g/s to cfm

[CSH-HQ]

Faulty memory can come from a over full mind.  Headlines on yesterdays 
Madison, WI Newspaper.  Honest.
Bruce


>>
>>>
>>>Yea I do that alot. One reason to find VE would be:  to convert to a
>>>MAP cal, I need to know it going in right?
>>>
>>>> Like trying to develope fuel tables on a computer, without even having the
>>>> engine running.  Ni being smart here just curious where ya going.
>>>> Also, need BMFC for figuging fuel needed.
>>>
>>>Okay I'll bite.. BMF-what?
>>
>>Brake Mean Fuel Consumption.  How many pounds of fuel to make one HP.
>
>Pounds of fuel used to make 1 Horsepower _for _one_ hour-- pounds of fuel
>per horsepower hour is the unit of BSFC.
>
>Horsepower is a unit measuring the RATE of doing work, a Horsepower-hour is
>a unit of work. (1 Hp-hr. = 1,980,000 foot lbs. =  2546 BTU).
>
>BSFC is a measure of an engine's efficiency. Say your BSFC is .40 lbs. of
>fuel/ Hp-hr.
>Say you are burning straight iso-octane, whose lower heat of combustion is
>18065 BTU/ lb.
>
>18065 BTU/lb. x .4 lb./ Hp-hr. =  7226 BTU heating value (of .4 lb. of
>fuel) to produce 1 Hp-hour (2546 BTU) of work.
>
>So--the thermal efficiency of your engine is = 2546/7226 =  35.2%
>
>>Typically .35 (really good), .5 average, .6+(tirbo+other applications where
>>fuel used to cool things.
>>Bruce
>>
>>  the BMF part I think I'm guessing wrong
>
>It's (properly known as Brake Specific Fuel Consumption--BS--F--C.
>
>
>Regards, Greg
>
>