Intercooler - Explained

What is an Intercooler?

Introduction to Intercoolers

• The video introduces the concept of intercoolers, specifically focusing on a bar and plate style air-to-air intercooler from Yanaka Motorsports.

• The primary purpose of an intercooler is to reduce the intake air charge temperature in turbocharged or supercharged engines.

Importance of Cooler Air

• Cooler air carries more oxygen, allowing for better fuel combustion and increased power output.

• Hot compressed air can lead to premature combustion; thus, cooling it before it enters the engine is crucial.

Types of Intercoolers: Air-to-Air vs. Air-to-Water

Air-to-Air Intercooling System

• An air-to-air intercooler uses ambient air to cool the intake charge after compression by a turbocharger or supercharger.

• The setup involves hot compressed air passing through the intercooler where it cools down before entering the engine.

Air-to-Water Intercooling System

• In contrast, an air-to-water system utilizes water to cool the intake charge, which flows through channels in the intercooler.

• This system can be enhanced by using ice water for applications like drag racing where short bursts of high performance are needed.

Pros and Cons of Different Intercooling Systems

Advantages and Disadvantages

• Air-to-air systems are generally lighter, less complex, and cheaper compared to air-to-water systems.

• However, air-to-water systems can be more effective with reduced pressure loss due to shorter intake paths.

Bar and Plate vs. Tube and Fin Design

Construction Differences

• Bar and plate design consists of stacked plates that provide strength and better cooling capabilities under higher boost levels.

• Tube and fin designs are typically lighter, less expensive due to manufacturing processes but may have higher pressure drops compared to bar and plate designs.

Intercooler Design Considerations

Airflow and Cooling Efficiency

• The design of intercoolers impacts airflow; for instance, a radiator behind the intercooler can enhance air flow but may not provide optimal cooling compared to bar and plate designs.

• Increasing fin density in intercoolers improves cooling efficiency but also leads to a higher pressure drop across the unit, potentially reducing overall airflow.

• A highly restrictive intercooler can limit boost levels from a turbocharger, emphasizing the balance between high boost and adequate airflow post-intercooling.

Height and Temperature Differential

• Adjusting the height of an intercooler can enhance cooling effectiveness; however, increasing length beyond a certain point yields diminishing returns due to smaller temperature differentials between ambient and compressed air.

• Taller intercoolers maximize cooling by effectively clashing hot compressed air with cooler ambient air, yet practical size limitations must be considered for vehicle applications.

Thickness vs. Airflow Trade-offs

• While increasing thickness allows for more air passage through an intercooler, it can lead to decreased airflow and greater pressure loss, which negatively affects radiator cooling performance.