GT350 Flat-Plane Crankshaft Explained

Discussion in 'Drivetrain, Exhaust and Electrical' started by VoodooBoss, Nov 23, 2014.

  1. VoodooBoss

    VoodooBoss Rick Moderator

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    Not that the GT350 has been confirmed to include a flat-plane crank I'd like to learn more about it. The two main purposes for using such a design is to lighten the rotating mass and improve breathing. A FPC uses a lighter crank which allows the engine to rev up faster. The firing order allows a better flow from the exhaust ports. One negative is they typically have less torque. The GT350 will either have a 8,000 or 8,250 RPM rev limit depending on how you interpret this comment:

    "The new Ford spins to a heady 8000 rpm before fuel cut-off, according to Nair, and has another 250 rpm of safe headroom. This from mildly oversquare 94 x 92.7-mm bore and stroke dimensions."

    More can be read at the links below. Post up any insight or questions you may have.

    http://articles.sae.org/13709/

    https://www.youtube.com/watch?feature=player_detailpage&v=2AzrOPPZFzs

    http://www.projectm71.com/Cross_FlatPlane.htm

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  2. twistedneck

    twistedneck TMO Race

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    I thought you didn't need the heavy counter weights with the flat plane? but balance shafts were needed? still confused.

    Excellent schematics and animations.
     
  3. VoodooBoss

    VoodooBoss Rick Moderator

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    Most FPC engines are smaller displacement. Hopefully the added counterweights and crank are still lighter than the cranks in our engines.
     
  4. Fat Boss

    Fat Boss TMO Addict

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    Funny that Ford used the FPC's over a hundred years ago. ;D

    Model T crank.

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  5. VoodooBoss

    VoodooBoss Rick Moderator

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    GT350 Flat-Plane Crankshaft Explained Vintage Article

    This is from member Psg8064 who forwarded this to me for posting. It's a pretty cool read. I have the PDF but thought this might be easier for reading. Let me know if it's not. Click on the images to make them larger or download them.

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  6. ChopSui

    ChopSui Mike

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    Awesome, depleted uranium counterweights!
     
  7. VoodooBoss

    VoodooBoss Rick Moderator

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    Here's an interesting article on the FPC configuration Ford used. Not conventional and not light either. It will be interesting to see how it holds up to @cloud9 on track. ;D

    http://www.edmunds.com/ford/mustang/2015/long-term-road-test/2015-ford-mustang-gt-more-insights-on-the-gt350-voodoo-v8.html

    GT350

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    Porsche 918

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