Having multiple rotors in a motorcycle engine, such as a rotary engine, can offer certain advantages and disadvantages compared to traditional single-rotor engines. Here are some considerations:
Advantages:
Compact Size: Multi-rotor engines can be more compact than their equivalent displacement single-rotor counterparts. The design allows for a higher power-to-weight ratio and a smaller physical footprint.
Smooth Power Delivery: The design of multi-rotor engines can provide smooth power delivery due to their continuous combustion process. This can result in reduced vibrations and potentially improved rider comfort.
High Revving Capability: Rotary engines tend to have high-revving characteristics, allowing them to achieve high RPMs more easily. This can lead to impressive power outputs, especially in relation to their displacement.
High Power-to-Weight Ratio: The compact size and high-revving nature of multi-rotor engines can contribute to an excellent power-to-weight ratio. They can generate significant power output relative to their overall weight, which can result in faster acceleration and higher top speeds.
Disadvantages:
Fuel Efficiency: Rotary engines, including multi-rotor designs, tend to be less fuel-efficient compared to traditional piston engines. They typically consume more fuel for a given power output due to their combustion process and design.
Lack of Low-End Torque: Rotary engines often lack low-end torque, which can make them less suitable for tasks that require strong low-speed pulling power, such as off-roading or towing.
Oil Consumption: Rotary engines have a reputation for consuming oil as part of their normal operation. This means that riders need to regularly monitor and top up the oil levels, which can be an inconvenience.
Complexity and Maintenance: Multi-rotor engines can be mechanically complex, with more moving parts and intricate designs. This complexity can result in higher maintenance requirements, potentially leading to increased costs and the need for specialized knowledge when servicing or repairing the engine.
It's worth noting that rotary engines, including those with multiple rotors, are relatively rare in the motorcycle industry. The majority of motorcycles use traditional piston engines due to their widespread availability, familiarity, and established reliability.