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#1: Piston Motion and Speed:

Piston motion in the cylinder is a function of rod length as well as crankshaft angle (degrees). Zero degrees is top dead center (TDC) and 180 degrees is bottom dead center (BDC). Note that at 90 degrees, the piston is below the halfway point in the cylinder. This is seldom discussed...

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List of Tips

#1) Piston Motion and Speed
#2) HP from ET and weight
#3)

#2: HP from ET and weight:

These performance equations are estimates. They let you know what to expect if everything is matched fairly well. But if you don't have slicks and a well setup suspension, your 60 ft times will be slower, or if you have 3.25 gears when you should have 4.10, then your ET will be slower.

ET...Elapsed time for 1/4 mile, seconds
MPH..Trap speed at end of 1/4 mile, miles per hour
WT...Weight, pounds (includes driver, fuel, etc.)

ET = 5.825 * (WT/HP)^0.333
MPH = 234. * (HP/WT)^0.333
60 ft time = 0.17 + 0.12*ET (sea level, slicks, best gear, etc)

HP = WT*(MPH/234)^3
HP = WT/(ET/5.825)^3

ET(1/4 mile) = 1.58 * ET(1/8 mile)