INVESTIGATIONS ON THE PERFORMANCE AND EXHAUST EMISSIONS OF A DIESEL: PREHEATING

The preheating was aimed to bring down the viscosity to improve the fuel injection pattern. The pumped fuel is preheated before injection and the temperature was monitored by a thermocouple and temperature indicator.
Fig1Investigations On The_decrypted
Figure :1 Effect of temperature on Viscosity

INJECTION TIMING

The engine was started easily without and difficulties however the effective methods of use of MI oil was injected into cylinder by retarding and advancing the injection timing by 30 CA. the injection advance was made by removing the shims already available in between the pump and engine block, but the addition of shims make the injection timing retard. Here the thicknesses of the shims available are 0.13m.m, o.25mm and 0.38mm.

For this experiment the advance/retard timing of 30 CA was done by removing /adding of 0.13 mm shim.

MADHUCA INDICA (MI OIL) WITH PREHEATING

The Madhuca Indica oil was used as neat fuel in diesel engine and produced thermal efficiency less than diesel therefore preheating was done before injection. The preheating is normally done by the heat from exhaust gases/ by heating the injection pipe with electrical heater and controlled by a dimmer stat and maintained the temperature at 1350 C. The test report for the oil find to temperature at which the viscosity of the Madhuca Indica oil is approximately equal to diesel and the preheating test was conducted only at that temperature. The performance diagram for advance and retard timing was discussed in this and since the advance injection timing gave better performance that alone was considered for further discussion in this.