Studies On Amphibian Two-stroke Oils And Evaluating Techniques

Based on the evaluating techniques and equipment of NMMA TC-W3 oils andJASO FC oils, the proposal of evaluating technique for amphibian excellentenvironmental protection type two-stroke oil was put forward in the dissertation,which included detergency test procedure, lubricity test procedure, and smoke testprocedure for evaluating amphibious two-stroke gasoline engine oils.By research on the evaluating technique for excellent air-cooled, andexcellent water-cooled two-stroke oils, the detergency test procedure forevaluating amphibious two-stroke gasoline engine oils was established. Andcorrespond to the test procedure, the test-bed, adopting single cylinder, liquid-cooled,Piaggio 180 engine, was established, which was applied to evaluate detergency ofamphibious two-stroke gasoline engine oils.The lubricity test procedure for evaluating excellent water-cooledtwo-stroke oil (TC–W3 oils) was introduced to evaluate the lubricity ofamphibious two-stroke gasoline engine oils. And the test-bed adopting air-cooledHONDA AF 27 type engine was founded——the test-bed for evaluating detergencyof amphibious two-stroke gasoline engine oils.The smoke test procedure for evaluating excellent air-cooled two-stroke gasolineengine oils was used for evaluating smoke of amphibious two-stroke gasoline engineoils. A t the same time the test-bed for evaluating excellent air-cooled two-stroke oils(JASO FC) was utilized to evaluate the smoke of amphibious two-stroke gasolineengine oils.Selected different excellent water-cooled two-stroke oils (NMMA TC-W3 oils)to test on the outboard engine secure test rig and on the OMC J70 outboard engine testrig. The result indicated that the trend of data was consistent with the trend of datafrom the test-bed for evaluating detergency of amphibious two-stroke gasoline engineoils. And the test-bed differentiated different oils distinctly.Selected different air-cooled two-stroke reference oils to test on the test-bed forevaluating detergency of amphibious two-stroke gasoline engine oils. The resultindicated that the detergency of air-cooled two-stroke oils was more excellent thanthat of water-cooled two-stroke oils (TC–W3 oils). And the detergency criterion ofamphibious two-stroke gasoline engine oils was established.Validating tests were experimented on lubricity test-bed, and smoke test-bed forevaluating amphibious two-stroke gasoline engine oils. The results were validated tobe correct.Used Visual C++ program language, the program for the lubricity proceduresfor evaluating amphibious two-stroke gasoline engine oils was developedindependently. This program could automatically real-time collect datafrom the system of test-bed and deal with the data, could improve themeasure precision, and relieve the test worker.Selected the US compound addictive (S833) for TC-W3 oils to confectthe oil that conformed to TC-W3 standards, namely standard oil. Servedthis standard oil for base oil to confect the amphibious two-stroke gasolineengine oils, through added some addictives to lower the smoke and lessen the deposits,at the same time, enhanced the formulation to keep its lubricity etc. Thenumber of amphibious oil samples was six.By analyzing the amphibious oil samples, sample 1 that conform to viscosityclass SAE 20 and sample 5 that conform to viscosity class SAE 30 were selected.Sample 1 and sample 5 were tested on the amphibious oil evaluating test-bed.The result indicated that sample 5 passed the detergency test and the lubricity test forevaluating amphibious two-stroke gasoline engine oils, but the smoke test. However,sample 1 passed all the tests of amphibious two-stroke gasoline engine oils, that is tosay, sample 1 conformed to the criterion of excellent air-cooled two-stroke oils (JASOFC oils) as well as conformed to the criterion of excellent water-cooled two-strokeoils (TC-W3 oils).