So I am putting my motor to gather and I want to know has anyone here ever broken a stock crankshaft in a 4.6 2v/4v? And if so at what HP where you at?
4.6 2V
- Thread starter V8 Ford Ranger
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I haven't heard of a stock crank breaking in a 2v but I'm sure its very possible if you are pushing a lot of power (450-500) and reving to 7k-7.5k. If you feel the need to buy one to support the power, get a cobra crankshaft. Mine is from a 2001 and from what I understand the cobra crankshafts are forged steel and also changes the flywheel bolt pattern from 6 bolts to 8 so you would need a new flywheel. But they hold the power all day long up to 800hp
I was wondering the exact same thing a while ago and could not find anyone that broke a stock cast crank. I think because many people just swap it out to the forged crank once they are building the engine.
However, you can do a budget build now with the oem coyote rods and a decent forged piston. My plan is to use the stock cast crank with these parts and push to around 600rwhp. I think if the rpms are held down to a reasonable level (6,500), the engine should live.
However, you can do a budget build now with the oem coyote rods and a decent forged piston. My plan is to use the stock cast crank with these parts and push to around 600rwhp. I think if the rpms are held down to a reasonable level (6,500), the engine should live.
The safe limit of the cast crank has been debated for a long time and there are next to no failures out there. The limit is believed to be 600 but honestly there are people out there running them at 700 rwhp. There is an old post on modfords stating that someone (I want to say ford racing) took a stock 3V crankshaft to 800 with a whipple and the crank itself didn't really fail but the snout broke due to the belt tension and strain of driving the blower. I think the stock crank is a lot stronger then we think and for most of us they are just fine. I am actually running one in my build shooting for minimum 500 at the wheels and have NO concerns of breaking it because I know it will hold.
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In regards to power and RPM with a stock crank most tuners raise the rev limiter to 6500-6700 when you add a supercharger on the stock internals. My car was tuned like this and I always shifted my car at 6500 without an issue, stock engine. The factory balancing tolerances on these engines is a little wide so with proper balancing on the rotating assembly I don't see why 7000 rpms wouldn't be a problem honestly.
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