Technical Crank hub upgrade options

RuskiRacer

Captain
Jul 17, 2019
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2009 e93 335i
Spun my oem crank hub bolt out on my build bottom end build, had 4 people in the pig of a e93 when it happened didn't sound to good. Looking for options and feedback from people who are actually running upgraded crank hub solutions
 

JohnDaviz

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Jan 6, 2019
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335i E92 DCT
i´d be interested in the consensus of the upgraded OEM crank hub assembly. Since that one came out i have the feeling that the crank hub spinning was eliminated. But it is of course hard to tell with so few available data to judge the situation based on statistical available data.
 

RuskiRacer

Captain
Jul 17, 2019
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2009 e93 335i
Yeah I have a couple pictures I can drop later to kinda show what happened to the oem 3 piece hub assembly when it spins and the bolt backs out. I'm now going to a 1 piece pinned crank hub so we will see how it does
 

135i2

Specialist
Jul 23, 2017
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Pure Performance Motorsport - Melbourne, Australia.


I run of these in my built engine.
Will combine it with a VVT crank bolt capture.
 

RuskiRacer

Captain
Jul 17, 2019
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2009 e93 335i
IMG_20210816_081857_856.jpg
IMG_20210816_081900_424.jpg
 

JohnDaviz

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Jan 6, 2019
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335i E92 DCT
Was this the "old" crank hub design or the changed/revised one? The revised one came in 2014 according to RealOEM.
Vehicular DIY is talking about it: (he compares them at 4:14)
 

RuskiRacer

Captain
Jul 17, 2019
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2009 e93 335i
Old design, was watching his video after i spun my hub unfortunately probably could have made it last longer if I went to the new friction disk design
 

Jern54

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Oct 18, 2019
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E91 N54 335i
I have the 2nd gen hub in house but I didn't want to try it out and went with the splined crank hub from VTT.
 

RuskiRacer

Captain
Jul 17, 2019
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2009 e93 335i
Yeah I'm not the biggest fan of the spline idea I rather drill my my crank and hope the pins help. Any proven high hp setups with the spline lock rather than the vtt shop car
 

RuskiRacer

Captain
Jul 17, 2019
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2009 e93 335i
Pinned my crank tonight . Not sure what all the fuss is about seemed pretty easy to me to drill it. I guess if you guys don't wanna drill the cranks ill drill them for you doesn't scare me. Shooting for 900whp
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Jern54

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Oct 18, 2019
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E91 N54 335i
And I'm not impressed with the pinned design. The best/strongest solution would be the keyed joint connection. But that's pretty difficult to accomplish with just some hand tools.
 

RuskiRacer

Captain
Jul 17, 2019
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2009 e93 335i
I'm not impressed with a keyed design if any thing a keyed hub reduces the strength to the front of the crank then any other design
 

Jern54

Sergeant
Oct 18, 2019
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E91 N54 335i
Well, then we have a difference of opinion on that. The amount of material you take away wouldn't be that much and the reduced strength would me negligible.
The most stress on the crankshaft is not on that point anyway.
 

RuskiRacer

Captain
Jul 17, 2019
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2009 e93 335i
Well, then we have a difference of opinion on that. The amount of material you take away wouldn't be that much and the reduced strength would me negligible.
The most stress on the crankshaft is not on that point anyway.
Well nobody im aware besides maybe ghassan makes a keyed crank so its really not relevant to the n54 anyways
 

martymil

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Sep 6, 2017
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The VTT design is far superior vs a dowel pin in my opinion and everyone is entitled to one.

I've fitted about 5 of these now without a single failure including one on my own engine.

Your depending on a little pin to help stop the hub from spinning, seen many keyed hubs fail especially on diesels and they use a much larger
design than this.

Glad its working for you until it doesn't.
 

SLOWESTN54

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Feb 9, 2021
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2007 E92 335i
The VTT design is far superior vs a dowel pin in my opinion and everyone is entitled to one.

I've fitted about 5 of these now without a single failure including one on my own engine.

Your depending on a little pin to help stop the hub from spinning, seen many keyed hubs fail especially on diesels and they use a much larger
design than this.

Glad its working for you until it doesn't.
isn't it very common for key ways to fail on RB's
 

martymil

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Sep 6, 2017
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I guess it depends on the design.

The surface area the splinelock uses is much greater vs a pin or a key type lock.

It's just an observation from the failures I've seen.

The pin design is not bad and is much better than stock but they still fail
 

martymil

Major General
Sep 6, 2017
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1 case of v1 spline lock failure and that is suspect and none on the v2 out of the hundreds sold.

The keyway or pin lock fail all the time, its such an outdated design.

One only has to do a search to see how many fail, on the Mitsubishi diesels they use the exact same style water pump
design as the pin lock used here and I replaced dozens with a keyed design that lasted twice as long but still eventually failed.

The spline lock design has yet to prove itself how long it will last but so far so good.

I'm not going to tell anyone what they should run, I'm only going off what I observed over the decades in the business.

You want a flawed design that's known to fail vs a v2 spline lock design that has seen no failures that is your choice.

I just don't understand why BMW has not fixed the issue, they have to make money somehow I guess or an easy way
to deny warranty on a tuned engine when they spin the hub as stock ones have not really done it but the few isolated ones.