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Toymods » Tech & Conversions » Cost of porting&polishing and other engine work? Show: Today's Posts  :: Show Polls  Email to friend

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gianttomato Forums Junkie I supported Toymods Location: I renounced punctuation Registered: May 2002	Re: Cost of porting&polishing and other engine work? Fri, 06 September 2002 01:20 Cost of head work will depend on how far you want to go. Obviously 4 cylinders costs less than a V8. Cleaning out of casting dags and match porting will be much cheaper than extracting every last cfm of flow (usually involves sectioning a spare head) and fitting bigger valves. Port finish is a contentious issue. Generally, a slightly rough finish is desired for street and track work. As Norbie has stated, this is probably less important with fuel injected cars and fuel being deposited so close to the inlet valve. The ultimate extension of this would be direct fuel injection (EGA 2JZFSE) where the fuel is injected directly into the cylinder. The need for fuel droplets to be kept in suspension here have been abolished, so a highly polished port finish would be ideal. I haven't seen any randomized controlled trials which demonstrate any difference in fuel suspension or any which show a difference in major end points (eg power/torque). One must remember the origins of this dogma - carbed engines of yesteryear. Nevertheless, polishing is generally only recommended for drag cars.....huge flows, wide open throttle, run for 4-10 seconds. [Report message to a moderator]

	Subject	Poster	Date
	Cost of porting&polishing and other engine work?	Stefan	Tue, 03 September 2002 13:40
	Re: Cost of porting&polishing and other engine work?	raSkaS	Tue, 03 September 2002 15:19
	Re: Cost of porting&polishing and other engine work?	mr supra	Wed, 04 September 2002 06:27
	Re: Cost of porting&polishing and other engine work?	raSkaS	Wed, 04 September 2002 16:22
	Re: Cost of porting&polishing and other engine work?	BigBadBenny	Wed, 04 September 2002 21:10
	Re: Cost of porting&polishing and other engine work?	GIN51E	Thu, 05 September 2002 04:32
	Re: Cost of porting&polishing and other engine work?	Celica_RA40	Wed, 04 September 2002 11:08
	Re: Cost of porting&polishing and other engine work?	M.W.P.	Thu, 05 September 2002 08:16
	Re: Cost of porting&polishing and other engine work?	Norbie	Thu, 05 September 2002 08:32
	Re: Cost of porting&polishing and other engine work?	Celica_RA40	Thu, 05 September 2002 12:16
	Re: Cost of porting&polishing and other engine work?	TE72_Turbo	Thu, 05 September 2002 12:41
	Re: Cost of porting&polishing and other engine work?	Gased	Thu, 05 September 2002 13:04
	Re: Cost of porting&polishing and other engine work?	Stefan	Thu, 05 September 2002 13:16
	Re: Cost of porting&polishing and other engine work?	Norbie	Thu, 05 September 2002 23:39
	Re: Cost of porting&polishing and other engine work?	gianttomato	Fri, 06 September 2002 01:20
	Re: Cost of porting&polishing and other engine work?	Youngy	Fri, 06 September 2002 02:33
	Re: Cost of porting&polishing and other engine work?	Norbie	Fri, 06 September 2002 03:35
	Re: Cost of porting&polishing and other engine work?	purpleminiep	Sat, 07 September 2002 14:11
	Re: Cost of porting&polishing and other engine work?	mrshin	Sat, 07 September 2002 14:18
	Re: Cost of porting&polishing and other engine work?	Bill Sherwood	Sun, 08 September 2002 01:23
	Re: Cost of porting&polishing and other engine work?	celicamad85	Sun, 08 September 2002 03:34
	Re: Cost of porting&polishing and other engine work?	GIN51E	Sun, 08 September 2002 04:30
	Re: Cost of porting&polishing and other engine work?	Bill Sherwood	Sun, 08 September 2002 06:36
	Re: Cost of porting&polishing and other engine work?	TE72_Turbo	Sun, 08 September 2002 09:24
	Re: Cost of porting&polishing and other engine work?	Sam	Sun, 08 September 2002 09:36
	Re: Cost of porting&polishing and other engine work?	GIN51E	Sun, 08 September 2002 10:43
	Re: Cost of porting&polishing and other engine work?	celicamad85	Sun, 08 September 2002 10:43
	Re: Cost of porting&polishing and other engine work?	Bill Sherwood	Sun, 08 September 2002 10:47
	Re: Cost of porting&polishing and other engine work?	celicamad85	Sun, 08 September 2002 11:00
	Re: Cost of porting&polishing and other engine work?	Celica_RA40	Sun, 08 September 2002 13:12
	Re: Cost of porting&polishing and other engine work?	allencr	Sun, 08 September 2002 13:38
	Re: Cost of porting&polishing and other engine work?	Youngy	Sun, 08 September 2002 18:39
	Re: Cost of porting&polishing and other engine work?	mrshin	Sun, 08 September 2002 22:25
	Re: Cost of porting&polishing and other engine work?	thetoyman75	Tue, 10 September 2002 04:22

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