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      12-21-2017, 12:24 PM   #1
Phil@BPC
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Bimmer Performance Center S63 tear down for bent rod (Pic Heavy)

Hey guys here are some photos I took during a tear down of an F10 that came in. Customer brought this M5 in because of a really bad sound coming from the engine. Surprisingly a check engine light never came on or a warning message. Once we brought it into our center we could hear the noise right away. Once we looked over the car and made sure everything externally was ok we performed a compression test. During this test we found cylinder 5 to be the culprit. We pulled the drivers side cylinder head and removed piston/ rod combination from cylinder 5. Hope this sheds light on something that's rarely seen.
































































Only very minor scoring on the cylinder walls. Most impressive is that the cylinder bore has a bend about half way facing the passenger side.







The culprit... still amazing this didn't set a check engine light or any malfunction warning messages.







      12-21-2017, 12:31 PM   #2
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Nice breakdown... very common culprit. Too bad folks can prevent a lot of this by reading the plugs well beforehand. See the piston crown... so telling!
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      12-21-2017, 01:03 PM   #3
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Quote:
Originally Posted by Phil@BPC View Post
Hey guys here are some photos I took during a tear down of an F10 that came in. Hope this sheds light on something that's rarely seen.
Thanks for all the pictures. With the wrapped DPs I assume the motor had a tune of some sort?
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      12-28-2017, 06:33 PM   #4
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Correct this one did have a tune on it.

This S63 is going to be getting the BPC treatment. We will be building this motor. I will begin a new thread in a separate part of the forum. Ill tag this thread and the other together so they can be followed.
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      12-29-2017, 12:14 PM   #5
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Quote:
Originally Posted by allmotor_2000 View Post
Nice breakdown... very common culprit. Too bad folks can prevent a lot of this by reading the plugs well beforehand. See the piston crown... so telling!
How can you safeguard against bent rods? Other than by not tuning your car cause that ship has sailed for me
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      12-30-2017, 09:28 AM   #6
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Great pics; thanks for sharing.
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      01-01-2018, 06:04 PM   #7
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How can you safeguard against bent rods? Other than by not tuning your car cause that ship has sailed for me
1. Tune for less torque down low (max at 650wtq sub-4K RPM)
2. Good gas... often rod will bend during a catastrophic event (pre-ignition)

Typically these rods are not bending because of the power levels, its more in the tuning and power profile
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      01-02-2018, 11:44 AM   #8
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Quote:
Originally Posted by allmotor_2000 View Post
1. Tune for less torque down low (max at 650wtq sub-4K RPM)
2. Good gas... often rod will bend during a catastrophic event (pre-ignition)

Typically these rods are not bending because of the power levels, its more in the tuning and power profile
Thanks for the info.
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      01-21-2018, 01:46 AM   #9
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Wow what a great post, fantastic photos!
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      01-24-2018, 10:17 AM   #10
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Great photo's, there is so much stuff on these engines.
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      01-24-2018, 11:31 AM   #11
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Thanks!

Yes, there are quite a few harnesses and hoses on the engines.

Last edited by Phil@BPC; 01-25-2018 at 12:07 PM.
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      01-24-2018, 02:16 PM   #12
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I enjoy threads like this, very informative. Thanks for posting!
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      01-24-2018, 07:59 PM   #13
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Great thread
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