Effect of Ethanol Content on Thermal Efficiency of a Spark-Ignition Light-Duty Engine

Table 4

Spark advance, manifold absolute pressure, and throttle position for all the tested fuels.

	Gasoline			E10			E20			E30			E85
	SA	MAP	TP	SA	MAP	TP	SA	MAP	T.P.	SA	MAP	T.P.	SA	MAP	T.P.
	[CAD]	[mbar]	°	[CAD]	[mbar]	°	[CAD]	[mbar]	°	[CAD]	[mbar]	°	[CAD]	[mbar]	°
1750 and 20	37.6	414	7	37.8	412	7	37.2	405	7	36.9	393	7	35.1	422	6
1750 and 50	30.5	605	11	31.1	595	11	30.6	592	11	30.5	585	11	29.5	607	10
1750 and 80	27.7	791	15	27.8	783	15	27.6	776	15	27.4	782	16	25.8	791	15
2050 and 20	41.5	384	8	44.2	375	7	41.8	381	8	42.2	375	9	40.5	386	7
2050 and 50	31.1	565	12	35.0	571	12	34.1	568	12	34.4	558	13	33.0	569	11
2050 and 80	29.6	751	16	32.1	738	16	31.5	740	16	31.9	733	17	29.9	748	16
3000 and 20	41.7	405	9	41.8	404	9	41.7	408	9	41.5	419	11	37.8	405	8
3000 and 50	34.3	578	15	34.4	575	14	35.6	559	14	34.1	595	16	33.5	570	14
3000 and 80	29.0	756	20	32.1	751	19	32.0	748	20	31.6	775	21	29.1	754	19
Mean value	33.7	583	12	35.1	578	12	34.7	575	12	34.5	579	13	32.7	584	12