# Vehical Engine Horsepower

Written by Jerry Ratzlaff on . Posted in Fluid Dynamics

## Vehical Engine Horsepower Formulas

$$\large{ EHP_v = W \left( \frac{ s }{ 234 } \right)^3 }$$

$$\large{ EHP_{vc} = W \; \left( \frac{ s_2 }{ 234 } \right)^3 - \left( \frac{ s_1 }{ 234 } \right)^3 }$$

Units English Metric
$$\large{ EHP_v }$$ = vertical engine horsepower $$\large{ \frac{lbf-ft}{sec} }$$ $$\large{ \frac{J}{s} }$$
$$\large{ EHP_{vc} }$$ = change in horsepower $$\large{ \frac{lbf-ft}{sec} }$$ $$\large{ \frac{J}{s} }$$
$$\large{ s }$$ = speed $$\large{ \frac{ft}{sec} }$$ $$\large{ \frac{m}{s} }$$
$$\large{ s_1 }$$ = initial speed $$\large{ \frac{ft}{sec} }$$ $$\large{ \frac{m}{s} }$$
$$\large{ s_2 }$$ = final speed $$\large{ \frac{ft}{sec} }$$ $$\large{ \frac{m}{s} }$$
$$\large{ W }$$ = vehical weight $$\large{lbf}$$ $$\large{N}$$