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Old 07-04-2011, 06:58 AM   #192 (permalink)
Piwoslaw
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Join Date: Oct 2008
Location: Warsaw, Poland
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Svietlana II - '13 Peugeot 308SW e-HDI 6sp
90 day: 58.1 mpg (US)
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1.9 TDI ALH 90hp:

From:
Zużycie paliwa - odwieczny temat sporów. (click here for Google translation)

That blog has some really nice info, in fact it's probably the most comprehensive source of automotive info I've seen on the Polish Web recently. It gives a link to a German book with a few charts (Ottomotoren mit Direkteinspritzung: Verfahren, Systeme, Entwicklung, Potenzial, pp. 198-201), which are OK except that they don't have power curves.
Quote:
However, those charts do not have the power curves. They can be drawn using other values, the mean useful pressure and speed.
For engine power based on useful medium pressure, we use the formula *:
N = V * p * n/120
N - Power
V - engine displacement
p - the average usable pressure (bmep)
n - rotational speed

For example, 12 bar at 2000 r / min for the 1.9 TDI.
We must replace those units with SI:
1.9 l = 1.9 * 10 ^ (-3) m ^ 3
12 bar = 12 * 10 ^ 5 Pa

1.9 * 10 ^ (-3) [m ^ 3] * 12 * 10 ^ 5 [Pa] * 2000 [r / min] / 120 = 38 000 [W] = 38 [kW] / 0.7355 [hp / kW] = 51 [HP]

* For two-cycle engine: N = V * p * n/60
One of the comments also links to four charts:
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Piwoslaw's Peugeot 307sw modding thread

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