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YelloRolla Forums Junkie Location: On your mum! Registered: May 2002	Re: Exhaust Myth... Fact or Fiction? Thu, 10 February 2005 08:06 Wow Stew you have got too much time on your hands to go typing all of that. There are a couple of points that have not been accurately conveyed IMO. 1) Top fuelers - short primaries because they are supercharged - the supercharger blows a fresh charge across the the top of the piston on overlap ensuring that there is no torque-robbing exhaust gas to contaminate the intake charge (length is as Stewart has pointed out - a top fueler is at 7500 to 8000rpm the entire time that the throttle is open). 2) Back pressure robs power - especially when manifold pressure is low - exhaust gas often flows backwards thru the open intake valve and into the intake manifold. The effect that this has on the BMEP of the engine is considerable. 3) Short pipes lead to the "atmospheric pressure" (love it ) reaching the exhuast valve very quickly. Having vacuum in the intake and atmospheric at the exhaust while both valves are open = reversion = no good for power. Keeping the exhaust pulse intact and maximising the benefit of the negative pulse is what this is all about. 4) DON'T belive anything that you read here - Do what Old Corollas has suggested - get the book and read it. Stewart - I think that I have caught your typing bug arrgghhh. DON'T EVER BELIEVE THAT BACKPRESSURE IS HELPING TORQUE, or you are missing the point entirely. [Report message to a moderator]

	Subject	Poster	Date
	Exhaust Myth... Fact or Fiction?	Matt-itude	Wed, 09 February 2005 08:13
	Re: Exhaust Myth... Fact or Fiction?	Kyosho	Wed, 09 February 2005 08:24
	Re: Exhaust Myth... Fact or Fiction?	Matt-itude	Wed, 09 February 2005 08:29
	Re: Exhaust Myth... Fact or Fiction?	Fr3aK	Wed, 09 February 2005 09:11
	Re: Exhaust Myth... Fact or Fiction?	oldcorollas	Wed, 09 February 2005 09:36
	Re: Exhaust Myth... Fact or Fiction?	Kyosho	Wed, 09 February 2005 09:34
	Re: Exhaust Myth... Fact or Fiction?	oldcorollas	Wed, 09 February 2005 08:47
	Re: Exhaust Myth... Fact or Fiction?	Matt-itude	Wed, 09 February 2005 08:51
	Re: Exhaust Myth... Fact or Fiction?	oldcorollas	Wed, 09 February 2005 08:57
	Re: Exhaust Myth... Fact or Fiction?	towe_001	Fri, 11 March 2005 12:23
	Re: Exhaust Myth... Fact or Fiction?	draven	Wed, 09 February 2005 08:37
	Re: Exhaust Myth... Fact or Fiction?	Matt-itude	Wed, 09 February 2005 08:43
	Re: Exhaust Myth... Fact or Fiction?	oldcorollas	Wed, 09 February 2005 08:49
	Re: Exhaust Myth... Fact or Fiction?	Farkurnell	Wed, 09 February 2005 09:30
	Re: Exhaust Myth... Fact or Fiction?	Kyosho	Wed, 09 February 2005 09:36
	Re: Exhaust Myth... Fact or Fiction?	oldcorollas	Wed, 09 February 2005 09:40
	Re: Exhaust Myth... Fact or Fiction?	selk	Mon, 14 March 2005 08:39
	Re: Exhaust Myth... Fact or Fiction?	R-jay	Mon, 14 March 2005 19:49
	Re: Exhaust Myth... Fact or Fiction?	ke30king	Wed, 16 March 2005 12:25
	Re: Exhaust Myth... Fact or Fiction?	Farkurnell	Wed, 09 February 2005 09:45
	Re: Exhaust Myth... Fact or Fiction?	draven	Wed, 09 February 2005 09:47
	Re: Exhaust Myth... Fact or Fiction?	justcallmefrank	Wed, 09 February 2005 10:12
	Re: Exhaust Myth... Fact or Fiction?	MR 1JZ	Thu, 10 February 2005 00:58
	Re: Exhaust Myth... Fact or Fiction?	chrisss	Wed, 09 February 2005 09:49
	Re: Exhaust Myth... Fact or Fiction?	rokusan	Wed, 09 February 2005 10:26
	Re: Exhaust Myth... Fact or Fiction?	Bugman	Wed, 09 February 2005 22:28
	Re: Exhaust Myth... Fact or Fiction?	willwal98	Wed, 09 February 2005 22:30
	Re: Exhaust Myth... Fact or Fiction?	Bugman	Wed, 09 February 2005 22:41
	Re: Exhaust Myth... Fact or Fiction?	Mr Revhead	Wed, 09 February 2005 23:55
	Re: Exhaust Myth... Fact or Fiction?	OPPY	Thu, 10 February 2005 02:16
