This article presents the test result of four stroke, single cylinder, direct injection, water cooled diesel engine operating on linseed oil and diesel blend. The use of vegetable oil as a fuel in diesel engine cause some problem due to their high viscosity compared with conventional diesel fuel. Various techniques and methods are used to solve the problems resulting from high viscosity. One of these techniques is fuel blending. Non edible Vegetable oil like linseed oil is blended with diesel in various proportions like 10%, 20%, 30% and 40%, and find optimum blend which gives improved engine performance and emission characteristics. From experiment it is observed that brake thermal efficiency of L30D70 optimum compare to other blend. Also fuel consumption increased with increase in blend proportion. Also, CO emission decreased by increased in blend concentration and HC and NOx emission increased by increased in blend proportion. The blend of L30D70 could be useful without more affecting the engine performance.