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170bhp Regular Registered: January 2004	Re: Is 5 valve better than 4 valve? Sat, 28 May 2005 06:39 To clarify how the VE was increased on the 20v with flow bench, the flow and intake tract were looked at, using isoentropic pressure data and reimann data we see that immediately before the intake valve is opened that a higher pressure than found on a 16v is found, this along with a higher intake pressure recovery with regards to location of piston in the cycle of events increased the mass air flow through the head, this increase in positive pressure in both these places is not as strong as on a 16v, this was at all lifts, mind you only lifts up to 9mm were used as there aren't too many cams with much more lift than this available for 20v, but the fact of the matter was that this inertial tuning was much stronger on 20v and I think it's not something that can be taken into consideration if you compare these motors back to back on paper, so many time I have laid waste to so called high HP 16v, I believe the 20v is more a sum of it's parts than just sitting down and saying compared to 16v the "insert different component here" is not as good as 16v!!!I have yet to see a 16v 4age with as wide a power band as a comparative 20v on the dyno, they usually end up much peakier, the 20v's always have a much wider flatter torque curve, give me that any day!! it's all about the area under the curve, if my curve has a lot more under it (all things like weight, gearing etc) the car will be faster. [Report message to a moderator]

	Subject	Poster	Date
	Is 5 valve better than 4 valve?	170bhp	Fri, 27 May 2005 12:54
	Re: Is 5 valve better than 4 valve?	Big T	Fri, 27 May 2005 13:39
	Re: Is 5 valve better than 4 valve?	oldcorollas	Fri, 27 May 2005 14:49
	Re: Is 5 valve better than 4 valve?	takai	Fri, 27 May 2005 15:09
	Re: Is 5 valve better than 4 valve?	Jonny2TG	Fri, 27 May 2005 15:34
	Re: Is 5 valve better than 4 valve?	takai	Sat, 28 May 2005 00:26
	Re: Is 5 valve better than 4 valve?	CLG	Sat, 28 May 2005 01:12
	Re: Is 5 valve better than 4 valve?	Jonny2TG	Sat, 28 May 2005 01:42
	Re: Is 5 valve better than 4 valve?	170bhp	Sat, 28 May 2005 05:16
	Re: Is 5 valve better than 4 valve?	floody	Tue, 31 May 2005 13:06
	Re: Is 5 valve better than 4 valve?	Bill Sherwood	Sat, 28 May 2005 05:33
	Re: Is 5 valve better than 4 valve?	Henn	Sat, 28 May 2005 05:41
	Re: Is 5 valve better than 4 valve?	Bill Sherwood	Sat, 28 May 2005 05:48
	Re: Is 5 valve better than 4 valve?	Bill Sherwood	Sat, 28 May 2005 05:46
	Re: Is 5 valve better than 4 valve?	170bhp	Sat, 28 May 2005 06:05
	Re: Is 5 valve better than 4 valve?	Bill Sherwood	Sat, 28 May 2005 06:07
	Re: Is 5 valve better than 4 valve?	Acoustic	Tue, 31 May 2005 16:03
