Alternative eco-friendly lubes for clean two-stroke engines

Innovative “Green” Tribological Solutions for Clean Small Engines

“…Same method could not be used to determine wettability of the piston ring because of the small width of the ring. Therefore, the following procedure for qualitative comparison of the wettability of the piston ring by different oils in [12] was applied: 1 µl of oil was placed on the circular flat surface of the phosphate cast iron piston ring and then, after 30 s, the extension of the oil drop along this surface was measured. The contact angle for SEMO 36 oil on the honed cast iron was the highest among all the tested lubricating oils.…”

“…Table 5. Friction coefficient and wear of the ball in tribological evaluation test of oils (DIN 51834-2) in [12].…”

“…This parameter is considered a very useful tool to compare standard tribological evaluation and simulated tests in [10]. Wear specific energy was determined using the following equation in [12]:…”

“…Therefore, these lubricating oils improve contacting surfaces wear protection since much larger energy should be dissipated to produce the same wear as compared to SEMO 4, SEMO 5 and SEMO 10 lubricants. Friction coefficient and wear specific energy in [12].…”

“…Figure 5. Average cross-section profile of the friction zone of cylinder liner samples tested using different lubricants in [12].…”