Modifying the cylinder head is a popular but technically demanding way to increase engine performance. So in this article, we will look at the possible modifications of the cylinder head and its accessories.

This article is only informative about potential adjustments to the cylinder head and its accessories and does not serve as a guide.

Replacing the stock exhaust pipes with tuned exhaust pipes is one of the basic and widespread engine modifications. But what do you achieve with such a modification, and what is the difference between regular leads and tuned leads?

We will dive into the topic soon, but first, let's say a few words about what the exhaust manifolds are actually used for.

An air-fuel ratio is a dimensionless number that expresses the ratio between the actual amount of air in the mixture and the theoretical amount (stoichiometric amount) of air corresponding to the fuel used. The coefficient, named in English as the Air-Fuel Ratio, is denoted by the Greek letter λ (lambda).

The coefficient defined in this way is mainly used in the field of internal combustion engines because it is a necessary parameter for the preparation of the mixture. The air-fuel ratio thus thoroughly expresses the mixture's richness level. Each fuel needs a different amount of air for its perfect combustion.

RPM fluctuations are not one of those things you can just wave your hand at and start dealing with only when the worst happens. There can be several different causes if your engine's speed fluctuates. Without a thorough inspection of the car and its condition, it is tough to determine the problem.

We have already covered the topic of RPM fluctuations in the past. However, this article will look at one of the specific causes of engine power fluctuations, the name of which you will surely know - a faulty lambda sensor.

A Wankel engine, sometimes called a rotary engine, is a type of internal combustion engine with a rotary piston that converts pressure into rotary motion. This type of engine brings many advantages.

Unlike a classic combustion engine, all parts of the Wankel engine rotate in one direction.

Power and torque are the basic technical parameters of an internal combustion engine. Not only does the maximum speed and acceleration of the car depend on these parameters, but also fuel consumption or the ability to climb hills and the like.

Engine power can be expressed in kilowatts (kW), but the horsepower (HP or metric horsepower) is usually preferred. The unit of torque, colloquially torque, is either pound-foot (lb-ft) or Newton-metre (Nm).