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mrshin Forums Junkie Location: Montrose, VIC Registered: May 2002	Re: Shim over, Bucket over? Difference? Sat, 15 February 2003 11:33 Shim under/shim over is relevant in a DOHC setup where the camshaft is directly over the top of the valve e.g. 4ag, etc, etc(NOT SR20!). On the top of the valve there is a thing called a bucket (look at it and it's obvious why) that goes betweek the end of the valve stem and the camshaft. The shims are needed to adjust valve clearance (the gap betweek the base of the cam and the bucket). The difference is that with shim over (e.g. 4ag standard), the shims are on the top of the bucket, whereas shim under puts the shims underneath the bucket. In a standard engine you're not going to gain anything by converting to shim under, but when you start increasing the cams/revs dramatically, then there is potential for the shims on top of the buckets to become dislodged at big revs, causing big damage. Shim under is a way of fixing this. [Report message to a moderator]

	Subject	Poster	Date
	Shim over, Bucket over? Difference?	wilbo666	Sat, 15 February 2003 11:15
	Re: Shim over, Bucket over? Difference?	mrshin	Sat, 15 February 2003 11:33
	Re: Shim over, Bucket over? Difference?	gianttomato	Sat, 15 February 2003 11:37
	Re: Shim over, Bucket over? Difference?	SPEEDCORE	Sat, 15 February 2003 11:53
	Re: Shim over, Bucket over? Difference?	gianttomato	Sat, 15 February 2003 11:59
	Re: Shim over, Bucket over? Difference?	mrshin	Sat, 15 February 2003 12:26
	Re: Shim over, Bucket over? Difference?	SPEEDCORE	Sat, 15 February 2003 12:32
	Re: Shim over, Bucket over? Difference?	gianttomato	Sat, 15 February 2003 12:43
	Re: Shim over, Bucket over? Difference?	mrshin	Sat, 15 February 2003 12:43
	Re: Shim over, Bucket over? Difference?	SPEEDCORE	Sat, 15 February 2003 13:00
	Re: Shim over, Bucket over? Difference?	gianttomato	Sat, 15 February 2003 14:35
	Re: Shim over, Bucket over? Difference?	wilbo666	Sat, 15 February 2003 14:17
	Re: Shim over, Bucket over? Difference?	ed_ma61	Sat, 15 February 2003 15:05
	Re: Shim over, Bucket over? Difference?	gianttomato	Sat, 15 February 2003 15:08
	Re: Shim over, Bucket over? Difference?	IRA11Y	Sun, 16 February 2003 06:04
	Re: Shim over, Bucket over? Difference?	wilbo666	Sun, 16 February 2003 06:05
	Re: Shim over, Bucket over? Difference?	gianttomato	Sun, 16 February 2003 06:15
	Re: Shim over, Bucket over? Difference?	wilbo666	Sun, 16 February 2003 06:16
	Re: Shim over, Bucket over? Difference?	gianttomato	Sun, 16 February 2003 06:20
	Re: Shim over, Bucket over? Difference?	wilbo666	Sun, 16 February 2003 06:31
	Re: Shim over, Bucket over? Difference?	gianttomato	Sun, 16 February 2003 06:39
	Re: Shim over, Bucket over? Difference?	wilbo666	Sun, 16 February 2003 07:33
	Re: Shim over, Bucket over? Difference?	gianttomato	Sun, 16 February 2003 08:01
	Re: Shim over, Bucket over? Difference?	clubagreenie	Mon, 17 February 2003 07:01

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