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oldcorollas Forums Junkie Location: Kita-Ku, Sapporo, Japan Registered: January 2003	Re: Turkish Grandprix Tue, 23 August 2005 06:15 st184 sillycar wrote on Tue, 23 August 2005 14:49 Roundy wrote on Tue, 23 August 2005 08:54 umm unless the rules have changed a bit for next yr they don't have 'cams' it is all pneumatic i believe, therefore the valves open and close for the exact duration and lift to make the most power at that RPM range...tho i am amazed that they can open and shut a valve 12000 times per minute, that is just HUGE The explaination, as I understand it: They have Camshafts, with small pneumatic cylinders acting as Valve-springs. The main purpose of running these is to avoid the high-RPM harmonics which send conventional Valve-springs into uncontrollable ValveBounce above 14,000RPM (or thereabouts). I THINK the 4-stroke, 4Cylinder 250cc bikes get away with 19,000RPM because they have tiny cylinders, and hence tiny valves, which are relatively easy to control. Hell - make a V12 to the same specs and you've still only got a 750cc motor ! ! ! yup, the wire springs have a) too much inertia, and b) get hot VERY VERY quickly... http://scarbsf1.com/valves.html http://www.f1technical.net/article4.html although Renault have developed a camless system, i don't thnk it has made it to a race yet.. hmm nope.. here's the current engine ABOUT THE CBR205RR yar the valves only move a few mm and are tiny as well... the pistons also move buggerall.. maybe 40mm? [Updated on: Tue, 23 August 2005 07:18] [Report message to a moderator]

	Subject	Poster	Date
	Turkish Grandprix	Corona RT142	Mon, 22 August 2005 04:33
	Re: Turkish Grandprix	oldcorollas	Mon, 22 August 2005 04:58
	Re: Turkish Grandprix	st184 sillycar	Mon, 22 August 2005 05:36
	Re: Turkish Grandprix	Nark	Mon, 22 August 2005 05:05
	Re: Turkish Grandprix	oldcorollas	Mon, 22 August 2005 05:06
	Re: Turkish Grandprix	79rollaboy	Mon, 22 August 2005 05:10
	Re: Turkish Grandprix	Nark	Mon, 22 August 2005 05:14
	Re: Turkish Grandprix	79rollaboy	Mon, 22 August 2005 05:37
	Re: Turkish Grandprix	matt86sx	Mon, 22 August 2005 05:53
	Re: Turkish Grandprix	EVOSTi	Mon, 22 August 2005 07:03
	Re: Turkish Grandprix	st184 sillycar	Tue, 23 August 2005 05:00
	Re: Turkish Grandprix	Corona RT142	Mon, 22 August 2005 07:14
	Re: Turkish Grandprix	BlackGT4	Mon, 22 August 2005 07:28
	Re: Turkish Grandprix	Corona RT142	Mon, 22 August 2005 07:29
	Re: Turkish Grandprix	BlackGT4	Mon, 22 August 2005 08:14
	Re: Turkish Grandprix	Corona RT142	Mon, 22 August 2005 08:24
	Re: Turkish Grandprix	oldcorollas	Mon, 22 August 2005 08:46
	Re: Turkish Grandprix	Shraka	Mon, 22 August 2005 08:38
	Re: Turkish Grandprix	xolent	Mon, 22 August 2005 13:00
	Re: Turkish Grandprix	Roundy	Mon, 22 August 2005 22:54
	Re: Turkish Grandprix	st184 sillycar	Tue, 23 August 2005 04:49
	Re: Turkish Grandprix	oldcorollas	Tue, 23 August 2005 06:15
	Re: Turkish Grandprix	Corona RT142	Mon, 22 August 2005 23:16
	Re: Turkish Grandprix	river	Tue, 23 August 2005 03:06
	Re: Turkish Grandprix	Roundy	Tue, 23 August 2005 03:14
	Re: Turkish Grandprix	cannonball	Tue, 23 August 2005 05:22
	Re: Turkish Grandprix	Corona RT142	Tue, 23 August 2005 06:25
	Re: Turkish Grandprix	matt86sx	Wed, 24 August 2005 00:02
	Re: Turkish Grandprix	Roundy	Wed, 24 August 2005 00:13
	Re: Turkish Grandprix	st184 sillycar	Wed, 24 August 2005 01:28
	Re: Turkish Grandprix	Corona RT142	Wed, 24 August 2005 00:24
	Re: Turkish Grandprix	Corona RT142	Wed, 24 August 2005 01:33
	Re: Turkish Grandprix	st184 sillycar	Wed, 24 August 2005 01:44
	Re: Turkish Grandprix	Corona RT142	Wed, 24 August 2005 01:49
	Re: Turkish Grandprix	EVOSTi	Wed, 24 August 2005 04:31
	Re: Turkish Grandprix	Corona RT142	Wed, 24 August 2005 04:38
	Re: Turkish Grandprix	cannonball	Wed, 24 August 2005 05:20
	Re: Turkish Grandprix	Corona RT142	Wed, 24 August 2005 05:22
	Re: Turkish Grandprix	Ben Wilson	Thu, 25 August 2005 01:59

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