Generate an image of a motorcycle engine shaped like a human heart. The engine should have the general shape of a human heart, with combustion chambers and other mechanical parts arranged to resemble the cavities and structures of the human heart. The "aorta" of the engine should be the exhaust pipe, and the "valves" should resemble heart valves. Style it realistically, but with a touch of fantasy to highlight the connection between the machine and the human organ. Illuminate the engine with subdued light to highlight details and create an intriguing atmosphere. Use dark metallic tones for the engine with red details to emphasize its connection to the human heart. Texture the engine with a slightly shiny metallic surface and refined details to simulate the textures of cardiac muscle and veins. Add a subtle glow around the engine for a mystical appearance, suggesting its symbolic importance as the heart of the motorcycle. Draw inspiration from surrealist artworks that explore the fusion of machinery and human anatomy.