Manley Billet 100mm crank - Cracked
It's a pity what happened to the gentleman's crank. And comments above can escalate quickly. I personally know the shop named and can vouch for their work. That being said sometimes iiissshhh happens whether it be a faulty part or fault of the machine shop or builder. I think it happens at all shops to some degree. Hope the OP gets his beast up and running again with no issues.
And I don't know the shop so I left name out.
Yea it sounds more like he needs a driver mod. It'd be different if he was setting records regularly or something but blowing through that many different parts points to one common denominator.
Evolved Member
Joined: Mar 2014
Posts: 816
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From: wisconsin
My opinion is if that crank would have had a little attention before installation it would not have cracked.
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Joined: Mar 2014
Posts: 816
Likes: 82
From: wisconsin
https://www.summitracing.com/parts/c...SABEgI7ePD_BwE
look familiar? It’s probably the same part from China just finished by callies.
look familiar? It’s probably the same part from China just finished by callies.
https://www.summitracing.com/parts/c...SABEgI7ePD_BwE
look familiar? It’s probably the same part from China just finished by callies.
look familiar? It’s probably the same part from China just finished by callies.
Evolved Member
Joined: Mar 2014
Posts: 816
Likes: 82
From: wisconsin
I was looking at their compstar cranks. The one you posted is their sport series it seems. I have no idea what the difference is driving that cost.
Edit: maybe not, I have no idea why there's two part numbers.
Edit: maybe not, I have no idea why there's two part numbers.
So as a brief tech point, we have broken every crank made in every stroke at some point. Power or oil starvation, rpm/vibration, you can pick the poison. The Manley cranks break the most and it doesnt matter what material it is we have had six 100mm cranks, 2 88mm cranks, and 2 of them were the Billet. We were told "Never seen that before" when we sent a pallet of them in. We micro fractured a 94mm Winberg as a result of a 1-2-1 dogbox issue where normally a crank is the last thing that would have an issue. The only time we see issues is above 1100whp or in endurance racing. The only Eagle to ever break had a long history at 700whp on a pump meth setup, survived two mis shift events and one was violent enough to break an H beam. It took 10 years before it broke and it broke at 600whp on a big turbo on E85 and even then I feel it was driver error...again. Each manufacturer has slightly different method to their oiling, chamfer on the counterweight area and oiling holes, all things that make them unique. All of them strive to improve their product but I doubt anyone that has made power hasnt seen one break, whether they talk about it or not is an entirely different matter. I would never make judgement of quality based on X has run yyy amount and never seen a problem. Chances are they have and you just dont know about it.
Thanks Sean. If that block venting day ever occurs, been looking at the ER2.2L Street short block w/the Eagle crank (sounds like the Eagle forging has some benefits over some of these billets)
RS Motors has gone through enough Manleys to change their minds
RS Motors has gone through enough Manleys to change their minds