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oldcorollas Forums Junkie Location: Kita-Ku, Sapporo, Japan Registered: January 2003	Re: Strength of W58 gearbox Sun, 08 February 2004 14:33 theoretically? (for conclusion, scroll down) imho, most ppl will dump the clutch once or twice, if not more often. the shock loading at the base of the teeth while doing this is what kill sprobably 95+% of boxes. it takes only a SINGLE over-load event to initiate a crack at the base of the tooth, usually starting from machining marks. the hardest thing is to get the crack started. once it has started, all it takes is either a few more overloads, or just lots of high load cycles from spirited driving (ie not clutch dumps or flat changes), and the teeth will break off. bearings are immensely strong! check out the load ratings of the bearings of the size used in gearboxes. i would be guessing they can take a tonne or two of force, which is more than will be generated by the gears pushing each other away. while it's tru that steel will have a higher tensile strength than alloy, the difference may not be that huge relative to the magnitude of loads we are talking about here. i'd venture a guss that the alloy has a tensile strength of around 100-300MPa, and the steel maybe 300-500MPa. to cause the shafts to move further away from each other by elastically deforming the snadwich plate i think is unlikely (but possible?) i do think you would have more luck bending the shafts tho. again, this is more likely to cause a tooth overload situation due to 'not nice' loading angles on the teeth when the shaft bends... anyway, i'd love to see some pictures of broken gearboxes (WIFTT ). for reference, here's a tooth of one of my K boxes. the tooth has cracked almost halfway thru by fatigue before finally breaking!! all due to flatchanging so, the moral of the story is: if you treat the gearbox bad, even once, you can drastically shorten it's life, even in low power situations. if you are nice to it, it will last a lot longer. if you really want to make it last, get a set of dogbox gears made Cya, Stewart [Report message to a moderator]

	Subject	Poster	Date
	Strength of W58 gearbox	speedjunky	Wed, 15 May 2002 10:19
	Re: Strength of W58 gearbox	gianttomato	Wed, 15 May 2002 10:59
	Re: Strength of W58 gearbox	rob_RA40	Wed, 15 May 2002 11:58
	Re: Strength of W58 gearbox	justcallmefrank	Wed, 15 May 2002 12:06
	Re: Strength of W58 gearbox	kevz0r	Wed, 15 May 2002 14:00
	Re: Strength of W58 gearbox	willwal98	Wed, 15 May 2002 14:21
	Re: Strength of W58 gearbox	gianttomato	Wed, 15 May 2002 22:49
	Re: Strength of W58 gearbox	Darren	Wed, 15 May 2002 23:55
	Re: Strength of W58 gearbox	thetoyman75	Thu, 16 May 2002 03:01
	Re: Strength of W58 gearbox	gianttomato	Thu, 16 May 2002 03:36
	Re: Strength of W58 gearbox	thetoyman75	Thu, 16 May 2002 04:01
	Re: Strength of W58 gearbox	speedjunky	Thu, 16 May 2002 08:12
	Re: Strength of W58 gearbox	Edgy	Thu, 16 May 2002 09:01
	Re: Strength of W58 gearbox	Edgy	Thu, 16 May 2002 09:08
	Re: Strength of W58 gearbox	HooN	Sat, 18 May 2002 07:00
	Re: Strength of W58 gearbox	Qorky	Sat, 18 May 2002 10:38
	Re: Strength of W58 gearbox	celica_freak	Sun, 02 June 2002 16:17
	Re: Strength of W58 gearbox	justcallmefrank	Mon, 03 June 2002 01:15
	Re: Strength of W58 gearbox	Stefan	Mon, 03 June 2002 01:30
	Re: Strength of W58 gearbox	justcallmefrank	Mon, 03 June 2002 02:03
	Re: Strength of W58 gearbox	justcallmefrank	Sun, 08 February 2004 00:26
	Re: Strength of W58 gearbox	wil8115	Tue, 09 March 2004 09:08
	Re: Strength of W58 gearbox	justcallmefrank	Sun, 08 February 2004 13:54
	Re: Strength of W58 gearbox	ed_ma61	Sun, 08 February 2004 14:01
	Re: Strength of W58 gearbox	justcallmefrank	Sun, 08 February 2004 14:06
	Re: Strength of W58 gearbox	ed_ma61	Sun, 08 February 2004 14:07
	Re: Strength of W58 gearbox	justcallmefrank	Sun, 08 February 2004 14:10
	Re: Strength of W58 gearbox	ed_ma61	Sun, 08 February 2004 14:28
	Re: Strength of W58 gearbox	oldcorollas	Sun, 08 February 2004 14:33
	Re: Strength of W58 gearbox	justcallmefrank	Sun, 08 February 2004 14:31
	Re: Strength of W58 gearbox	ed_ma61	Sun, 08 February 2004 14:37
	Re: Strength of W58 gearbox	oldcorollas	Sun, 08 February 2004 14:52
	Re: Strength of W58 gearbox	justcallmefrank	Sun, 08 February 2004 14:55
	Re: Strength of W58 gearbox	ed_ma61	Sun, 08 February 2004 14:58
	Re: Strength of W58 gearbox	oldcorollas	Sun, 08 February 2004 15:03
	Re: Strength of W58 gearbox	Norbie	Sun, 08 February 2004 23:57
	Re: Strength of W58 gearbox	justcallmefrank	Mon, 09 February 2004 00:19
	Re: Strength of W58 gearbox	Norbie	Mon, 09 February 2004 08:50
	Re: Strength of W58 gearbox	ed_ma61	Mon, 09 February 2004 13:53
	Re: Strength of W58 gearbox	Sam_Q	Wed, 14 April 2004 12:51
	Re: Strength of W58 gearbox	dispatcher	Wed, 14 April 2004 14:27
	Re: Strength of W58 gearbox	CrUZsida	Wed, 14 April 2004 15:18
	Re: Strength of W58 gearbox	wil8115	Wed, 14 April 2004 19:33
	Re: Strength of W58 gearbox	Sam_Q	Thu, 17 June 2004 12:04
	Re: Strength of W58 gearbox	wil8115	Thu, 17 June 2004 22:48
	Re: Strength of W58 gearbox	toynado	Fri, 18 June 2004 19:02
	Re: Strength of W58 gearbox	wil8115	Fri, 18 June 2004 20:38
	Re: Strength of W58 gearbox	Barney	Mon, 21 June 2004 11:47
	Re: Strength of W58 gearbox	justcallmefrank	Mon, 21 June 2004 11:53
	Re: Strength of W58 gearbox	justcallmefrank	Thu, 17 June 2004 12:17
	Re: Strength of W58 gearbox	Sam_Q	Thu, 17 June 2004 12:21
	Re: Strength of W58 gearbox	justcallmefrank	Thu, 17 June 2004 12:23
	Re: Strength of W58 gearbox	V8_MA61	Thu, 17 June 2004 12:27
	Re: Strength of W58 gearbox	justcallmefrank	Thu, 17 June 2004 12:30
	Re: Strength of W58 gearbox	V8_MA61	Thu, 17 June 2004 12:32
	Re: Strength of W58 gearbox	Sam_Q	Thu, 17 June 2004 12:37
	Re: Strength of W58 gearbox	V8_MA61	Thu, 17 June 2004 12:41
	Re: Strength of W58 gearbox	Sam_Q	Thu, 17 June 2004 12:43
	Re: Strength of W58 gearbox	fade-e	Thu, 17 June 2004 13:28
	Re: Strength of W58 gearbox	V8_MA61	Mon, 21 June 2004 12:04
	Re: Strength of W58 gearbox	Kingswood	Tue, 22 June 2004 10:40

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