* Engine Design: Some engines have internal components (like connecting rods, pistons, or crankshaft) that aren't strong enough to handle the increased stress of forced induction. Adding a supercharger to an engine not designed for it risks catastrophic failure. Older, less robust designs are especially vulnerable.
* Engine Management System (EMS): The engine's computer needs to be able to adjust fuel delivery and ignition timing to account for the increased air intake. Older engines might lack the necessary sensors or computational power for proper supercharger integration. A custom tune is almost always required.
* Physical Space: There simply might not be enough room in the engine bay to fit a supercharger and all the associated plumbing (intercooler, piping, etc.).
* Cost-Effectiveness: The cost of a supercharger kit, installation, professional tuning, and potentially required reinforcement modifications can far exceed the value of the vehicle, making it a financially unwise upgrade for some cars.
In short, while many modern engines are designed with forced induction in mind (or can be adapted), it's not a universal modification. Careful consideration of the engine's design, capabilities, and the overall cost is essential before attempting to supercharge any vehicle.
