I'm very curious to see this new crank design that your speaking of. I hope they're getting good results.
Broken Crankshaft Count?
- Thread starter EDP
- Start date
We r pretty sure my brothers lmm is broke. Should have it out this weekend. The balancer can b wiggled around like jello. 198k 07.5
It is a "new" material, used in funny car, and has full round counterweights. Not designed to mimick or based exactly like a stock crank...
The "metal" has some flex capability and ability to be through hardened instead of surface hardened. Unlike the 4330M that others manufacture and others are selling.
Crankshaft broke on our 2007.5 LMM. My most recent post on here (I think I only have about 4 posts) was when we were trying to diagnose the problem and it has all the details of the new motor, etc. The crank breaking has everyone scratching their heads trying to figure out what happened and why.
Add another one to the list. 09 LMM farm truck. Stock other than deletes and towing tune from Rob. The owner said he was late for something and in a hurry driving it kinda hard and it started running terrible.
Man, carnage sucks...
Sorry to hear/see this guys luck, and I felt bad that I lol'd, but the pic of JB weld next to the broken crank is epic:roflmao:
What is causing these to break, does anyone have any new information they can share? (dampener) Also how can one try to avoid this, alt fire cam, no lock up box, etc...
Thank you
Thank you
I know the are lots of variables, but what is the most influencing part of the harmonics generated in our rotating assemblies?
I remember fingers saying that adding more weight on the nose of the crank would help the crank issues, shocker for sure.
. im sure your engine will be fine
Might be adding another the list. Going to pull my engine this week and tear it down I believe.
Went WOT on the race tune from 3rd through 5th, slowed down to 30mph or so to make sure it was out of 4wd and when I started to speed back up, had a terrible vibration. Balancer appears to be wobbling. Balance rates are good, but getiing a cylinder 1&2 misfire. Took converter bolts out to rule it out and the vibration is still there. Balancer key is still good. May get an oil analysis because I can't see any metal in it yet. Might swap some injectors around and do a compression test but I feel like I am pissing in the wind.
Anybody let me borrow a match?
Went WOT on the race tune from 3rd through 5th, slowed down to 30mph or so to make sure it was out of 4wd and when I started to speed back up, had a terrible vibration. Balancer appears to be wobbling. Balance rates are good, but getiing a cylinder 1&2 misfire. Took converter bolts out to rule it out and the vibration is still there. Balancer key is still good. May get an oil analysis because I can't see any metal in it yet. Might swap some injectors around and do a compression test but I feel like I am pissing in the wind.
Anybody let me borrow a match?
I haven't thrown in the towel just yet but all signs are pointing that way right now. Brand new LLY crank from GM with around 4,000 miles total on it too.
Just wondering for you guys that have bent/broke a crank. I drove it about 3miles home, ran for maybe 15min in the shop, and I can't see any signs of metal in the oil. I would think it should have been beating the mains out of it with that much run time.
