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What exactly is a W12 Engine?

Discussion in 'General Automotive Discussion' started by bmwmpower48, May 7, 2004.

  1. bmwmpower48

    bmwmpower48 Rookie

    Mar 8, 2004
    33
    Greensboro, NC
    Full Name:
    Josh Kinard
    I have heard it is two VR6 15 degree blocks welded together at a 72 degree angle, but does anyone have a more accurate description or a cross section, because I still don't see how that would work.
     
  2. Steve Magnusson

    Steve Magnusson F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    18,730
    Texas
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    Steve Magnusson
  3. Mitch Alsup

    Mitch Alsup F1 Veteran

    Nov 4, 2003
    6,502
    Here is a picture of one head. Notice how much shorter it is by not having all the cylinders in a straight line.

    15 degrees represents the misalignedness in one head, while 72 degrees is the angulation between banks of 6 offset center cylinders.
     
  4. Z0RR0

    Z0RR0 F1 Rookie

    Apr 11, 2004
    3,445
    Montreal, Canada
    Full Name:
    Julien
    Doesn't get much clearer than "2 VR6s" to me. The picture above is a VR6. Basically, it takes a lot less room than an online 6, but somewhat maintains the quality of the inline 6. Now picture 2 VR6s, both on the same crank. Basically like a V12, but the cylinder are squished like in the picture above, to make for a more compact engine, and more engineering headaches. :D

    edit : here are some W12 pics ... can't find a good cutaway ...

    http://www.***************.com/forum/attachment.php?attachmentid=15044

    http://www.***************.com/forum/attachment.php?attachmentid=15052

    http://www.newspress.co.uk/np12p/audi/a8/a8_6_0_w12.jpg

    http://www.valueparts.com.tw/database/tech/image/W12_1.jpg

    http://www.valueparts.com.tw/database/tech/image/W12_2.jpg

    VR6 engine : http://www.valueparts.com.tw/database/tech/image/VR6_1.jpg
     
  5. Mitch Alsup

    Mitch Alsup F1 Veteran

    Nov 4, 2003
    6,502
    In this listing the V8 crankshaft is a 90 degree (sometimes called a 360 degree) crank for Americal-like V8 engines. The flat plane crank of Ferrari engines is more similar to the W6 crank in its webing and balance weight system.
     
  6. PSk

    PSk F1 World Champ

    Nov 20, 2002
    17,673
    Tauranga, NZ
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    Pete
    The use of narrow angled V's is definitely not a VW invention as Lancia used it many moons ago with their v4's. They even had just one cylinder head (not sure about the VW engine) that went right across.

    Pete
     
  7. Sfumato

    Sfumato F1 Veteran
    Rossa Subscribed

    Nov 1, 2003
    9,625
    Llanfairpwllgwyngyll, Anglesey, Wales
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    Angus Podgorney
    #7 Sfumato, May 9, 2004
    Last edited by a moderator: Sep 7, 2017

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