in duration, specified in the CG-4 category
- The T-8E test is 300 hours in duration and is currently used in the CH-4 and CI-4 categories
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