	Re: Is 5 valve better than 4 valve?	170bhp	Sat, 28 May 2005 06:10
	Re: Is 5 valve better than 4 valve?	Bill Sherwood	Sat, 28 May 2005 06:15
	Re: Is 5 valve better than 4 valve?	170bhp	Sat, 28 May 2005 06:14
	Re: Is 5 valve better than 4 valve?	Bill Sherwood	Sat, 28 May 2005 06:17
	Re: Is 5 valve better than 4 valve?	shinybluesteel	Sat, 28 May 2005 06:40
	Re: Is 5 valve better than 4 valve?	JFAllen	Sat, 28 May 2005 07:28
	Re: Is 5 valve better than 4 valve?	170bhp	Sat, 28 May 2005 06:39
	Re: Is 5 valve better than 4 valve?	Bill Sherwood	Sat, 28 May 2005 06:43
	Re: Is 5 valve better than 4 valve?	170bhp	Sat, 28 May 2005 06:43
	Re: Is 5 valve better than 4 valve?	170bhp	Sat, 28 May 2005 06:45
	Re: Is 5 valve better than 4 valve?	170bhp	Sat, 28 May 2005 06:48
	Re: Is 5 valve better than 4 valve?	170bhp	Sat, 28 May 2005 06:58
	Re: Is 5 valve better than 4 valve?	Jonny2TG	Sat, 28 May 2005 07:52
	Re: Is 5 valve better than 4 valve?	takai	Sat, 28 May 2005 08:24
	Re: Is 5 valve better than 4 valve?	bored	Sat, 28 May 2005 10:45
	Re: Is 5 valve better than 4 valve?	Bill Sherwood	Sat, 28 May 2005 10:08
	Re: Is 5 valve better than 4 valve?	170bhp	Sat, 28 May 2005 11:12
	Re: Is 5 valve better than 4 valve?	170bhp	Sat, 28 May 2005 11:14
	Re: Is 5 valve better than 4 valve?	Bill Sherwood	Sat, 28 May 2005 11:24
	Re: Is 5 valve better than 4 valve?	takai	Sat, 28 May 2005 11:19
	Re: Is 5 valve better than 4 valve?	170bhp	Sat, 28 May 2005 11:32
	Re: Is 5 valve better than 4 valve?	bored	Sat, 28 May 2005 11:40
	Re: Is 5 valve better than 4 valve?	takai	Sat, 28 May 2005 11:43
	Re: Is 5 valve better than 4 valve?	170bhp	Sat, 28 May 2005 11:48
	Re: Is 5 valve better than 4 valve?	170bhp	Sat, 28 May 2005 11:49
	Re: Is 5 valve better than 4 valve?	takai	Sat, 28 May 2005 11:53
	Re: Is 5 valve better than 4 valve?	IRA11Y	Mon, 06 June 2005 07:26
	Re: Is 5 valve better than 4 valve?	ke382TG	Sat, 28 May 2005 11:50
	Re: Is 5 valve better than 4 valve?	170bhp	Sat, 28 May 2005 11:59
	Re: Is 5 valve better than 4 valve?	ke382TG	Sat, 28 May 2005 12:37
	Re: Is 5 valve better than 4 valve?	Bill Sherwood	Sat, 28 May 2005 13:58
	Re: Is 5 valve better than 4 valve?	boudan	Sat, 28 May 2005 15:22
	Re: Is 5 valve better than 4 valve?	Acoustic	Tue, 31 May 2005 16:16
	Re: Is 5 valve better than 4 valve?	*rivmasta*	Wed, 01 June 2005 00:38
	Re: Is 5 valve better than 4 valve?	off-road	Sun, 05 June 2005 09:14
	Re: Is 5 valve better than 4 valve?	off-road	Sun, 05 June 2005 09:31
	Re: Is 5 valve better than 4 valve?	Bill Sherwood	Sun, 29 May 2005 01:29
	Re: Is 5 valve better than 4 valve?	Ben Wilson	Tue, 31 May 2005 00:03
	Re: Is 5 valve better than 4 valve?	Joshstix	Sun, 29 May 2005 02:26
