Quote:
Originally Posted by gtofreek
The last time I used an Eagle cast crank, it was in an engine making around 600-650 HP. That engine ran great right up to the point where the crank broke in 3 pieces at the 3'rd rod journal back and split the block in two. All the bearings on that crank looked good, so it was just a matter of the Chinese cast iron couldn't hold the power. That was the last time I used one of those cranks. I just don't trust them anymore. I'm quit certain a factory crank would have held up just fine in that engine. This was back in the early 2000's when these cast Eagles were the only option before all the forged cranks came out. Maybe they have gotten better, I don't know. Never been willing to try another.
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Well THANKS PAUL !!. You just cost me a grand. The crank is one of the first ones that came out, its that old. All that was available back then. Paid 450 freaking dollars for it from Indian Adventures.
You know, I do have a crank that I was told it was steel. Its a Crankshaft Specialist crank I bought on E bay years ago. Its was .3.25 main 4.25 stroke. Had them turn it down to 3" main and weld the thrust and machine it, profile counterweights and gun drill. Its 65lbs now.
I can not certify what it is made of. This thing has square cheeks like a 455 crank. Not seen any forgings with that. It has a Crankshaft Specialist stamp on a counterweight but was turned off in the lathe for lightening.
I am a welder and the thrust was welded at CS and the guy who did the welding would know if he tried to weld on iron with wire/rod meant for steel. If he had to weld the cast iron that gets a little more tricky. But it was over 10 years ago. The whole crank is shiny as can be. Where they profiled counterweights it looks like chrome. Guy at CS said it resembled a billet but I doubt that is true. Have some pics, maybe I will post.
But at any rate, even if it is a fully prepped 455 turned down/welded crank, its better than a cast Eagle. I would think a PMD crank would do well at 650 HP.
I can not run that Eagle now. Take a chance of wasting a std bore 73 400 block with splayed billet caps, I don't think so. Whittmores last engine.
BTW, I remember Dan had the crank but never got around to rebalancing the whole thing before he passed. But said he had a "stroke checker" tool and said it was actually 4.23 stroke. Would I have to deck the block a bit lower if I run it ?
Sorry for the hyjack. Maybe I will start a thread on it. Buyng a new Scat forging would put my project past April, start of the season. If I can make the CS crank work (rebalance rotating assembly) that might make the best sense.