Recent content by thomasfouraker

Seems like similar vintage crankshafts have 4340 stamped over the part number for forged components. With the second set of numbers likely being a time stamp.

You know, I guess that would make sense. Especially since this rotating assembly had Eagle I beams and Hypereutectic pistons. Would kinda jive a little more to have a cast crank with those other components. I will try to give Eagle a call tomorrow and inquire. I know the numbers are hard...

I did notice there was a crack on the snout underneath the damper. Likely a month before I pull the engine and tear it down but I am anxious to see what I find. Better start shopping for dampers…..

Aside from some marks as a result of interference with the water pump (assuming it occurred when the crankshaft became compromised and it wobbles) the damper looks fine to my eyes.

Thats interesting. They market that particular damper for mild street builds up to 400hp. It seemed like I fell within that and while this motor has had some WOT pulls while tuning, it never over 5000rpm or demonstrated any strange vibrations. Its in a 6500lb full size truck 2000 Ram 1500 4x4.

I will try and pull the motor in the next few weeks. Have to free up some engine stand space. This is the balancer I was using:

Is there any way Of checking is the damper is good or not?

95% sure it’s forged…….I vaguely remember the part number and confirming it was forged but it’s possible it’s not.

Great reply from an authority on the subject. I don’t think a forged crank should ever break under any circumstances on a build like this. Especially NA. I’d love a Molnar crank and may have to price out a rotating assembly.

Pro Race Balancer. I haven’t pulled the motor yet but hopefully within the next week or two I can have it broke down and inspected. Aside from component defect, any thing else I should be looking for as a contributor?

In full disclosure, this was a used crankshaft out of an engine that was put together in the early 2000s/late 90s. I did have it ground .10/.10 prior to using it. It was magnafluxed (supposedly) and fine.

Pictures

Built a 408 from a Magnum Platform a few years ago. Recently been running it and dialing in the tune and in doing so making some hard pulls. It was running really nicely then I noticed a knocking and a wobbly balancer. Of course I pulled the drain plug and found it full of metal. Pulled...

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