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Toymods » Tech & Conversions » Head flow and flame propegation issues in turbocharged cars Show: Today's Posts  :: Show Polls  Email to friend

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oldcorollas Forums Junkie Location: Kita-Ku, Sapporo, Japan Registered: January 2003	Re: Head flow and flame propegation issues in turbocharged cars Wed, 27 October 2004 02:44 it's all about the shape of the cavity at the time that ignition occurs.. take away piston and roof and just think about that remaining space... aivui, in the squish area the gases get a high rate of compression just as the piston reaches TDC, ie if squish clearance is 1mm, then in the last 2mm of piston movement, the squish area gets compressed 3:1... this results in these gases being at _higher_ pressure than the rest of the combustion chamber, and as a result, sort of spray out into the rest of the chamber, causing much mixing. This high rate of compression will also cause a large temperature rise in the gas, but since there is so little gas in contact with such a large surface area of piston and roof, this temp rise is dissipated quickly. have to remember that ignition occurred a while ago relative to the squish (sayy 20 deg BTDC), the the flame front is already propogating away from the spark plug. the 'squished gas' is squirted toward the flame front, and causes tumbling and turbulence and mixing of burning and unburnt gas... resulting in a much smoother burn... or have i got it arse-backwards? check out the magazine articles at the bottom of this page http://www.theoldone.com/articles/ Bill, i'm interested to hear what you think of Larry's 'soft heads'.. i know he was talking 'static' compressions of 20:1, and dynamic will be a lot lower with the cams they run, but it's interesting nonetheless... Cya, Stewart edit: maybe i'll just let Bill answer next time [Updated on: Wed, 27 October 2004 02:46] [Report message to a moderator]

	Subject	Poster	Date
	Head flow and flame propegation issues in turbocharged cars	Shraka	Wed, 27 October 2004 02:14
	Re: Head flow and flame propegation issues in turbocharged cars	Bill Sherwood	Wed, 27 October 2004 02:21
	Re: Head flow and flame propegation issues in turbocharged cars	Shraka	Wed, 27 October 2004 02:30
	Re: Head flow and flame propegation issues in turbocharged cars	oldcorollas	Wed, 27 October 2004 02:44
	Re: Head flow and flame propegation issues in turbocharged cars	oldcorollas	Wed, 27 October 2004 02:50
	Re: Head flow and flame propegation issues in turbocharged cars	Bill Sherwood	Wed, 27 October 2004 02:56
	Re: Head flow and flame propegation issues in turbocharged cars	oldcorollas	Wed, 27 October 2004 02:58
	Re: Head flow and flame propegation issues in turbocharged cars	Bill Sherwood	Wed, 27 October 2004 02:43
	Re: Head flow and flame propegation issues in turbocharged cars	Shraka	Wed, 27 October 2004 02:57
	Re: Head flow and flame propegation issues in turbocharged cars	Bill Sherwood	Wed, 27 October 2004 03:06
	Re: Head flow and flame propegation issues in turbocharged cars	Bill Sherwood	Wed, 27 October 2004 02:49
	Re: Head flow and flame propegation issues in turbocharged cars	Shraka	Wed, 27 October 2004 03:39
	Re: Head flow and flame propegation issues in turbocharged cars	oldcorollas	Wed, 27 October 2004 03:49
	Re: Head flow and flame propegation issues in turbocharged cars	Bill Sherwood	Wed, 27 October 2004 04:00
	Re: Head flow and flame propegation issues in turbocharged cars	Shraka	Wed, 27 October 2004 04:20
	Re: Head flow and flame propegation issues in turbocharged cars	Joshstix	Wed, 27 October 2004 04:28
	Re: Head flow and flame propegation issues in turbocharged cars	Shraka	Wed, 27 October 2004 06:29
	Re: Head flow and flame propegation issues in turbocharged cars	indigoid	Thu, 28 October 2004 11:40
	Re: Head flow and flame propegation issues in turbocharged cars	Shraka	Fri, 29 October 2004 03:23
	Re: Head flow and flame propegation issues in turbocharged cars	da_horse	Wed, 27 October 2004 20:34
	Re: Head flow and flame propegation issues in turbocharged cars	Norbie	Thu, 28 October 2004 01:49
	Re: Head flow and flame propegation issues in turbocharged cars	da_horse	Thu, 28 October 2004 11:24
	Re: Head flow and flame propegation issues in turbocharged cars	rokusan	Thu, 28 October 2004 12:04
	Re: Head flow and flame propegation issues in turbocharged cars	takai	Fri, 29 October 2004 12:41
	Re: Head flow and flame propegation issues in turbocharged cars	indigoid	Fri, 29 October 2004 12:44
	Re: Head flow and flame propegation issues in turbocharged cars	RWDboy	Fri, 29 October 2004 14:25
	Re: Head flow and flame propegation issues in turbocharged cars	M.W.P.	Fri, 29 October 2004 16:44
	Re: Head flow and flame propegation issues in turbocharged cars	RWDboy	Sat, 30 October 2004 03:59
	Re: Head flow and flame propegation issues in turbocharged cars	Shraka	Mon, 01 November 2004 03:15
	Re: Head flow and flame propegation issues in turbocharged cars	RWDboy	Mon, 01 November 2004 03:54
	Re: Head flow and flame propegation issues in turbocharged cars	Joshstix	Mon, 01 November 2004 06:04
	Re: Head flow and flame propegation issues in turbocharged cars	Shraka	Mon, 01 November 2004 06:15
	Re: Head flow and flame propegation issues in turbocharged cars	oldcorollas	Mon, 01 November 2004 06:18
	Re: Head flow and flame propegation issues in turbocharged cars	justcallmefrank	Mon, 01 November 2004 06:19
	Re: Head flow and flame propegation issues in turbocharged cars	Joshstix	Mon, 01 November 2004 06:21
	Re: Head flow and flame propegation issues in turbocharged cars	oldcorollas	Mon, 01 November 2004 06:48
	Re: Head flow and flame propegation issues in turbocharged cars	justcallmefrank	Mon, 01 November 2004 07:34
	Re: Head flow and flame propegation issues in turbocharged cars	Mr DOHC	Mon, 01 November 2004 08:28
	Re: Head flow and flame propegation issues in turbocharged cars	Shraka	Mon, 01 November 2004 09:26
	Re: Head flow and flame propegation issues in turbocharged cars	oldcorollas	Mon, 01 November 2004 09:04
	Re: Head flow and flame propegation issues in turbocharged cars	justcallmefrank	Mon, 01 November 2004 09:07
	Re: Head flow and flame propegation issues in turbocharged cars	Shraka	Mon, 01 November 2004 09:27
	Re: Head flow and flame propegation issues in turbocharged cars	justcallmefrank	Mon, 01 November 2004 09:32
	Re: Head flow and flame propegation issues in turbocharged cars	RWDboy	Mon, 01 November 2004 13:08
	Re: Head flow and flame propegation issues in turbocharged cars	Shraka	Mon, 01 November 2004 13:13
	Re: Head flow and flame propegation issues in turbocharged cars	earlyrolla	Mon, 01 November 2004 14:38

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