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Shraka Forums Junkie Location: Melbourne Registered: November 2003	Re: 4A: G vs F heads Tue, 26 October 2004 07:25 Norbie wrote on Tue, 26 October 2004 16:51 I think it depends on the combustion chamber type used. For example, the 18R-G has a hemispherical combustion chamber so a wide valve angle is going to work well with that. The 7A-FE has a pentroof CC I think? So to my simple way of thinking, a narrow angle is going to work better with that. Yes, sorry I should have clarified. I was talking about the pentroof style chamber head, not the Hemi style head. I'm trying to figure out why a Nissan SR20DET can produce as much power as a 3S-GTE. The 3S uses a wide angle head, and the SR20 goes so far as to have rockers to make the head angle narrow! Now understandably a narrow angle is desirable for high compression engines where the shape of the piston becomes an issue to increase compression, but I was wondering if it makes any difference in a low compression engine. And I assume by the list of responses, nobody has any idea why Toyota went with the wide angle head? Or was it Yamaha? Either way... wait, could it be that Yamaha's RnD all whent into making bikes? The angle of the head would have an effect of the height of the engine and thusly compromise packaging perhaps? I'm not saying Yamaha just threw a bike head onto the 4A-GE, but with all RnD focused in one area, it would cost a lot of money to deverge and make a good close angle head (I imagine). Though I'm probably way off. [Report message to a moderator]

	Subject	Poster	Date
	4A: G vs F heads	Henn	Thu, 21 October 2004 13:47
	Re: 4A: G vs F heads	Norbie	Fri, 22 October 2004 00:06
	Re: 4A: G vs F heads	rob_RA40	Fri, 22 October 2004 00:09
	Re: 4A: G vs F heads	b1gb3n	Fri, 22 October 2004 02:26
	Re: 4A: G vs F heads	rob_RA40	Fri, 22 October 2004 04:51
	Re: 4A: G vs F heads	b1gb3n	Fri, 22 October 2004 06:15
	Re: 4A: G vs F heads	Bill Sherwood	Fri, 22 October 2004 04:01
	Re: 4A: G vs F heads	EVOSTi	Fri, 22 October 2004 06:15
	Re: 4A: G vs F heads	ae95	Fri, 22 October 2004 06:19
	Re: 4A: G vs F heads	SEXY 16	Fri, 22 October 2004 06:41
	Re: 4A: G vs F heads	wuzah?	Fri, 22 October 2004 10:51
	Re: 4A: G vs F heads	NuGeN	Fri, 22 October 2004 11:41
	Re: 4A: G vs F heads	Henn	Fri, 22 October 2004 13:34
	Re: 4A: G vs F heads	Bill Sherwood	Fri, 22 October 2004 14:16
	Re: 4A: G vs F heads	Henn	Fri, 22 October 2004 15:13
	Re: 4A: G vs F heads	cwhelan	Mon, 25 October 2004 01:59
	Re: 4A: G vs F heads	drift86levin	Mon, 25 October 2004 03:03
	Re: 4A: G vs F heads	b1gb3n	Mon, 25 October 2004 07:53
	Re: 4A: G vs F heads	takai	Wed, 27 October 2004 21:52
	Re: 4A: G vs F heads	SEXY 16	Mon, 25 October 2004 09:23
	Re: 4A: G vs F heads	Bill Sherwood	Mon, 25 October 2004 10:09
	Re: 4A: G vs F heads	SEXY 16	Mon, 25 October 2004 21:27
	Re: 4A: G vs F heads	Johnny	Tue, 26 October 2004 02:27
	Re: 4A: G vs F heads	Bill Sherwood	Tue, 26 October 2004 02:57
	Re: 4A: G vs F heads	Shraka	Tue, 26 October 2004 03:02
	Re: 4A: G vs F heads	Bill Sherwood	Tue, 26 October 2004 03:42
