How Harley's Air-Cooled Twins Stay Cool(ish) in Summer Heat

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Harley-Davidson's air-cooled V-Twin remains a stubbornly anachronistic signature of the American motorcycle manufacturer, and its most potent expression comes in the form of the 110 cubic inch (1,803cc) Screamin' Eagle lump currently found in the CVO lineup. Producing 122 lb-ft of torque, this is the most powerful Harley engine to date; as such, an oil cooler can only go so in protecting this puppy from soaring temps.

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How does Harley keep this mill from melting when mercury hits triple digits? One feature engineered into air-cooled Harley engines is a function called Rear Cylinder Cutout. Because the aft cylinder tends to run warmer since it doesn't benefit from the airflow that hits the front cylinder, RCC seeks to equalize the difference by shutting off fuel and spark to the back cylinder if the engine idles for more than 3 seconds above 288? F. Once the air-only mix drops the combustion chamber?temperature to 275? F, normal operation resumes. RCC was introduced in 2008, and was actuated by a cable before the 2009 model year, when throttle-by-wire technology was?introduced.

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While automotive applications frequently implement cylinder deactivation for MPG improvements, we won't hold our breath for that functionality to be applied to bikes; after all, motorcyclists are usually more interested in staying cool than saving fuel.

Source: http://www.popularmechanics.com/cars/news/auto-blog/harley-davidson-rear-cylinder-cutout?src=rss

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