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Norton CS1
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<h2 id="development">Development</h2> <p>The Norton Camshaft Senior Model 1 (CS1) engine was designed by Walter Moore in 1927, based on the <a href="/facts/Norton_ES2/YSfEJvHB">Norton ES2</a> <a href="/facts/Pushrod_engine/zd4v8vWf">pushrod engine</a> and re-using many parts. The frame was a new full cradle design and with a <a href="/facts/Close-ratio/zh9FIDGn">close-ratio</a> <a href="/facts/Kick_start/d1wRB3a5">kickstart</a>-less gearbox, 8-inch brakes, <a href="/facts/Amal_TT/Kv1skryM">Amal TT</a> carburettor, Lucas Racing <a href="/facts/Ignition_magneto/9Xpwl27E">magneto</a> and a 3-gallon petrol tank. The CS1 was the standard for racing Nortons for the next 20 years.<a class="footnote-ref" id="fnref:2" href="#fn:2"><sup>2</sup></a> The magneto was moved to the rear of the engine and the bottom end was a traditional Norton design, but in the side of the crankcase was the oil pump housing and a pair of <a href="/facts/Bevel_gear/ScGDnhC2">bevel gears</a> to drive the long shaft which ran in a tube up the side of the engine to a second pair of gears driving the <a href="/facts/Overhead_camshaft/z2D9nIL5">overhead camshaft</a>.<a class="footnote-ref" id="fnref:3" href="#fn:3"><sup>3</sup></a> </p> <h2 id="racing-success">Racing success</h2> <p><a href="/facts/Alec_Bennett/mETcuWdC">Alec Bennett</a> riding the CS1 on its first race won the <a href="/facts/Isle_of_Man_TT/cI7ybh4H">Isle of Man Senior TT</a> in 1927 and <a href="/facts/Stanley_Woods/wlKfVhwP">Stanley Woods</a> set the fastest lap at 70.99 mph before retiring.<a class="footnote-ref" id="fnref:4" href="#fn:4"><sup>4</sup></a> </p><p>Unknown rider Tim Hunt won the Amateur TT in following year on a Norton CS1, setting a new TT record. He later used the same motorcycle to win the gold medal in the <a href="/facts/Scottish_Six_Days_Trial/hMCEex60">Scottish Six Days Trial</a>.<a class="footnote-ref" id="fnref:5" href="#fn:5"><sup>5</sup></a> </p><p>In 1928 a <i>Junior</i> version of the CS1 with a 348cc engine and designated the Norton CJ was entered for the <a href="/facts/Isle_of_Man_TT/cI7ybh4H">Isle of Man TT</a>. The <a href="/facts/Bore_(engine)/HQjzTl2Y">bore</a> and <a href="/facts/Stroke_(engine)/whnTkDl3">stroke</a> of this engine was 71 x 88 mm and it looked promising but 1928 proved to be an unlucky year for Norton, as there were technical problems with Walter Moore's redesigned cambox and only one major race was won that year. 1929 also went badly with reliability problems and only one win in the <a href="/facts/Spanish_Grand_Prix/BcnqsJl3">Spanish GP</a> of 1929.<a class="footnote-ref" id="fnref:6" href="#fn:6"><sup>6</sup></a> </p><p>In March 1931 on <a href="/facts/Pendine_Sands/uM5DmMw9">Pendine Sands</a> Joe Craig and Tim Hunt achieved a best speed on the CS1 of 118 mph.<a class="footnote-ref" id="fnref:7" href="#fn:7"><sup>7</sup></a> Also in 1931 the Norton CS1 took the first five places in Junior and Senior events, starting what was to prove Norton's most successful period, and until the end of the 1930s Norton dominated international events with wins in both classes throughout the decade.<a class="footnote-ref" id="fnref:8" href="#fn:8"><sup>8</sup></a> Tim Hunt became the first rider to win two TT races in one week, with success in the Junior TT Race in 3 h 34 min 21 s at an average speed of 73.4 mph and also the Senior TT Race in 3 h 23 min 28 s at an average speed of 77.90 mph.