GT350 to start at $53,000? - Page 2 - Ford Mustang Forum
 
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F91
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And POOF!!!! Magically, Dodge Challenger posts have disappeared (well, for my view anyway).


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can anyone describe a "flat plane crank" ; what is "flat plane" about it, why is it different or better?

thanks!


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If you laid a flat plane crank on a table, it would lay flat.

Per Wikipedia:

The flat-plane or single-plane crankshaft has crank pins at 180. As they always move two pistons together, the Secondary Vibration is twice as strong (and half as frequent) as cross-plane, unless balance shafts are used, with a counter rotating pair flanking the crankshaft transverse to the crankshaft centreline. As it has nearly perfect plane balance,[16] it does not normally require counterweights. The crankshaft with less mass and thus inertia allows quicker revving up and down, in addition to the firing being LRLRLRLR or RLRLRLRL with regular overall and per-bank pulse spacings for uniform combustion without requiring a complicated exhaust system. The design was popularized in modern racing by the Coventry Climax FWMV 1.5 L (92 cu in) V8 that evolved from a cross-plane to a flat-plane configuration (with longer conrods). Flat-plane V8s on road cars come from Ferrari (every V8 model they have ever made, from the 1973 308 GT4, to the new 458), Lotus (the Esprit V8), TVR (the Speed Eight), Porsche 918 Spyder, McLaren (the MP4-12C), as well as Ford (the Mustang Shelby GT350). This design is popular in racing engines, the most famous example being the Cosworth DFV.[17]

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post #19 of 24 (permalink) Old 12-08-2014 Thread Starter
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post #20 of 24 (permalink) Old 12-08-2014 Thread Starter
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You figured GM would have made Vette engine top of the line with flat plane V8. I like it that Ford beat them to it for GT350
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Quote:
Originally Posted by pdmustgt View Post
You figured GM would have made Vette engine top of the line with flat plane V8. I like it that Ford beat them to it for GT350
The "flat plane" engine is harder to "balance" (remove vibration) then the "cross plane" engine. The bigger the displacement, the more difficult the task. The Corvette has generally used high displacement engines to generate high torque numbers. The cross plane engine typically creates more horsepower at higher then usual RPM but doesn't generate the big torque numbers because the displacement is usually smaller.

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Yes I know that about balancing issues.
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Thanks for the edumucation guys!

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