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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
norvin
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<blockquote data-quote="Monkeypants" data-source="post: 33161" data-attributes="member: 2708"><p>Right Roy.</p><p>One of the well known race tuners in the Commando world has put up a lot of info on the AccessNorton site. In doing countless experiments on donor heads he has produced some interesting data.</p><p>Hes been building Norton race engines for years and talked about some of his early attempts that sounded great on paper but did not turn out well. One problem with overly large intake ports was the loss of charge density as mentioned. In some cases this was so severe that the engine did not have sufficient mid range grunt to get thru to the higher rpm where the oversized ports and carbs might have worked. In other cases the engine got there eventually but lost so much in the midrange that it was not a competitive engine.</p><p></p><p>Most interesting was to see what the screens on open velocity stacks do to flow. The wire to wire intersections create little vortexes which impede flow drastically. On the other hand a decent sized K&N type air filter has little effect on flow and in some cases can even increase flow by smoothening things out.</p><p></p><p>Glen</p></blockquote><p></p>
[QUOTE="Monkeypants, post: 33161, member: 2708"] Right Roy. One of the well known race tuners in the Commando world has put up a lot of info on the AccessNorton site. In doing countless experiments on donor heads he has produced some interesting data. Hes been building Norton race engines for years and talked about some of his early attempts that sounded great on paper but did not turn out well. One problem with overly large intake ports was the loss of charge density as mentioned. In some cases this was so severe that the engine did not have sufficient mid range grunt to get thru to the higher rpm where the oversized ports and carbs might have worked. In other cases the engine got there eventually but lost so much in the midrange that it was not a competitive engine. Most interesting was to see what the screens on open velocity stacks do to flow. The wire to wire intersections create little vortexes which impede flow drastically. On the other hand a decent sized K&N type air filter has little effect on flow and in some cases can even increase flow by smoothening things out. Glen [/QUOTE]
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Forums: Public Access
Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
norvin
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