Thread: Eeeewww!
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  #54  
Old 12-08-2011, 03:26 PM
bobdmac bobdmac is offline
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Location: Back in Oaktown, Yay Area
 
Join Date: Feb 2011
Posts: 2,500
Mein Auto: 2001 540i/6, '90 BMW k75s
Also, 540Alex and I learned that lapping the valves doesn't give as good a seal as using a poly crystal diamond cutting resurfacer that a top-notch machine shop would use. As it was explained to us, this cutter leaves the chamber so airtight that if you used a felt-tip marker on the valve seat, it would make the seal less effective.
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BMW--giving new meaning to the phrase "disposable income."
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