The Wankel engine faced several challenges that prevented it from prevailing in the automotive industry. One major issue was its high fuel consumption and emissions, which made it less appealing in an era of increasing environmental awareness and stricter regulations. Additionally, the engine's complex design and manufacturing process made it more expensive to produce and maintain compared to traditional piston engines. Furthermore, the Wankel engine struggled to overcome reliability and durability concerns, leading to a lack of confidence from consumers and automakers. These factors ultimately limited the widespread adoption and success of the Wankel engine in the automotive market. **

A Wankel engine can be considered an investment for individuals who are interested in collecting or restoring vintage or rare vehicles that are equipped with this type of engine. The Wankel engine, known for its unique rotary design, was used in a limited number of vehicles, making it a sought-after item for enthusiasts and collectors. However, as with any investment, the potential for appreciation in value depends on various factors such as the condition of the engine, the rarity of the vehicle it is installed in, and the overall demand for Wankel-powered vehicles in the collector market. **

The Wankel engine did not prevail for several reasons. One of the main reasons is that it had issues with sealing, which led to poor fuel efficiency and high oil consumption. Additionally, the Wankel engine had difficulty meeting emissions standards and had a reputation for high levels of pollution. Furthermore, the complexity of the engine design and the high cost of production also contributed to its lack of widespread adoption. Finally, the Wankel engine faced strong competition from traditional piston engines, which continued to improve in efficiency and performance. **

Wankel engines can be purchased from various sources, including online marketplaces, specialty automotive shops, and directly from manufacturers. There are also dedicated Wankel engine suppliers and rebuilders who offer a range of options for purchasing new or refurbished Wankel engines. Additionally, some automotive enthusiasts may find Wankel engines for sale through classified ads, forums, or auctions. It's important to do thorough research and ensure that the seller is reputable before making a purchase. **

The Wankel engine did not become established primarily due to a few key reasons. One of the main issues was the engine's high fuel consumption and poor emissions performance compared to traditional piston engines. Additionally, the complexity of the Wankel engine design made it more expensive to manufacture and maintain. The engine also faced challenges with durability and reliability, which hindered its widespread adoption in the automotive industry. **

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The Wankel engine consumes more fuel compared to traditional piston engines because of its design. The Wankel engine has a higher surface area-to-volume ratio, which leads to increased heat loss and reduced thermal efficiency. Additionally, the design of the Wankel engine results in incomplete combustion of fuel, leading to higher fuel consumption. Lastly, the sealing system in the Wankel engine is less efficient, causing fuel leakage and further contributing to its higher fuel consumption. **

Some Wankel engines have two spark plugs to ensure more complete combustion of the air-fuel mixture in the combustion chamber. The Wankel engine design can sometimes result in uneven fuel distribution and incomplete combustion, leading to lower efficiency and higher emissions. By having two spark plugs, the engine can ignite the air-fuel mixture from two different points, promoting more thorough combustion and improving overall engine performance. Additionally, the dual spark plugs can help to reduce the risk of engine knock and pre-ignition, which can be more common in rotary engines. **