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Old 08-08-2006, 10:13 AM   #15
beem

Name: beem
Title: Senior Member
Status: Offline
Join Date: Apr 2005
Location: SW MI
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Your Ride: '00 540/6 Dinan S2(sold), '90 525i/5, '01 Audi S4
hey accordring to wikipedia:

General Motors patented the first variable valve timing and lift or smart valve system in September of 1975. GM was interested in throttling the intake valves in order to reduce emissions. This was done by minimizing the amount of lift at low load to keep the intake velocity higher, thereby atomizing the intake charge. GM encountered problems running at very low lift, and abandoned the project.
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