Nightmare fuel for the crankhub "fix" gang

[Slow M3]

Long story short Tim had to get his engine stripped down due to an issue with the timing chain guides.

During the tear down and inspection the shop discovered the 4 pin crankhub “fix” was on the verge of catastrophic failure. 3 of the 4 pins snapped off so he was essentially running his engine on borrowed time.

I guess the lesson here is to be careful where you buy these crankhubs from and also not because you have this so called fix means you’re bulletproof. Like everything out there you have garbage products being passed off as just as good.

Skip to 7:05 if you don’t have the patience to sit through the back story.

[Vantablack]

Well I guess I ain't getting any sleep tonight....

I have a 4-pin crankhub in my M4

[Innovade]

I've been seeing this more and more lately. I've always thought the VTT crankhub was the best solution since it distributes the load evenly across the crank rather than a few small pins.

[Sndmem3s]

Video isn’t working for me

what brand CH is it?

[greysea]

Originally Posted by Sndmem3s

Video isn’t working for me

what brand CH is it?

Insane performance 4 pin CH


Same one I have and waiting to install. Could be just a one off. I am still going to do it.

[NaptownBimmer]

I also have a 4 pin crank hub, but its the SSR one. Praying that it holds up. I dont think I've heard of any SSR hubs failing, but of course anything is possible. I also cant believe his engine needed a whole timing system refresh with a little over 100k miles! I have a 335 with an N54 with close to 260k miles with no timing issues whatsoever

[NaptownBimmer]

Originally Posted by Innovade

I've been seeing this more and more lately. I've always thought the VTT crankhub was the best solution since it distributes the load evenly across the crank rather than a few small pins.

Is there a specific brand this has been happening with? Or is it across the board?

[M3 SRRY]

Originally Posted by NaptownBimmer

Is there a specific brand this has been happening with? Or is it across the board?

I would like to assume it’s due to a bad installation. Inexperienced shop doing a crankhub install and possibly drilling the holes inaccurately, but that’s speculation.

I wonder what people think about the precision dynamics hub;
https://precisiondynamicsms.com/prod...yway-crank-hub

- skip to 36:50

Mike from Precision Dynamics explains in this video with Spencer Berke about how the dowel pins can shear off if improperly installed. He also explains his design and how it offers another side to the CH solution.

[Sndmem3s]

Let’s just delete this whole thread and not do this

[sdhasher21]

Originally Posted by Innovade

I've been seeing this more and more lately. I've always thought the VTT crankhub was the best solution since it distributes the load evenly across the crank rather than a few small pins.

Felt the same when looking at options. Ended getting the v2 installed with a cbc.

[Vantablack]

Originally Posted by M3 SRRY

I would like to assume it’s due to a bad installation. Inexperienced shop doing a crankhub install and possibly drilling the holes inaccurately, but that’s speculation.

I wonder what people think about the precision dynamics hub;
https://precisiondynamicsms.com/prod...yway-crank-hub

- skip to 36:50

Mike from Precision Dynamics explains in this video with Spencer Berke about how the dowel pins can shear off if improperly installed. He also explains his design and how it offers another side to the CH solution.

My Precision Dynamics crankhub failed! It was installed by the previous owner and it was shearing my timing chain. I think it was due to improper installation, but I'll never truly know.

[MaxOctane]

Originally Posted by Vantablack

My Precision Dynamics crankhub failed! It was installed by the previous owner and it was shearing my timing chain. I think it was due to improper installation, but I'll never truly know.

Precision Dynamics is keyed, and doesn't use 2/4 pins like most others and its supposed to have higher sheer strength. It must have been installed incorrectly, though not sure what "shearing your timing" chain means, that makes no sense. How long did it go before it failed? What happened when it failed? Did it nuke the valvetrain?

[Vantablack]

Originally Posted by MaxOctane

Precision Dynamics is keyed, and doesn't use 2/4 pins like most others and its supposed to have higher sheer strength. It must have been installed incorrectly, though not sure what "shearing your timing" chain means, that makes no sense. How long did it go before it failed? What happened when it failed? Did it nuke the valvetrain?

This is my car in the video. The teeth on the crankhub were starting to show premature wear and it was tearing into the timing chain.

It probably was improper installation, but that crankhub was in my car installed from the previous owner. A shop I took my car to actually found the Precision crankhub while they were trying to install me one (because I did not know I had one).

The joys of buying a used M-car

[Slow M3]

Originally Posted by Sndmem3s

Let’s just delete this whole thread and not do this

You can act like it’s not a problem but it’s not going to change the fact it’s a potential issue if you get a shitty crankhub or a shitty installer.

My biggest fear with getting that invasive of a mod done is you can’t periodically check it to make sure everything is all good. You won’t know until a catastrophic failure. This guy got lucky many others will only live in ignorance until all their pins shear off.

The fact that we complain about the stock friction ring but trust our engine with 4 tiny pins absorbing all the torque is pretty funny TBH.

[Sndmem3s]

Originally Posted by Slow M3

You can act like it’s not a problem but it’s not going to change the fact it’s a potential issue if you get a shitty crankhub or a shitty installer.

My biggest fear with getting that invasive of a mod done is you can’t periodically check it to make sure everything is all good. You won’t know until a catastrophic failure. This guy got lucky many others will only live in ignorance until all their pins shear off.

The fact that we complain about the stock friction ring but trust our engine with 4 tiny pins absorbing all the torque is pretty funny TBH.

Was mostly joking. I get it

If stock crank hub failure was sub 1%, hopefully upgraded CH failure is a fraction of that. Drive your cars

[NSX2M4]

Man, some people really tear the fuck out of this motor due to what, "could happen". Support your tuner shop today!

[Slow M3]

Originally Posted by NSX2M4

Man, some people really tear the fuck out of this motor due to what, "could happen". Support your tuner shop today!

Bro, I can totally make your engine way more reliable from a failure based on anecdotal evidence. You just need to trust me to tear it apart, drill into it, and swap the OEM part for some mystery metal from who knows where. And hey, it’s a steal at just $4,500.

[NSX2M4]

Originally Posted by Slow M3

Bro, I can totally make your engine way more reliable from a failure based on anecdotal evidence. You just need to trust me to tear it apart, drill into it, and swap the OEM part for some mystery metal from who knows where. And hey, it’s a steal at just $4,500.

No doubt, no doubt. Repeat customers for sure.