## What Engine is in NASCAR Cars?
The engines used in NASCAR Cup Series cars are custom-built V8 engines that are specifically designed for racing. These engines are based on production engine blocks, but they are extensively modified with aftermarket parts to increase horsepower and torque.
Engine Specifications
The NASCAR Cup Series engine specifications are as follows:
* **Type:** V8
* **Displacement:** 358 cubic inches (5.86 liters)
* **Bore:** 4.50 inches (114.3 mm)
* **Stroke:** 3.59 inches (91.2 mm)
* **Compression ratio:** 12.0:1
* **Valvetrain:** Overhead valve with two valves per cylinder
* **Fuel injection:** Electronic fuel injection
* **Ignition:** Electronic ignition
* **Power:** Approximately 900 horsepower
* **Torque:** Approximately 700 lb-ft
Engine Builders
The engines used in NASCAR Cup Series cars are built by a variety of engine builders, including:
* Hendrick Motorsports Engines
* Roush Yates Engines
* Stewart-Haas Racing Engines
* Toyota Racing Development
* Ford Performance
Engine Development
The engines used in NASCAR Cup Series cars are constantly being developed to improve performance. Engine builders are always looking for ways to increase horsepower and torque, while also improving reliability.
Recent engine development trends include:
* The use of lightweight materials, such as titanium and carbon fiber
* The use of advanced manufacturing techniques, such as 3D printing
* The use of new materials, such as graphene
Engine Tuning
The engines used in NASCAR Cup Series cars are tuned to specific tracks and conditions. Engine tuners work with drivers to find the best combination of horsepower and torque for each race.
Engine tuning involves adjusting a variety of factors, including:
* Fuel injection
* Ignition timing
* Cam timing
* Valve lift
Engine Maintenance
The engines used in NASCAR Cup Series cars are meticulously maintained. Engine crews perform regular maintenance checks, including:
* Changing oil and filters
* Inspecting spark plugs
* Checking valve clearances
* Adjusting timing belts
Engine Costs
The engines used in NASCAR Cup Series cars are very expensive. A single engine can cost upwards of $100,000. Engine costs are a major factor in the overall cost of racing in NASCAR.
Conclusion
The engines used in NASCAR Cup Series cars are purpose-built racing engines that are designed to provide maximum performance and reliability. These engines are constantly being developed to improve performance, and they are a major factor in the overall cost of racing in NASCAR.
