Has anyone seen a failure like this? Small spot of porosity in the casting that failed under fatigue, it looks like. A small bop to the tire by another kart resulted in this.
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I remember seeing a few of these a few years back. I never saw one personally, but there were a few around. Is this an older kart? Or was it an old stock spindle? I’m wondering if you got one from a “bad batch” somehow.
The kart is a 2021, so not terribly old.
I have seen it on a cadet kart, probably of that era. What I saw on the other spindle that wasn’t broken was the lack of a fillet right where the spindle necked down. Lots of stress there.
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Holy smokes, I had the same failure last year on my 2018 Ricciardo. Snapped on the right side in practice, struggled to find a replacement, got on track, made it through the prefinal with a 25mm spindle, then 4 laps into the final, the left Freeline spindle snapped, exact same way. Probably cost me some positions in the overall points battle. I may have even posted pics in this forum about it. I’ll edit if I can find them.
In my instance, I couldn’t believe they both snapped within about 8 laps of each other.
Wow, literally the same failure. I’m replacing both as a precaution, and it looks like that’s a good idea!
Yep, there should be a fillet there.
I put some mgm spindles on. They did fine, way cheaper.
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Have seen more than 1, and we have only been karting 3 years (about 50-55 race weekends total).
There is a stress riser on the spindles from that era of manufacture due to a sharp radius step in the spindle. That is where the failures I saw all occurred. When you looked at the crack region on the couple I personally saw, you could see the Wallner lines and crack origin were clearly from the step in the shaft.