The BMW R1100RS is a sport-touring motorcycle that was manufactured by BMW Motorrad between 1993 and 2001, and was the first BMW motorcycle to use the R259 " Oilhead " boxer engine.
6-562: The R259 1,085 cc flat-twin engine has a maximum output of 90 horsepower (67 kW). The engine was named "Oilhead" as it had air-cooled cylinders but oil-cooled heads . The BMW R1100RS used a frameless design, using the engine as a stressed member , an approach used by BMW for all subsequent oilheads (except the R1100S). Instead of having conventional telescopic forks , the R1100RS used BMW's own Telelever suspension which bolted directly to
12-438: Is a stub . You can help Misplaced Pages by expanding it . Air cooling Air cooling is a method of dissipating heat . It works by expanding the surface area or increasing the flow of air over the object to be cooled, or both. An example of the former is to add cooling fins to the surface of the object, either by making them integral or by attaching them tightly to the object's surface (to ensure efficient heat transfer). In
18-399: The case of the latter, it is done by using a fan blowing air into or onto the object one wants to cool. The addition of fins to a heat sink increases its total surface area, resulting in greater cooling effectiveness. There are two types of cooling pads that can be used for air cooling: one is the honeycomb design and another one is excelsior . In all cases, the air has to be cooler than
24-495: The engine. The Telelever design has a superficially similar appearance to telescopic forks, but braking forces are taken back horizontally, minimising "fork dive". A rear subframe supported the rider, passenger and luggage. Both fully-faired and half-faired variants were available. In 1993 the engine was adopted for the R1100GS . In 1999, a more powerful six-speed version of the R259 engine
30-479: The object or surface from which it is expected to remove heat. This is due to the second law of thermodynamics , which states that heat will only move spontaneously from a hot reservoir (the heat sink) to a cold reservoir (the air). When operating in an environment with lower air pressure like high altitude or airplane cabins, the cooling capacity has to be derated compared to that of sea level. A rule-of-thumb formula to note: 1 – (h/17500) = derating factor. Where h
36-559: Was fitted in the BMW R1100S . In 2013 BMW introduced liquid-cooling for their flat-twin motorcycle engines, but the company still fit oilhead boxer engines to roadsters such as the R nineT and the R1100R . The R1100RS was marketed in the United States from 1994, when it was chosen as Cycle World 's best standard motorcycle of 1994. This motorcycle, scooter or moped-related article
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