PLAN equation to figure the viggens power - The Saab Link Forums

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Old 01-19-2008, 04:22 PM   #1
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PLAN equation to figure the viggens power

ok so im trying to do my homework on how to figure out the stock power coming from the b235 engine,in my book it gives me a way to figure it by use the PLAN equation
P= is the brake mean effective pressure,or bmep easy way to imagine bmep is as an average pressure pushing down on the piston donw the bore.
L=length of stroke
A=area of bore area prusee works with
N=number of putts engine makes ina a minute,represents how fast engine is running and how many cylenders


step 1 take p and multiply by A and you have pressure time area
then multiply PA by L and ou have a number representing torgue outout of the cylender and then take the figure and multiply it by n(how fast th job is getting done)and oyur result is power
POWER=trque times rpm

my questons..do i multiply by the maximum rpm of the viggen?does p mean my compression?9.3:1?do i change the stroke and bore into inches instead of mm? in the end i should get near 240 correct? can someone help me on how to do this
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Old 01-19-2008, 04:28 PM   #2
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also its says a 3.569 inch 800 psi of pressure is subected to 8000 pounds..are they talking about boost pressure?compression? im lost aaahh
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Old 01-19-2008, 05:16 PM   #3
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I've never heard of that PLAN equation. It sounds overly simplistic though. P or average pressure would be extremlly hard to find. This is the force that is exerted on the piston upon ignition of the fuel. The problem is that is changing as the piston moves, and also how do you determine the amount of fuel burnt, and whether or not it is burnt stoic or not?

The pressure times area thing works on a hydraulic or pneumatic cylinder since the pressure is constant as the piston strokes.

As a piston strokes, it doesen't add power, it does more work. But the power output of a piston does not change a the piston strokes.

Make sense?


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