Wills rings

[Charles]

On Fri, 12 Jan 2001 01:00:12 -0800, you wrote:

>> What's a Wills ring?
>
>Inert gas filled hollow ring set in a machined circumferential groove
>around the liners. Usually a stainless steel ring. This ring provides
>the combustion gas seal, a soft gasket around the head to block mating
>seals oil and water ways. A plain round section wire ring is more
>common, the Wills ring is better, but a lot more expensive

	You aren't kidding... my BMW 745i (factory turbo) uses
these rings to seal the cast iron exhaust manifold to the
alloy head, and a large one between the turbo and the
manifold flange. They have been extremely reliable despite
increased (15 psi) boost and short term exhaust temps of
1650 F. Unfortunately the head gasket does not use them and
I blew one while tuning at high boost (pinged a few too many
times).
	But the complete teardown gasket set is about $350
whereas the non-turbo set is $100 (and they are virtually
identical otherwise).
-Charles


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