Comparative study of engine performance and emission test of Custard Apple seed oil Bio-lubricant dispersed with micro walled carbon nano tube with synthetic lubricants

Finiteness of global crude oil reserve, increasing crude oil prices and problems related to environment seems to be a reality check for the issues of emerging generation. Vegetable oil based lubricants are an attractive alternate to conventional petro based lubricants due to number of its physical properties like renewability, biodegradability, high lubricity and high flashpoint. Direct application of vegetable oil as vehicle lubricants is less favourable due to its poor thermo oxidative stability, cold flow behaviour and poor anti-ware characteristic. Present research detailed in this document refers to chemical modification of custard apple seed oil through epoxidation, hydroxylation and trans esterification process to improve its thermo- oxidative stability and cold flow behaviour. The micro walled carbon nanotube(MWCNT) of size 30-50nm of .5 wt % concentration was dispersed in this chemically modified custard apple seed oil to improve antiwear properties using ultrasonicator. Then the engine performance and emission test were conducted on a four stroke engine fuelled with diesel using different combination of synthetic lubricant(SAE20W40) and formulated bio-lubricant and the result is compared with synthetic lubricant.The findings show that the partly replaced bio lubricant with synthetic lubricant reduces the emission of CO,HC and CO 2 ,when compared with synthetic lubricant. The brake thermal, mechanical efficiencies, brake power and specific fuel consumption is superior for biolubricant/ synthetic lubricant combination than synthetic lubricant.