<a class="footnote-ref" id="fnref:9" href="#fn:9"><sup>9</sup></a> </p> <h2 id="see-also">See also</h2> <ul><li><a href="/facts/List_of_motorcycles_of_the_1920s/czSmFDC3">List of motorcycles of the 1920s</a></li></ul> <h2 id="external-links">External links</h2> <ul><li><a href="http://www.manxnorton.co.nz/gallery/">1929 Norton CS1 owned by Ken McIntosh</a></li> <li><a href="http://www.realclassic.co.uk/nort030212.html">Norton 1931 490cc Works Racer</a></li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>Kemp, Andrew; De Cet (2004). Classic British Bikes. Mirco. Bookmart Ltd. ISBN 978-1-86147-136-9. <a href="978-1-86147-136-9" target="_blank">978-1-86147-136-9</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>McIntosh, Ken (October 2008). "The Norton CS1". Retrieved 26 December 2008. <a href="http://southsiders-mc.blogspot.com/2008/10/norton-1927-cs1.html" target="_blank">http://southsiders-mc.blogspot.com/2008/10/norton-1927-cs1.html</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>Kemp, Andrew; De Cet (2004). Classic British Bikes. Mirco. Bookmart Ltd. ISBN 978-1-86147-136-9. <a href="978-1-86147-136-9" target="_blank">978-1-86147-136-9</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>"Norton SOHC History". Archived from the original on 28 August 2008. Retrieved 26 December 2008. <a href="https://web.archive.org/web/20080828055118/http://www.racingnorton.co.uk/Manx-Norton-11.html" target="_blank">https://web.archive.org/web/20080828055118/http://www.racingnorton.co.uk/Manx-Norton-11.html</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> <li id="fn:5"><p>McIntosh, Ken (October 2008). "The Norton CS1". Retrieved 26 December 2008. <a href="http://southsiders-mc.blogspot.com/2008/10/norton-1927-cs1.html" target="_blank">http://southsiders-mc.blogspot.com/2008/10/norton-1927-cs1.html</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></p></li> <li id="fn:6"><p>"Norton SOHC History". Archived from the original on 28 August 2008. Retrieved 26 December 2008. <a href="https://web.archive.org/web/20080828055118/http://www.racingnorton.co.uk/Manx-Norton-11.html" target="_blank">https://web.archive.org/web/20080828055118/http://www.racingnorton.co.uk/Manx-Norton-11.html</a> <a href="#fnref:6" class="footnote-back-ref">↩</a></p></li> <li id="fn:7"><p>"Norton SOHC History". Archived from the original on 28 August 2008. Retrieved 26 December 2008. <a href="https://web.archive.org/web/20080828055118/http://www.racingnorton.co.uk/Manx-Norton-11.html" target="_blank">https://web.archive.org/web/20080828055118/http://www.racingnorton.co.uk/Manx-Norton-11.html</a> <a href="#fnref:7" class="footnote-back-ref">↩</a></p></li> <li id="fn:8"><p>"Norton SOHC History". Archived from the original on 28 August 2008. Retrieved 26 December 2008. <a href="https://web.archive.org/web/20080828055118/http://www.racingnorton.co.uk/Manx-Norton-11.html" target="_blank">https://web.archive.org/web/20080828055118/http://www.racingnorton.co.uk/Manx-Norton-11.html</a> <a href="#fnref:8" class="footnote-back-ref">↩</a></p></li> <li id="fn:9"><p>"Tim (Percy) Hunt, TT Racer". Retrieved 26 December 2008. <a href="http://www.link4life.org/index.cfm?fuseaction=c.showPage&pageID=670" target="_blank">http://www.link4life.org/index.cfm?fuseaction=c.showPage&pageID=670</a> <a href="#fnref:9" class="footnote-back-ref">↩</a></p></li> </ol>