Bimmer Performance Center S63 tear down for bent rod (Pic Heavy)

Phil@BPC · 12-21-2017, 10:24 AM

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.

allmotor_2000 · 12-21-2017, 10:31 AM

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!

Used2be · 12-21-2017, 11:03 AM

Quote:

Originally Posted by Phil@BPC

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?

Phil@BPC · 12-28-2017, 04:33 PM

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.

DHUBM5 · 12-29-2017, 10:14 AM

Quote:

Originally Posted by allmotor_2000

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

josec70 · 12-30-2017, 07:28 AM

Great pics; thanks for sharing.

allmotor_2000 · 01-01-2018, 04:04 PM

Quote:

Originally Posted by DHUBM5

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

DHUBM5 · 01-02-2018, 09:44 AM

Quote:

Originally Posted by allmotor_2000

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.

3thirty5 · 01-20-2018, 11:46 PM

Wow what a great post, fantastic photos!

KMORGSM5 · 01-24-2018, 08:17 AM

Great photo's, there is so much stuff on these engines.

Phil@BPC · 01-24-2018, 09:31 AM

Thanks!

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

m5 guy · 01-24-2018, 12:16 PM

I enjoy threads like this, very informative. Thanks for posting!

josec70 · 01-24-2018, 05:59 PM

Great thread

12-21-2017, 10:24 AM	#1
Phil@BPC Lieutenant 463 Rep 489 Posts Drives: E39 M5/ E30 325is Join Date: Nov 2017 Location: Raleigh, NC iTrader: (0) Garage List 2003 BMW M5 [0.00] 1990 BMW 325is [0.00]	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.
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12-21-2017, 10:31 AM	#2
allmotor_2000 F10 1/4 WR: 9.9s / 142.5mph 1/2 WR: 175.5mph 1087 Rep 1,968 Posts Drives: 2018 RS3, 991 Turbo Join Date: Jul 2014 Location: Westlake Village, CA iTrader: (0)	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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12-28-2017, 04:33 PM	#4
Phil@BPC Lieutenant 463 Rep 489 Posts Drives: E39 M5/ E30 325is Join Date: Nov 2017 Location: Raleigh, NC iTrader: (0) Garage List 2003 BMW M5 [0.00] 1990 BMW 325is [0.00]	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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12-30-2017, 07:28 AM	#6
josec70 Major General 4065 Rep 5,231 Posts Drives: 22' Individual Chalk M5C Join Date: Dec 2015 Location: Miami iTrader: (2)	Great pics; thanks for sharing. __________________ CURRENT: 22' INDIVIDUAL M5\| CHALK \| TARTUFO \| CCB \| MPE \| H&R \| IND GONE: 19' M5C\| SINGAPORE GREY\| ARAGON\|VELOS VLS-06\|H&R\|iPE\|IND\|XPEL\|CF\|RADENSO GONE: 15' F10 M5\|BSM\|BLACK\|VELOS VSS-S2\|KW\|AKRA\|IND\|CF \|ESCORT 360\|VELOS PIGGY GONE: 13' F10 M5\|SG\|BLACK\|AKRA\|KW\|IND LONG GONE: 09' E60 M5\|02' E39 M5
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01-20-2018, 11:46 PM	#9
3thirty5 Major 95 Rep 1,018 Posts Drives: 2014 BMW M5 Join Date: Sep 2006 Location: Calgary, AB, Canada iTrader: (4) Garage List 2014 BMW M5 [0.00]	Wow what a great post, fantastic photos!
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01-24-2018, 08:17 AM	#10
KMORGSM5 Captain 320 Rep 843 Posts Drives: 14 CP M5 Join Date: Feb 2016 Location: South Florida iTrader: (0)	Great photo's, there is so much stuff on these engines.
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01-24-2018, 09:31 AM	#11
Phil@BPC Lieutenant 463 Rep 489 Posts Drives: E39 M5/ E30 325is Join Date: Nov 2017 Location: Raleigh, NC iTrader: (0) Garage List 2003 BMW M5 [0.00] 1990 BMW 325is [0.00]	Thanks! Yes, there are quite a few harnesses and hoses on the engines. Last edited by Phil@BPC; 01-25-2018 at 10:07 AM..
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01-24-2018, 12:16 PM	#12
m5 guy Brigadier General 1690 Rep 3,200 Posts Drives: 2020 M5 Comp Join Date: Apr 2012 Location: Hawaii iTrader: (14)	I enjoy threads like this, very informative. Thanks for posting! __________________ 2020 F90 M5 Comp Oxford Green Metallic II-Aragon JOURNAL 2016 F10 M5 Space Gray-Black SOLD 2012 E70 X5M Monte Carlo Blue-Silverstone SOLD 2001 E46 M3 Oxford Green Metallic II-Cinnamon SOLD
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01-24-2018, 05:59 PM	#13
josec70 Major General 4065 Rep 5,231 Posts Drives: 22' Individual Chalk M5C Join Date: Dec 2015 Location: Miami iTrader: (2)	Great thread __________________ CURRENT: 22' INDIVIDUAL M5\| CHALK \| TARTUFO \| CCB \| MPE \| H&R \| IND GONE: 19' M5C\| SINGAPORE GREY\| ARAGON\|VELOS VLS-06\|H&R\|iPE\|IND\|XPEL\|CF\|RADENSO GONE: 15' F10 M5\|BSM\|BLACK\|VELOS VSS-S2\|KW\|AKRA\|IND\|CF \|ESCORT 360\|VELOS PIGGY GONE: 13' F10 M5\|SG\|BLACK\|AKRA\|KW\|IND LONG GONE: 09' E60 M5\|02' E39 M5
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