tcp_ML500 - 7/13/2004 9:08 PM
Storm. - 7/12/2004 3:03 AM
I love the concept of the W12 engine,.... even though it's just 2 VR6's joined together.
A V12 can also be considered as two banks of six cylinders, as two I-6's joined together at the crank.
The R in V"R"6 stands for Reihen, or in-line. The VR6 is a narrow angle V6 (15 degrees), so designed to get a compact block and thus fit under shorter hoods while retaining inherent stability of an in-line design. You give up a bit of stability going from an I design to a V design, but no nearly as much in the case of the VR6 as opposed to 90 deg. Vees found in MB's bread and butter M112 V6 or M113 V8 for instance.
For reference, MB has toyed with W8 and W12 designs in the 80s, although no production car was fitted with these. They even had designs called the U8, which had two cranksafts (the branches of the U) which then synchronized to rotate another shaft. The joining of the two shafts was the weak point of the design. They assumed that the stability of to I4s was desirable over the complication of the extra shafts, no market application for that one either...
As a side, I would not mind seeing a Wankel in an MB, much like the SL MB customized for Felix himself!
Was your comment made as relating to having three angles inherently designed into the W12, versus one on the V12. Two of for between the intrinsic I3 banks of each VR6 banks and one for the angle between the two VR6 banks?
Was it made as pertaining to nominal output of a VR6 bank versus I6 bank individually?