four ways in which you can increase engine power

I hope u guyz remember my second last post which was about the working of a 4-stroke engine.if u haven't read it then plz do so coz it will be a lot of help in understanding further articles.So in this article i'll straight away come to the point and tell u about how u can increase ur engine power!!

There are four ways in which you can increase engine power:

1. Increase the engine displacement by boring the motor out or stroking the crankshaft.
2. Increase the engine speed.
3. Improve the Volumetric Efficiency of the engine.
4. Increase the air density.

1) . Engine capacity or displacement is measured by the formula (^π/4 × bore²) × stroke × cylinders. The bore is the diameter of the cylinder; thus (^π/4 × bore²) gives us the area of the cylinder. The stroke is the distance the piston travels from TDC to BDC and gives us the length of the cylinder. Multiplying these two measurements gives us the volume of one cylinder. Multiplying the volume of each cylinder by the number of cylinders that engine has will give us the total displacement of the engine. Thus, by increasing the area, length, or number of cylinders, we can increase the displacement of the engine.

Unfortunately we can't increase the number of cylinders so we're left with the area and the length. We can increase the cylinder area by boring the motor. This is the easiest way of increasing displacement, but is restricted by the thickness of the cylinder walls, and the space between the cylinders. We can also increase the length by stroking the crankshaft. This is more complicated as it requires the offset machining of the big-end journals on the crankshaft and possibly on the conrods. If the big-end journals of the conrod cannot be ground, you must either find slightly longer conrods that will fit, or pistons with a shorter compression height, i.e., the distance between the center of the gudgeon pin and the piston top. Stroking is restricted by the clearance between the rotational diameter of the crankshaft and the engine block.

2). Increasing engine speed does not increase the power per cycle, but increases the rate at which power in produced as the number of cycles per time frame increase. In other words, power is being produced more often as the Otto cycle is being completed much quicker. Increasing engine speed above the red line of the stock engine generally requires a complete engine rebuild with forged pistons, stainless steel conrods, stainless steel crankshaft, and a more robust valve train.

3). Denser air produces more power because it has more air molecules per volume. There are two ways in which air density can be increased – by lowering the air temperature, or increasing air pressure. Unfortunately, we can't really lower the air temperature but we can increase air pressure. The easiest way to increase air pressure would be to drive at lower altitude but this isn't really practical. The other way is to use forced induction. The three forms of forced induction are:

• Installing a supercharger.
• Installing a turbocharger.
• Installing Nitrous injection.

i'll be takin that all later on so keep reading!