Flat Plane Crank LT5

[XfireZ51]

Excellent article on the Voodoo.

[A26B]

Originally Posted by Jagdpanzer

Jerry,
Another excellent example of support for the LT5 ZR-1 brotherhood!!
How was Moldex to work with and what was their lead time to design and produce the crank?

Moldex was great to work with. Modified the damper bolt threads to a more common metric, without issue. Made to lightest possible weight, balanced to bob weight specs provided for rod/pistons used. Nitrided, same journal specs

Lead time was estimated at 12 weeks but ended up being 18 weeks between deposit & final payments.

I wouldn't hesitate doing business with them again.

[tpepmeie]

What's the bore x stroke on this engine? Anybody know?

[Jagdpanzer]

Originally Posted by A26B

Modified the damper bolt threads to a more common metric, without issue.

Excellent improvement to the LT5 crankshaft design.
I always wondered what must have been going through their heads when they decided to go with the M16x1.0 damper bolt lash-up instead of something more practical and readily available like M16x1.5.

[ZRapid-1]

Crossplane Crankshaft


Flat Plane Crankshaft


The Bottom Line

Crossplane Crankshaft Advantages: Smooth, vibration-free performance; distinctive American muscle car burble.
Crossplane Crankshaft Disadvantages: Heavier (harder to rev), requires larger crankcase.

Flat Plane Crankshaft Advantages: Lighter, more compact, more responsive (high-revving), better exhaust scavenging.
Flat Plane Crankshaft Disadvantages: Prone to vibration, lower torque levels.


Good video showing how the pistons move relative to each other:
https://www.youtube.com/watch?v=2AzrOPPZFzs
(Should have added exhaust sounds instead of music in the video.)

[5ABI VT]

Very cool!! Is the owner on here ? Wondering if he would mind me sharing those pics . How much power did it make ? That flywheel looks awesome !

Interesting note.. While I understand the pros/cons of the flatplane crank.. I applaud ford for their marketing scheme with the gt350. I'm a fan of different and unique and I do like the sound from the voodoo engine (I have a 15 GT with the coyote and it sounds HORRIBLE compared to my zr1s LT5). What I find interesting is Yamaha when introducing the new R1 in the early 2000s.. Actually came with a cross plane crank and they hyped that up and it's advantages on release big time.. Just like ford has done with the fpc in the gt350

[5ABI VT]

I still have the mag here's a pic.. The 'astounding' cross plane crank

[mgbrv8]

Here is some more screaming flat plane LT5 music


https://www.facebook.com/holger.hove...2992382110799/

Dave

[Hog]

The cool part starts at about 1:15. Explains the difference between the flat-plane Shelby GT350 5.2 liter "Voodoo" engine with 526hp@7500rpm and 429lb/ft torque@4750rpm, 8250rpm redline, with 12.0:1 compression, and the standard GT "Coyote" engine 435hp@6500rpm/400lb/ft torque@4250rpm with 11.0:1 compression(and every other conventional cross-plane V8 engine)
The drummer really helps visualize and audiolize what's going on.

http://www.youtube.com/watch?v=GbbNlkP-ZSM

On a street vehicle this amounts to a foundation for marketing hype and bragging rights.

[mgbrv8]

Extended footage. I hope the smoke is just crank case breather

https://m.youtube.com/watch?v=fI9vgjb5j5k&feature=share

Dave Hetrick