	Re: Is 5 valve better than 4 valve?	Bill Sherwood	Sun, 29 May 2005 08:14
	Re: Is 5 valve better than 4 valve?	SEXY 16	Sun, 29 May 2005 09:41
	Re: Is 5 valve better than 4 valve?	river	Sun, 29 May 2005 11:53
	Re: Is 5 valve better than 4 valve?	170bhp	Sun, 29 May 2005 12:00
	Re: Is 5 valve better than 4 valve?	Bill Sherwood	Sun, 29 May 2005 12:08
	Re: Is 5 valve better than 4 valve?	170bhp	Sun, 29 May 2005 12:11
	Re: Is 5 valve better than 4 valve?	Mr Revhead	Sun, 29 May 2005 12:34
	Re: Is 5 valve better than 4 valve?	oldcorollas	Sun, 29 May 2005 13:35
	Re: Is 5 valve better than 4 valve?	ROLLA GTi	Sun, 29 May 2005 13:45
	Re: Is 5 valve better than 4 valve?	Jonny2TG	Sun, 29 May 2005 14:15
	Re: Is 5 valve better than 4 valve?	Bill Sherwood	Sun, 29 May 2005 14:58
	Re: Is 5 valve better than 4 valve?	THE WITZL	Mon, 30 May 2005 02:34
	Re: Is 5 valve better than 4 valve?	funkdoc	Mon, 30 May 2005 11:02
	Re: Is 5 valve better than 4 valve?	4agte	Mon, 06 June 2005 08:18
	Re: Is 5 valve better than 4 valve?	floody	Mon, 06 June 2005 09:57
	Re: Is 5 valve better than 4 valve?	4agte	Mon, 06 June 2005 10:10
	Re: Is 5 valve better than 4 valve?	floody	Tue, 07 June 2005 04:13
	Re: Is 5 valve better than 4 valve?	170bhp	Mon, 30 May 2005 09:14
	Re: Is 5 valve better than 4 valve?	170bhp	Mon, 30 May 2005 09:18
	Re: Is 5 valve better than 4 valve?	Bill Sherwood	Tue, 31 May 2005 10:36
	Re: Is 5 valve better than 4 valve?	Jonny2TG	Mon, 30 May 2005 15:37
	Re: Is 5 valve better than 4 valve?	Johnny	Mon, 30 May 2005 15:55
	Re: Is 5 valve better than 4 valve?	justcallmefrank	Tue, 31 May 2005 02:07
	Re: Is 5 valve better than 4 valve?	takai	Tue, 31 May 2005 00:26
	Re: Is 5 valve better than 4 valve?	Ben Wilson	Tue, 31 May 2005 01:02
	Re: Is 5 valve better than 4 valve?	takai	Tue, 31 May 2005 01:04
	Re: Is 5 valve better than 4 valve?	THE WITZL	Tue, 31 May 2005 07:41
	Re: Is 5 valve better than 4 valve?	Jonny2TG	Tue, 31 May 2005 08:23
	Re: Is 5 valve better than 4 valve?	170bhp	Tue, 31 May 2005 11:40
	Re: Is 5 valve better than 4 valve?	Bill Sherwood	Tue, 31 May 2005 11:56
	Re: Is 5 valve better than 4 valve?	Merudo	Tue, 31 May 2005 11:57
	Re: Is 5 valve better than 4 valve?	xolent	Tue, 31 May 2005 12:17
	Re: Is 5 valve better than 4 valve?	170bhp	Tue, 31 May 2005 12:25
	Re: Is 5 valve better than 4 valve?	Bill Sherwood	Tue, 31 May 2005 12:43
	Re: Is 5 valve better than 4 valve?	170bhp	Tue, 31 May 2005 12:34
	Re: Is 5 valve better than 4 valve?	Bill Sherwood	Tue, 31 May 2005 12:57
	Re: Is 5 valve better than 4 valve?	takai	Tue, 31 May 2005 13:13
	Re: Is 5 valve better than 4 valve?	funkdoc	Wed, 01 June 2005 12:41
	Re: Is 5 valve better than 4 valve?	Bill Sherwood	Wed, 01 June 2005 14:04
	Re: Is 5 valve better than 4 valve?	emmac	Wed, 01 June 2005 14:45
