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question:
>I have a Volvo 240 with the b23 engine. Disp = 140 cu in. At 750 rpm idle the manifold >vacuum is 20 in hg = 9.8 psi
when you say 20 in hg, do you mean "20 inches of vacuum in reference to ambient?"
If so, wouldn't the final pressure be more like 5 psi absolute, therebye doubling the horsepower number?????
1 horsepower is something like .1 gallons per hour, which is something like 10 percent fuel economy. I think.
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