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Re: Mine have the ridge, too (archive)
[ Follow Ups ] [ 7-series (E32) Message Board ] [ Msg. Board FAQ ]
Posted by Rick Stillwell on April 29, 2001 at 21:10:40:

In Reply to: Good advice... posted by Mark in SBA on April 29, 2001 at 20:14:42:

Mark:

My gaskets or spacers have the ridge, too, so they must have been already replaced. They look to be in too good a condition for 122K miles.

I think you're exactly correct on decoupling as the reason for isolating the intake manifold from the engine. I hadn't thought of that, but the intakes are rather large cantilevered structures off the head.

Do you have a manual transmission on that 850i?

Rick.


Rick,

I've just removed my 80K "spacers" (BMW's nomenclature) this afternoon and they were a mess - lots of tiny hairline cracks around the periphery of the inside. You can be sure I'll be using Hylomar when it comes time to button it all back up.

Also, I noticed the new spacer contains a ridge, whereas the original that came with the car did no. Could this be a new and improved gasket?

I think the reason the intake manifold and head are not joined directly is due to the tuned mass the manifold creates - that's a lot of weight to cantilever off the head. Apparently the spacers (or gaskets) decouple the head and the manifold to eliminate certain resonances.

Read that is some BMW technical brochure a while back.

Mark
92 850i




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