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Vacuum HP
I was driving home last night and noted that the absolute manifold pressure was between 7 and 9 psia, so I wondered how much horsepower that was. I Calculated it to be 36 HP! That's more than is needed to propel the car on level ground.
saturn sc1:
14.2-8 = 6.2 psi differential pressure
1905 liter displacement
4 stroke engine
2042 RPM at 65 mph
Pv = pressure * volume/ time
Pv = (6.2 * 4.448/.0254^3) * (1905/1000/4) * (2042/60) * 1.34/1000 = 36 hp
units:
Pv = (psi* N/lbf * m^3/in^3) * (L/m^3/intake strokes per revolution) * rpm/(min/s) = N *m/s
N*m/s /1000*1.34 = hp
6.2 psid
1.905 liter displacment
2042.14153122327 rpm
power, KW 27.2
HP vacuum 36.5
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- Tony
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