broken crank

[Peter]

Which comes first, a broken crank or spun main bearings? On the way back from Nats, about 200 miles from home, the crank broke and rod bolts started hitting the block. Very loud! Pulled the pan and noticed a badly spun main bearing.
Now that I have the engine out, I see the crank is broke between the center mains.
So, can spinning the center two main bearings cause the crank to break? Or is it more likely the crank (with 165k on it) cracked, probably at Bandimere, and broke on the way home? I had some strange knock retard at Bandimere that I had never seen before on E85.
Peter

 

[Poconojoe]

Re: broken crank

The broken crank most likely spun the bearings

 

[blacktyaffair]

Re: broken crank

I think the 12 passes at Bandimere came first!

Sorry Peter, had to say it. I'm sure you won't have any trouble getting her back together. I loved your ty at Nats, one of my favorites. Hard to believe it had 160k+ miles. What are the plans for the engine now?

 

[Peter]

Re: broken crank

Since the rods, pistons, cam, etc. only have 6000 miles on them, I'm going to try to save the block by converting to 4 bolt mains, since it needs line boring anyway. Hope that cleans up the damage from the spun bearings. I at least need to find a crank. Anybody have a good lead or advice?

 

[Sportmachines]

Re: broken crank

We have a half dozen or so stock cranks available. Get in touch.

 

[Don W.]

Re: broken crank

And I have a used stock (std.) crank for sale.