Rotační motor v motocyklech: Komplexní průvodce

The rotary engine, also known as the Wankel engine, is a unique type of internal combustion engine that uses a rotor instead of pistons to convert linear motion into rotational motion. While rotary engines have been used in some cars, there are no production motorcycles that use rotary engines due to a number of challenges, including poor fuel efficiency, high emissions, and limited durability.

Výhody rotačních motorů

Rotary engines have several advantages over traditional piston engines:

  1. Hladší provoz: The rotary engine’s design allows for a more balanced and smoother operation, resulting in less vibration and a more refined riding experience.
  2. Méně pohyblivých dílů: Rotary engines have fewer moving parts compared to piston engines, which can lead to a simpler and more compact design.
  3. Nižší hmotnost: The rotary engine’s design allows for a lighter overall engine weight, which can be beneficial for motorcycle applications where weight is a critical factor.

Nevýhody rotačních motorů

rotary engine in motorcycles

Despite these advantages, rotary engines also have several significant drawbacks that have prevented their widespread adoption in the motorcycle industry:

  1. Špatná palivová účinnost: Rotary engines tend to have lower fuel efficiency compared to piston engines, which can result in higher fuel consumption and shorter range for motorcycles.
  2. Vysoké emise: Rotary engines typically produce higher levels of hydrocarbon and nitrogen oxide emissions, which can contribute to air pollution and environmental concerns.
  3. Omezená životnost: Rotary engines have a shorter lifespan compared to piston engines due to the wear and tear on the rotor and housing components.
  4. Vyšší náklady na údržbu: The specialized design and components of rotary engines can make them more expensive to maintain and repair over time.
  5. Chladicí výzvy: Rotary engines tend to operate at higher temperatures, which can lead to issues with engine cooling and thermal management.

Rotary Engine Motorcycle Prototypes

Despite the challenges, there have been some experiments and prototypes of motorcycles with rotary engines. One notable example is the Suzuki RE-5, which was developed in the 1970s and featured a 497cc rotary engine that produced 47 horsepower.

The RE-5 was not a commercial success, however, due to its poor fuel efficiency and high emissions. Other rotary engine motorcycle prototypes have been developed over the years, but they have faced similar challenges and have not been able to overcome the inherent limitations of the rotary engine design.

Customization and DIY Modifications

Due to the rarity and specialized nature of rotary engine motorcycles, there are limited resources available for DIY modifications or customization. However, there are some enthusiast communities, such as the Suzuki RE-5 Owners Club, where owners and enthusiasts share information and advice on maintaining and modifying these unique machines.

It’s important to note that any modifications or customization of a rotary engine motorcycle should be undertaken with caution and with a thorough understanding of the engine’s design and maintenance requirements. Improper modifications or maintenance can lead to further issues with durability, emissions, and overall performance.

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While rotary engines have some unique advantages, such as smoother operation and lighter weight, the significant challenges they face in terms of fuel efficiency, emissions, and durability have prevented their widespread adoption in the motorcycle industry. Despite some experimental prototypes, there are no production motorcycles that use rotary engines, and they remain a niche and specialized option for enthusiasts.

For most motorcycle riders, traditional piston engines continue to be the more practical and reliable choice, offering better fuel efficiency, lower emissions, and longer-lasting durability. However, the rotary engine’s unique design and characteristics continue to fascinate engineers and enthusiasts, and it’s possible that future advancements in technology could lead to a resurgence of rotary engine motorcycles in the years to come.


  1. Federal Register, “Light-Duty Vehicle Greenhouse Gas Emission Standards and Corporate Average Fuel Economy Standards; Final Rule,” May 7, 2010,
  2. Suzuki RE-5 Owners Club,
  3. Environmental Protection Agency, “Guide to Calculating Environmental Benefits from EPA Enforcement Actions,” March 2022,