	Re: Is 5 valve better than 4 valve?	rx-3 ip	Sat, 04 June 2005 06:26
	Re: Is 5 valve better than 4 valve?	170bhp	Sun, 05 June 2005 13:15
	Re: Is 5 valve better than 4 valve?	Bill Sherwood	Sun, 05 June 2005 13:47
	Re: Is 5 valve better than 4 valve?	Kr0n1k	Sun, 05 June 2005 17:34
	Re: Is 5 valve better than 4 valve?	170bhp	Sun, 05 June 2005 22:28
	Re: Is 5 valve better than 4 valve?	EMP-2TG	Sun, 05 June 2005 23:50
	Re: Is 5 valve better than 4 valve?	off-road	Sun, 05 June 2005 23:34
	Re: Is 5 valve better than 4 valve?	Bill Sherwood	Sun, 05 June 2005 23:40
	Re: Is 5 valve better than 4 valve?	jkvsnn	Tue, 07 June 2005 03:19
	Re: Is 5 valve better than 4 valve?	Bill Sherwood	Tue, 07 June 2005 03:34
	Re: Is 5 valve better than 4 valve?	Bill Sherwood	Sun, 05 June 2005 23:44
	Re: Is 5 valve better than 4 valve?	SEXY 16	Mon, 06 June 2005 01:00
	Re: Is 5 valve better than 4 valve?	oldcorollas	Mon, 06 June 2005 02:01
	Re: Is 5 valve better than 4 valve?	off-road	Mon, 06 June 2005 02:40
	Re: Is 5 valve better than 4 valve?	Bill Sherwood	Mon, 06 June 2005 04:02
	Re: Is 5 valve better than 4 valve?	oldcorollas	Mon, 06 June 2005 07:04
	Re: Is 5 valve better than 4 valve?	*rivmasta*	Mon, 06 June 2005 07:29
	Re: Is 5 valve better than 4 valve?	*rivmasta*	Mon, 06 June 2005 07:32
	Re: Is 5 valve better than 4 valve?	Bill Sherwood	Mon, 06 June 2005 08:14
	Re: Is 5 valve better than 4 valve?	takai	Mon, 06 June 2005 09:06
	Re: Is 5 valve better than 4 valve?	4agte	Mon, 06 June 2005 09:11
	Re: Is 5 valve better than 4 valve?	takai	Mon, 06 June 2005 11:38
	Re: Is 5 valve better than 4 valve?	Bobski	Mon, 06 June 2005 16:41
	Re: Is 5 valve better than 4 valve?	Blown86	Mon, 06 June 2005 23:30
	Re: Is 5 valve better than 4 valve?	Corona RT142	Mon, 06 June 2005 23:31
	Re: Is 5 valve better than 4 valve?	adamaw11	Tue, 07 June 2005 01:26
	Re: Is 5 valve better than 4 valve?	Bill Sherwood	Tue, 07 June 2005 02:54
	Re: Is 5 valve better than 4 valve?	shinybluesteel	Tue, 07 June 2005 03:03
	Re: Is 5 valve better than 4 valve?	lumpy	Tue, 07 June 2005 05:52
	Re: Is 5 valve better than 4 valve?	oldcorollas	Fri, 10 June 2005 01:50
	Re: Is 5 valve better than 4 valve?	TheStitt	Wed, 08 June 2005 06:24
	Re: Is 5 valve better than 4 valve?	510rob	Thu, 09 June 2005 19:48
	Re: Is 5 valve better than 4 valve?	takai	Fri, 10 June 2005 04:23
	Re: Is 5 valve better than 4 valve?	oldcorollas	Fri, 10 June 2005 04:57
	Re: Is 5 valve better than 4 valve?	Mr Revhead	Fri, 10 June 2005 05:49
	Re: Is 5 valve better than 4 valve?	oldcorollas	Fri, 10 June 2005 06:21
	Re: Is 5 valve better than 4 valve?	Mr Revhead	Fri, 10 June 2005 07:02
	Re: Is 5 valve better than 4 valve?	oldcorollas	Fri, 10 June 2005 07:24

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