Vehicle Performance
Vehicle performance is the study of the motion of a vehicle. The motion of any vehicle depends upon all the forces and moments that act upon it. These forces and…
How to Determine Gear Ratio
In mechanical engineering, a gear ratio is a direct measure of the ratio of the rotational speeds of two or more interlocking gears. As a general rule, when dealing with…
Classical Design of Gear Train
In order to find the required overall gear ratio, the compound gear train contains two pairs of gears, d-a and b-f (Figure 1). The desired gear ratio, itot, between the input and output gears is…
Gear Ratios
Gear ratios are a core science behind almost every machine in the modern era. They can maximize power and efficiency and are based on simple mathematics. So, how do they…
Piston motion equations
The motion of a non-offset piston connected to a crank through a connecting rod (as would be found in internal combustion engines), can be expressed through several mathematical equations. This article shows how these motion equations are derived,…
OVERSQUARE VS UNDERSQUARE
A closely related topic to rod ratio is that of bore and stroke. If the bore and stroke dimensions in an engine are the same (say a 4.00 inch bore…
BEST ROD RATIO?
Essentially, there is no “best” rod ratio for any given engine. Some say to use the longest rods that will fit the engine to make the most mid-range and peak…
What is Bore-Stroke Ratio?
Bore-Stroke Ratio is the ratio between the dimensions of the engine cylinder bore diameter to its piston stroke-length. The cylinder bore diameter divided by the stroke-length gives the Bore-to-Stroke ratio.…
How Engine Capacity affects its performance
The engine's capacity plays an important role in determining various engine outputs such as engine power, torque, and mileage. It is the volume, or in other words, the space available inside the cylinder…
