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      09-05-2010, 07:15 PM   #7
kenwelch
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Drives: 2008 E92 M3 M-DCT
Join Date: Dec 2006
Location: Mission Viejo, CA

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The dual clutches are “wet” design and hydraulically cooled. In the lower picture that I posted the yellow circled clutch unit is out of the transmission bell housing (clutch housing). When assembled it would be moved to the right inside the housing and engaged to the input shaft and the four sealing rings. The “exploded view” cut-a-way transmission has moved the clutch unit to the left for better viewing.

This is from the BMW introduction manual:

“GS7D36SG M double-clutch transmission features:
• Hydraulically operated double (wet) clutches.”

“The pressure required for the clutches is limited to 18 bar. The clutch is regulated by an integrated proportioning valve.
Overpressure protection is ensured by a pressure relief valve.
Clutch cooling is map-controlled using a proportional valve.”