BMW R1100S: Difference between revisions

The engine is a [[flat-twin engine|flat-twin]] [[History of BMW motorcycles#Oilheads|"oilhead"]] that has [[air cooling|air-cooled]] cylinders but [[oil cooling|oil-cooled heads]]. Derived from the [[BMW R1100RS]], the 1,085&nbsp;cc [[Fuel injection|fuel-injected]] [[Multi-valve|eight-valve]] engine is tuned for a maximum output of {{convert|98|hp|kW|}} at 8,400rpm.<ref name="Motorcycle20Oct98"/><ref name="bmbikes.co.uk"/> At the time of its introduction, it was BMW's most powerful boxer engine ever made, and the first mated to a six-speed transmission.<ref>{{citation|title=2007 BMW R1200S Road Test |journal=Rider |date=January 26, 2007 |url=http://www.ridermagazine.com/road-tests/2007-bmw-r1200s-road-test.htm/ |deadurlurl-status=yes dead|archiveurl=https://web.archive.org/web/20141230223146/http://www.ridermagazine.com/road-tests/2007-bmw-r1200s-road-test.htm/ |archivedate=2014-12-30 |df= }}</ref> The [[Overhead valve#Developments|ohv]] engine has chain-driven camshafts mounted in the cylinder heads, operating the valves ''via'' short pushrods and rocker arms. Engines produced after 2003 had [[dual ignition]], with two spark plugs per cylinder.<ref>Haynes Manual - "BMW 850,1100 & 1150 4-valve twins" page 0.8</ref> The compact close-ratio six-speed transmission is derived from the BMW K1200RS.<ref name="Motorcycle20Oct98"/> Far from being a touring overdrive, the top gear gives 20&nbsp;mph per 1,000rpm, so at 80&nbsp;mph the engine turns at 4,000rpm.

In addition to using the engine as a [[Motorcycle frame#Stressed member|stressed member]], the R1100S has a composite aluminum frame to which the suspension components are attached. The front suspension is BMW's [[patent]]ed [[History of BMW motorcycles#Telelever fork|Telelever]], with long [[telescopic fork|telescopic fork sliders]] containing neither springs nor damping. In order to minimize [[Suspension (motorcycle)#Brake dive|"fork dive"]], braking forces are taken back to the frame ''via'' a pivoting wishbone. A [[monoshock]] on this wishbone copes with springing and damping.<ref>{{cite web|url=http://www.dinamoto.it/dinamoto/8_on-line_papers/Telelever%20or%20forks/Telelever_eng.html|title=BMW Telelever and telescopic forks: which is better?|publisher=dinamoto.it|accessdate=29 December 2014|archive-url=https://web.archive.org/web/20100516043608/http://www.dinamoto.it/dinamoto/8_on-line_papers/Telelever%20or%20forks/Telelever.html|archive-date=16 May 2010|dead-url-status=yesdead}}</ref><ref>{{cite web|url=http://www.motorbikestoday.com/features/Articles/bmw_telelever.htm|title=BMW Telelever Explained|publisher=Motorbikes Today|accessdate=29 December 2014}}</ref> The rear suspension comprises BMW's "[[History of BMW motorcycles#Paralever|Paralever]]", a [[Swingarm#single-sided swingarm|single-sided swinging arm]] encompassing [[shaft drive#Motorcycle drive shafts|shaft drive]].<ref name="motorbikestoday">{{cite web|url=http://www.motorbikestoday.com/reviews/Articles/bmw_r1100s_03.htm|title=BMW R1100S Road test|publisher=motorbikestoday.com|accessdate=21 December 2014}}</ref> The Paralever mounts directly to the frame instead of to the gearbox as on earlier oilheads. A reviewer reported: “The result is greater frame rigidity and better handling".<ref name="Motorcycle20Oct98"/>

The R1100S was superseded in 2006 by the [[BMW R1200S|'''R1200S''']]. The alloy frame of the R1100S was replaced by a lightweight tubular trellis and so, with a tuned engine, the R1200S was {{convert|13|kg|abbr=on}} lighter and 25% more powerful. ''MCN'' compared the R1200S to its predecessor this way: "As an oddball track motorcycle it works, but as an accomplished all-rounder it falls short of the standards set by the R1100S that preceded it."<ref name=MCN2006>[http://www.motorcyclenews.com/bike-reviews/bmw/r1200s/2006/ BMW R1200S (2006-2007) Review], motorcyclenews.com, dated 23 November 2006, retrieved 1 December 2014</ref>