Rod Knock Gone After Replacing with BE Bearings

Boosted_M3 · 05-19-2019, 09:43 AM

Hey guys,
I am just sharing a recent experience. I had a 'heavier' metallic knocking sound when the car was warm and I would pulse the throttle to 1K and 1.5K.

The car is a 2010 with only 15K, but I recently installed a Harrop Supercharger, so I took it straight to the shop to have it checked out.

Mike at BPM Sport supplied the BE bearings and rod bolts and the team at Performance Technique (PT) in Fremont, CA did the work. Joe and the team at PT are outstanding and the work was fast and clean.

Long story short, my old OEM rod bearings were fine. The tech (Kendall, cool guy) did note that the old bearings were loose in the journals and dropped out upon dissassembly.

The symptom noise is now gone though and I have been running for ~800 miles since.

I thought I would share this unique experience of a knocking noise with bearings in fine condition.

Boosted_M3 · 05-19-2019, 09:46 AM

If anyone needs this work done in the bay area I highly recommend Performance Technique in Fremont, CA. I am a mechanical engineer and I typically do my own work, so it is hard for me to trust shops, but PT came well recommended and they exceeded expectations. When I got the car back I could not even tell a single bolt was removed and the car drove flawlessly. Thanks Joe and PT Team!

Special thanks to Mike at BPM Sport for jumping through hoops to get me a set of BE Bearing and bolts in time!

kyippee · 05-19-2019, 11:05 AM

I'm pretty sure I sure I saw your car in the shop recently. Glad you got the problem solved!

Boosted_M3 · 05-19-2019, 11:08 AM

👍 this is the car

E90M3velocity · 05-19-2019, 09:23 PM

Nice, I need to hear how loud that whine is one of these days.

roastbeef · 05-19-2019, 09:58 PM

those bearings are already starting to show some wear for 15k. if you had 100k on the car, we'd talk more, but at 15k, the wear isn't great.

chocstraw · 05-25-2019, 01:36 AM

What was the oil before and after the service?

Any chance that you were hearing valve or other drivetrain noise, usually a clicking sound, and changing the oil got rid of that noise?

It seems normal for some oils to be noisier than others.

My car seems to make noises at the RPMs you described but I try to quell my fears and just accept that the S65 is a noisy engine.

pbonsalb · 05-25-2019, 04:59 AM

I will guess the sound was not rod knock. Your bearings would show it if you had it. But whatever it was, it got fixed as a result of the car being taken apart underneath and put back together again. Time to start driving the car. 1.5k miles per year is not much.

doogee · 05-25-2019, 08:49 AM

Definitely wasn't rod knock or bearing related but hey at least the noise is gone.

bmwlover0725 · 05-25-2019, 11:40 AM

This may be one of the most interesting cases yet!

tdott · 05-25-2019, 03:35 PM

Quote:

Originally Posted by bmwlover0725

This may be one of the most interesting cases yet!

Nope sounds like a misdiagnosed noise.
It can't be rod knock, if there is no play in the rod assembly to cause a knock. The noise has to come from somewhere.

chocstraw · 05-25-2019, 04:02 PM

Quote:

Originally Posted by tdott

Nope sounds like a misdiagnosed noise.
It can't be rod knock, if there is no play in the rod assembly to cause a knock. The noise has to come from somewhere.

It’s valve noise, common at those RPMs, and usually solved by a flush or new oil. Wish this forum wouldn’t promote so much hysteria around these rod bearings. Just because they wear doesn’t mean they’ll seize or spin anytime soon.

At least this mania has led to awesome prices on the secondary market.

https://www.m3post.com/forums/showthread.php?t=1167323

https://www.m3post.com/forums/showthread.php?t=1418410

#3

pbonsalb · 05-25-2019, 05:04 PM

It’s not mania. Educate yourself by looking at pictures of bearings that come out of these motors. About 90% look bad.

https://www.m3post.com/forums/showth...253084&page=48

Boosted_M3 · 06-03-2019, 11:39 PM

It could have been valves, but it had a heavier sound which was most audible near the driver side wheel closer to the ground. I will try to upload a video of the before condition.

GORDON.M3 · 06-04-2019, 01:53 AM

Quote:

Originally Posted by doogee

Definitely wasn't rod knock or bearing related but hey at least the noise is gone.

This...

bmwlover0725 · 06-04-2019, 08:36 AM

The tabs do look fairly worn. It's probably good that you had them replaced even though the wear isn't too bad.

