Performance Evaluation of a Low-Grade Low-Heat-Rejection Diesel Engine with Crude Pongamia oil

Table 2

The variation of peak BTE with injection timing and injection pressure in the conventional and LHR engines at different operating conditions of the vegetable oil.

		Peak BTE (%)
Injection timing (°bTDC)	Test fuel	Conventional engine						LHR engine
		Injection pressure (bars)						Injection pressure (bars)
		190		230		270		190		230		270
		NT	PT	NT	PT	NT	PT	NT	PT	NT	PT	NT	PT
27	DF	28	—	29	—	30	—	29	—	30	—	30.5	—
	CPO	25	26	26	27	27	28	28.5	29.5	29.5	30	30	30.5
29	DF	28.5	—	29.5	—	30.2		29.5	—	30.5	—	31	—
	CPO	27	27.5	27.5	28	28.5	29	29.5	30	30	30.5	30.5	31
30	DF	29	—	30	—	30.5	—	29	—	30	—	30.5	—
	CPO	26.5	27	28.5	29	28.5	29	29	29.5	29.5	30	30	30.5
31	DF	29.5	—	30	—	31	—	—	—	—	—	—	—
	CPO	28.5	29	28	28.5	27.5	28	—	—	—	—	—	—
32	DF	30		30.5		30.5
	CPO	27	28	27.5	28	28	28.5	—	—	—	—	—	—
33	DF	31		31		30	—	—	—	—	—	—	—

DF: diesel fuel, CPO: crude pongamia oil, NT: normal or room temperature, PT: preheat temperature.