There are several reasons why car manufacturers generally don't use 1000cc (1.0L) engines similar to those used in motorcycles, despite the potential for high horsepower and torque. Here are some key considerations:
Power delivery and drivability: Motorcycle engines are designed for different purposes and operating conditions compared to car engines. Motorcycle engines often deliver their power at higher RPMs and require frequent shifting of gears to keep the engine in its powerband. In contrast, car engines are typically optimized for a broader range of RPMs and prioritize smooth power delivery across a wider speed range, providing better drivability and versatility in various driving conditions.
Noise and vibration: Motorcycle engines tend to be louder and vibrate more compared to car engines. This is partly due to the engine's design and the absence of extensive sound insulation and damping mechanisms found in cars. For passenger cars, manufacturers aim to provide a quieter and more refined driving experience, so they often prioritize engines that produce less noise and vibration.
Emissions and fuel efficiency: Car engines are subject to strict emissions regulations and fuel efficiency standards. Smaller displacement engines used in motorcycles might have difficulty meeting these stringent requirements without additional technologies, such as advanced fuel injection systems, catalytic converters, and exhaust treatment systems. Car manufacturers typically focus on optimizing engines to meet emission standards and achieve better fuel efficiency across a wider range of driving conditions.
Safety and durability: Cars generally require more power and torque to move their heavier weight compared to motorcycles. Larger displacement engines provide the necessary low-end torque for smooth acceleration and better performance at lower speeds. While 1000cc motorcycle engines can produce impressive power, they might not provide the same level of low-end torque required for heavier cars, particularly when carrying passengers or cargo. Car manufacturers aim to ensure safety, reliability, and longevity of their engines, considering various load conditions and durability requirements.
While motorcycle engines can offer high power-to-weight ratios and impressive performance, car manufacturers consider a range of factors beyond just horsepower and torque when designing engines for passenger cars. They prioritize factors such as drivability, comfort, emissions, fuel efficiency, safety, and overall customer experience to meet the specific requirements and expectations of car owners.