	Re: Exhaust Myth... Fact or Fiction?	oldcorollas	Thu, 10 February 2005 05:22
	Re: Exhaust Myth... Fact or Fiction?	oldcorollas	Thu, 10 February 2005 05:25
	Re: Exhaust Myth... Fact or Fiction?	greenta22	Thu, 10 February 2005 02:32
	Re: Exhaust Myth... Fact or Fiction?	buck naked	Thu, 10 February 2005 03:47
	Re: Exhaust Myth... Fact or Fiction?	Sam_Q	Thu, 10 February 2005 07:22
	Re: Exhaust Myth... Fact or Fiction?	oldcorollas	Thu, 10 February 2005 07:45
	Re: Exhaust Myth... Fact or Fiction?	oldcorollas	Thu, 10 February 2005 07:57
	Re: Exhaust Myth... Fact or Fiction?	Sam_Q	Thu, 10 February 2005 07:53
	Re: Exhaust Myth... Fact or Fiction?	oldcorollas	Thu, 10 February 2005 07:59
	Re: Exhaust Myth... Fact or Fiction?	YelloRolla	Thu, 10 February 2005 08:06
	Re: Exhaust Myth... Fact or Fiction?	Mr Revhead	Thu, 10 February 2005 09:54
	Re: Exhaust Myth... Fact or Fiction?	Big T	Thu, 10 February 2005 10:57
	Re: Exhaust Myth... Fact or Fiction?	jkvsnn	Thu, 10 February 2005 11:57
	Re: Exhaust Myth... Fact or Fiction?	oldcorollas	Fri, 11 February 2005 05:24
	Re: Exhaust Myth... Fact or Fiction?	jkvsnn	Wed, 16 February 2005 22:58
	Re: Exhaust Myth... Fact or Fiction?	oldcorollas	Thu, 10 March 2005 08:25
	Re: Exhaust Myth... Fact or Fiction?	indigoid	Thu, 10 March 2005 09:22
	Re: Exhaust Myth... Fact or Fiction?	greenta22	Thu, 10 March 2005 23:07
	Re: Exhaust Myth... Fact or Fiction?	oldcorollas	Fri, 11 March 2005 00:34
	Re: Exhaust Myth... Fact or Fiction?	Hunty	Thu, 10 February 2005 12:09
	Re: Exhaust Myth... Fact or Fiction?	Byatch	Sat, 12 February 2005 05:57
	Re: Exhaust Myth... Fact or Fiction?	3S-GE_Man	Sat, 12 February 2005 06:52
	Re: Exhaust Myth... Fact or Fiction?	EMD-AE86	Sat, 12 February 2005 08:25
	Re: Exhaust Myth... Fact or Fiction?	RWDboy	Sat, 12 February 2005 13:25
	Re: Exhaust Myth... Fact or Fiction?	Dunno	Sun, 13 February 2005 13:08
	Re: Exhaust Myth... Fact or Fiction?	Hunty	Thu, 17 February 2005 02:01
	Re: Exhaust Myth... Fact or Fiction?	jkvsnn	Thu, 17 February 2005 02:13
	Re: Exhaust Myth... Fact or Fiction?	79Rona	Fri, 11 March 2005 00:57
	Re: Exhaust Myth... Fact or Fiction?	mick	Fri, 11 March 2005 10:10
	Re: Exhaust Myth... Fact or Fiction?	Toobs	Sat, 12 March 2005 14:54
	Re: Exhaust Myth... Fact or Fiction?	river	Sat, 12 March 2005 23:33
	Re: Exhaust Myth... Fact or Fiction?	towe_001	Mon, 14 March 2005 01:36
	Re: Exhaust Myth... Fact or Fiction?	notorius	Mon, 14 March 2005 04:41
	Re: Exhaust Myth... Fact or Fiction?	73ke25	Tue, 15 March 2005 11:04
	Re: Exhaust Myth... Fact or Fiction?	hemi twofifteen turbo	Tue, 15 March 2005 12:13
	Re: Exhaust Myth... Fact or Fiction?	Norbie	Tue, 15 March 2005 12:42
	Re: Exhaust Myth... Fact or Fiction?	73ke25	Wed, 16 March 2005 12:30
	Re: Exhaust Myth... Fact or Fiction?	Norbie	Wed, 16 March 2005 13:37
	Re: Exhaust Myth... Fact or Fiction?	greenta22	Mon, 14 March 2005 07:33
	Re: Exhaust Myth... Fact or Fiction?	notorius	Mon, 14 March 2005 08:33
	Re: Exhaust Myth... Fact or Fiction?	Allan	Tue, 15 March 2005 13:01
	Re: Exhaust Myth... Fact or Fiction?	510rob	Tue, 15 March 2005 17:32
	Re: Exhaust Myth... Fact or Fiction?	R-jay	Tue, 15 March 2005 22:58
	Re: Exhaust Myth... Fact or Fiction?	510rob	Tue, 15 March 2005 23:00
	Re: Exhaust Myth... Fact or Fiction?	jeffro RA28	Wed, 16 March 2005 09:24
	Re: Exhaust Myth... Fact or Fiction?	YelloRolla	Wed, 16 March 2005 09:59
	Re: Exhaust Myth... Fact or Fiction?	oldcorollas	Wed, 16 March 2005 11:17
	Re: Exhaust Myth... Fact or Fiction?	jeffro RA28	Thu, 17 March 2005 09:10
	Re: Exhaust Myth... Fact or Fiction?	jeffro RA28	Wed, 16 March 2005 10:45
	Re: Exhaust Myth... Fact or Fiction?	ke30king	Wed, 16 March 2005 12:57
	Re: Exhaust Myth... Fact or Fiction?	ViPeR_NiPPleX	Wed, 16 March 2005 13:41
	Re: Exhaust Myth... Fact or Fiction?	tom210	Wed, 30 March 2005 14:13

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