	Re: 4A: G vs F heads	Norbie	Tue, 26 October 2004 03:33
	Re: 4A: G vs F heads	mrshin	Tue, 26 October 2004 04:15
	Re: 4A: G vs F heads	Shraka	Tue, 26 October 2004 04:53
	Re: 4A: G vs F heads	Bill Sherwood	Tue, 26 October 2004 05:04
	Re: 4A: G vs F heads	b1gb3n	Tue, 26 October 2004 05:04
	Re: 4A: G vs F heads	Bill Sherwood	Tue, 26 October 2004 06:28
	Re: 4A: G vs F heads	Shraka	Tue, 26 October 2004 06:45
	Re: 4A: G vs F heads	mrshin	Tue, 26 October 2004 06:17
	Re: 4A: G vs F heads	Norbie	Tue, 26 October 2004 06:51
	Re: 4A: G vs F heads	Shraka	Tue, 26 October 2004 07:25
	Re: 4A: G vs F heads	Bill Sherwood	Tue, 26 October 2004 07:53
	Re: 4A: G vs F heads	Johnny	Tue, 26 October 2004 10:49
	Re: 4A: G vs F heads	mrshin	Tue, 26 October 2004 14:17
	Re: 4A: G vs F heads	oldcorollas	Tue, 26 October 2004 14:27
	Re: 4A: G vs F heads	mrshin	Tue, 26 October 2004 14:36
	Re: 4A: G vs F heads	quest	Tue, 26 October 2004 15:36
	Re: 4A: G vs F heads	b1gb3n	Tue, 26 October 2004 15:48
	Re: 4A: G vs F heads	4DaDrift	Tue, 26 October 2004 15:50
	Re: 4A: G vs F heads	Shraka	Wed, 27 October 2004 00:08
	Re: 4A: G vs F heads	Bill Sherwood	Wed, 27 October 2004 01:49
	Re: 4A: G vs F heads	oldcorollas	Wed, 27 October 2004 15:22
	Re: 4A: G vs F heads	Tofuboi	Tue, 26 October 2004 21:53
	Re: 4A: G vs F heads	Shraka	Wed, 27 October 2004 02:02
	Re: 4A: G vs F heads	quest	Wed, 27 October 2004 06:30
	Re: 4A: G vs F heads	quest	Wed, 27 October 2004 06:59
	Re: 4A: G vs F heads	quest	Wed, 27 October 2004 07:21
	Re: 4A: G vs F heads	oldcorollas	Wed, 27 October 2004 07:34
	Re: 4A: G vs F heads	Henn	Wed, 27 October 2004 06:58
	Re: 4A: G vs F heads	Shraka	Wed, 27 October 2004 07:31
	Re: 4A: G vs F heads	takai	Wed, 27 October 2004 07:58
	Re: 4A: G vs F heads	quest	Wed, 27 October 2004 14:32
	Re: 4A: G vs F heads	oldcorollas	Wed, 27 October 2004 15:08
	Re: 4A: G vs F heads	Tats	Wed, 27 October 2004 23:26
	Re: 4A: G vs F heads	Johnny	Thu, 28 October 2004 00:48
	Re: 4A: G vs F heads	Shraka	Thu, 28 October 2004 02:21
	Re: 4A: G vs F heads	Johnny	Thu, 28 October 2004 03:44
	Re: 4A: G vs F heads	Bill Sherwood	Thu, 28 October 2004 04:30
	Re: 4A: G vs F heads	b1gb3n	Thu, 28 October 2004 05:24
	Re: 4A: G vs F heads	koen	Thu, 28 October 2004 04:52
	Re: 4A: G vs F heads	Norbie	Thu, 28 October 2004 05:09
	Re: 4A: G vs F heads	justcallmefrank	Thu, 28 October 2004 05:24
	Re: 4A: G vs F heads	Bill Sherwood	Thu, 28 October 2004 05:17
	Re: 4A: G vs F heads	Bill Sherwood	Thu, 28 October 2004 05:29
	Re: 4A: G vs F heads	oldcorollas	Tue, 02 November 2004 08:10
	Re: 4A: G vs F heads	Shraka	Thu, 28 October 2004 07:05
	Re: 4A: G vs F heads	da_horse	Thu, 28 October 2004 08:36
	Re: 4A: G vs F heads	justcallmefrank	Thu, 28 October 2004 08:45
	Re: 4A: G vs F heads	Shraka	Mon, 01 November 2004 03:10
	Re: 4A: G vs F heads	justcallmefrank	Mon, 01 November 2004 03:11
	Re: 4A: G vs F heads	Shraka	Mon, 01 November 2004 03:18
	Re: 4A: G vs F heads	86tt	Mon, 01 November 2004 14:15
	Re: 4A: G vs F heads	takai	Tue, 02 November 2004 07:41

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