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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Tue, Jun-19-2018, 02:29:08 PM   #1
Obioban
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Arrow A good example of why my engine internals have remained stock

http://www.m3post.com/forums/attachm...2&d=1529351493

Credit to jcolley for finding this!

Fun seeing BMW internal documents that don't normally make it out.
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Last edited by Obioban; Tue, Jun-19-2018 at 02:44:28 PM.
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Old Tue, Jun-19-2018, 02:35:21 PM   #2
CrookedCommie
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Default Re: A good example of why my engine internals have remained stock



I understood "V10"
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Old Tue, Jun-19-2018, 02:38:42 PM   #3
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Default Re: A good example of why my engine internals have remained stock

Can we get cliff notes for plebeians like myself?
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Old Tue, Jun-19-2018, 02:42:16 PM   #4
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Default Re: A good example of why my engine internals have remained stock

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Originally Posted by CrookedCommie View Post


I understood "V10"
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Old Tue, Jun-19-2018, 02:43:34 PM   #5
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Default Re: A good example of why my engine internals have remained stock

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Originally Posted by ldev869 View Post
Can we get cliff notes for plebeians like myself?
BMW already did the work.
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Old Tue, Jun-19-2018, 02:44:20 PM   #6
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Default Re: A good example of why my engine internals have remained stock

Well, that is the reason BMW and other car manufacturers employ material/motor engineers and chemists to calculate and test things like that. I honestly chuckle every time somebody says they figure out a way to "improve" on something that is as complex as modern engines/gearboxes.

Certain components and parts - yes. Engines - very unlikely.
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Old Tue, Jun-19-2018, 02:46:32 PM   #7
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Default Re: A good example of why my engine internals have remained stock

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Originally Posted by CrookedCommie View Post


Spot on.
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Old Tue, Jun-19-2018, 02:52:05 PM   #8
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Default Re: A good example of why my engine internals have remained stock

Wow, very cool.
If only they had done that for the S54...
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Old Tue, Jun-19-2018, 03:19:20 PM   #9
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Default Re: A good example of why my engine internals have remained stock

Good Find!

I would love to see technical documentation like this for the s54.
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Old Tue, Jun-19-2018, 03:21:41 PM   #10
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Default Re: A good example of why my engine internals have remained stock

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Originally Posted by ldev869 View Post
Can we get cliff notes for plebeians like myself?
Crankshafts are pieces of metal. Even though they may feel rigid and immobile when you hold them, with enough force at the right frequency/ speed they (like any other piece of metal) will start to bend and flex. As they do, the geometry of the engine is compromised, and the balance of the engine that may work perfectly at a "static" state no longer holds true in a dynamic scenario.

While some things like weight and bearing size may be reduced for a reduction in rotational inertia, reduce too much or in the wrong way and the dynamic scenario is even worse.

This presentation essentially explains the simulation of the engine to account for all of these dynamic states, and how they optimized the engine internals to not only reduce the rotating mass of the engine, but reduce the stress on bearings, etc.


...granted, based on the actual lifespan of a BMW V10, I kinda wish they were simulating for a lifespan beyond 1 warranty period.. but hey, it's cool engineering
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Discussing A good example of why my engine internals have remained stock in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)