05-19-2019, 09:43 AM	#1
Boosted_M3 Private First Class 62 Rep 154 Posts Drives: 2010 E92 M3 Join Date: Jan 2019 Location: San Jose, CA iTrader: (1)	Hey guys, I am just sharing a recent experience. I had a 'heavier' metallic knocking sound when the car was warm and I would pulse the throttle to 1K and 1.5K. The car is a 2010 with only 15K, but I recently installed a Harrop Supercharger, so I took it straight to the shop to have it checked out. Mike at BPM Sport supplied the BE bearings and rod bolts and the team at Performance Technique (PT) in Fremont, CA did the work. Joe and the team at PT are outstanding and the work was fast and clean. Long story short, my old OEM rod bearings were fine. The tech (Kendall, cool guy) did note that the old bearings were loose in the journals and dropped out upon dissassembly. The symptom noise is now gone though and I have been running for ~800 miles since. I thought I would share this unique experience of a knocking noise with bearings in fine condition. Attached Images
	Appreciate 1 ///M Power-Belgium63299.50 Tweet Quote

05-19-2019, 09:46 AM	#2
Boosted_M3 Private First Class 62 Rep 154 Posts Drives: 2010 E92 M3 Join Date: Jan 2019 Location: San Jose, CA iTrader: (1)	If anyone needs this work done in the bay area I highly recommend Performance Technique in Fremont, CA. I am a mechanical engineer and I typically do my own work, so it is hard for me to trust shops, but PT came well recommended and they exceeded expectations. When I got the car back I could not even tell a single bolt was removed and the car drove flawlessly. Thanks Joe and PT Team! Special thanks to Mike at BPM Sport for jumping through hoops to get me a set of BE Bearing and bolts in time!
	Appreciate 1 ///M Power-Belgium63299.50 Quote

05-19-2019, 11:08 AM	#4
Boosted_M3 Private First Class 62 Rep 154 Posts Drives: 2010 E92 M3 Join Date: Jan 2019 Location: San Jose, CA iTrader: (1)	👍 this is the car Attached Images
	Appreciate 1 chocstraw495.50 Quote

05-19-2019, 09:23 PM	#5
E90M3velocity Captain 338 Rep 923 Posts Drives: Manual-Slicktop E90 M3 Join Date: Oct 2012 Location: Bay Area CA iTrader: (4)	Nice, I need to hear how loud that whine is one of these days.
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05-19-2019, 09:58 PM	#6
roastbeef Lieutenant General 11585 Rep 12,725 Posts Drives: E92 M3 Join Date: Nov 2010 Location: Orange County, CA iTrader: (4)	those bearings are already starting to show some wear for 15k. if you had 100k on the car, we'd talk more, but at 15k, the wear isn't great. __________________ Instagram; @roastbeefmike
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05-19-2019, 11:05 AM	#3
kyippee Lieutenant Colonel 1072 Rep 1,617 Posts Drives: E92 M3, Supra MK5, F44 235GC Join Date: Feb 2017 Location: SF Bay Area iTrader: (0)	I'm pretty sure I sure I saw your car in the shop recently. Glad you got the problem solved!
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05-25-2019, 01:36 AM	#7
chocstraw Lieutenant 496 Rep 457 Posts Drives: E92 M3 ZCP Join Date: Apr 2019 Location: Los Angeles iTrader: (0)	What was the oil before and after the service? Any chance that you were hearing valve or other drivetrain noise, usually a clicking sound, and changing the oil got rid of that noise? It seems normal for some oils to be noisier than others. My car seems to make noises at the RPMs you described but I try to quell my fears and just accept that the S65 is a noisy engine.
	Appreciate 1 Iwantbmwm321.50 Quote

05-25-2019, 04:59 AM	#8
pbonsalb Lieutenant General 5227 Rep 10,611 Posts Drives: 18 F90 M5, 99 E36 M3 Turbo Join Date: Feb 2011 Location: New England iTrader: (4)	I will guess the sound was not rod knock. Your bearings would show it if you had it. But whatever it was, it got fixed as a result of the car being taken apart underneath and put back together again. Time to start driving the car. 1.5k miles per year is not much.
	Appreciate 1 chocstraw495.50 Quote

05-25-2019, 08:49 AM	#9
doogee Major 748 Rep 1,256 Posts Drives: '08 M3, '09 328xi Sport Wagon Join Date: Oct 2008 Location: Ancaster, ON, Canada iTrader: (0)	Definitely wasn't rod knock or bearing related but hey at least the noise is gone. __________________
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05-25-2019, 11:40 AM	#10
bmwlover0725 Second Lieutenant 131 Rep 265 Posts Drives: 2008 M3 Coupe Join Date: Jun 2015 Location: Syracuse, NY iTrader: (1)	This may be one of the most interesting cases yet! __________________
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05-25-2019, 05:04 PM	#13
pbonsalb Lieutenant General 5227 Rep 10,611 Posts Drives: 18 F90 M5, 99 E36 M3 Turbo Join Date: Feb 2011 Location: New England iTrader: (4)	It’s not mania. Educate yourself by looking at pictures of bearings that come out of these motors. About 90% look bad. https://www.m3post.com/forums/showth...253084&page=48
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06-03-2019, 11:39 PM	#14
Boosted_M3 Private First Class 62 Rep 154 Posts Drives: 2010 E92 M3 Join Date: Jan 2019 Location: San Jose, CA iTrader: (1)	It could have been valves, but it had a heavier sound which was most audible near the driver side wheel closer to the ground. I will try to upload a video of the before condition.
	Appreciate 0 Quote

06-04-2019, 08:36 AM	#16
bmwlover0725 Second Lieutenant 131 Rep 265 Posts Drives: 2008 M3 Coupe Join Date: Jun 2015 Location: Syracuse, NY iTrader: (1)	The tabs do look fairly worn. It's probably good that you had them replaced even though the wear isn't too bad. __________________
	Appreciate 0 Quote