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View Full Version : Just wanted to run some numbers this morning and see.



Akuma
12-16-05, 05:27 AM
In a standard piston engine (an Otto or Diesel engine), displacement is calculated by multiplying the number of cylinders in the engine with the area of a piston and the length of the stroke. With circular pistons, displacement can be calculated from the bore diameter and stroke using the following formula:

Pi/4 x Bore^2 x Stroke x the Number of Cylinders,

Using my engine, a 3.24 Bore and a 5.0 Stroke:

.7854 x 3.24^2 x 5.0 x 8= 329.79.

Then to get liters you take 329.79ci and multiply it by .0163871 and that comes out to 5.404 L.

So then if you really want to get crazy here is 1/4 mile ET and trap speed formulas. To get a "rough estimate" (this formula will be a little optimistic):

ET = {[ (weight of car) / (max hp) ]^1/3} x 5.825

To calculate the trap speed for the 1/4 mile, use this formula:

mph = [ (max hp) / (weigh of car) ] 1/3 x 234


And here is one more for shits and giggles.To calculate how much horsepower your car would have at a certain altitude, use this formula:

hp loss = [ (elevation in feet) / 1000 ] x 0.03 x (hp at sea level)

Oh yeah, and the maximum horsepower that manufacturers usually quote for their engines is at sea level.

50 BMG
12-16-05, 09:34 AM
OK...thanks for the textbook checkup.

Now what does this have to do with you?

bluepony
12-16-05, 10:52 AM
http://www.wallaceracing.com/Calculators.htm

Akuma
12-16-05, 03:47 PM
OK...thanks for the textbook checkup.

Now what does this have to do with you?

Nothing I just woke up at 5 and had nothing better to do. :roll:

Akuma
12-16-05, 03:50 PM
http://www.wallaceracing.com/Calculators.htm

Nice site!

50 BMG
12-16-05, 04:28 PM
Nothing I just woke up at 5 and had nothing better to do. :roll:

Mabey you should get your car done then...

Dan
12-17-05, 04:51 PM
Sounds like some one is having with draws being with out a fast car! lol