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Old 09-16-2013, 11:39 AM   #1
MathR601
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L/F Good and honest shop (scary engine noise)

Hi,
After a quarter mile pass, my car began to make a really strange noise. I thought it was from the transmission because when I put it on D it only makes the sound when I press the pedal and before it actually open the throttle body (during the lag of the fly by wire). When I put it in DS mode it makes the sound at low rpm and it gets louder while the RPM climbs then it stops. I can also hear it when on Park when I hit the gas a bit. I went back from the track fine. I mean all the gears and fine, I'm pretty sure it's not tranny related. The noise occurs in DS and not really in D. It doesn't seem to be RPM dependent
Here is the mp3 when on park: https://docs.google.com/file/d/0B8kW...it?usp=sharing

I will try to do a compression test myself first.
Which shop should I go?

Thanks
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Old 09-16-2013, 12:24 PM   #2
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Yikes, did you ever get an oil pressure light? Sounds like it might be a spun rod bearing. Maybe do an oil analysis.
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Old 09-16-2013, 12:29 PM   #3
MathR601
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Yikes, did you ever get an oil pressure light? Sounds like it might be a spun rod bearing. Maybe do an oil analysis.
No didn't have an oil pressure light. Where can I go for the oil analysis and how long does it take?
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Old 09-16-2013, 12:34 PM   #4
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No didn't have an oil pressure light. Where can I go for the oil analysis and how long does it take?
The only one I know of is Blackstone and it takes time for you to get the kit, send it back and get the results. I imagine there has to be a local operation that could do it sooner. Perhaps a professional mechanic would be able to diagnose it easier though.
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Old 09-16-2013, 09:58 PM   #5
MathR601
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Alright so I did the compression test. 155-160 PSI across the board on a totally cold engine. I found engine oil in the spark plug hole of cylinder 2 and 3, but that's another problem.

The bad sound seems to be coming from under the timing chain cover. The engine had to be a little bit warm to make the noise (few minutes on idle). I could hear the sound when revved at about 2000 rpm. I could feel something banging inside with my hand touching the cover.

Any idea what could it be?
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Old 09-17-2013, 12:53 AM   #6
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Compression is good (don't sweat the actual number, all that matters is that it's not very low and consistent). Oil in sparkplug hole is just the valvecover gasket.

If it's oil temperature (read: pressure) dependent and in the head, it might be a lifter giving up the ghost.
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Old 09-18-2013, 09:30 AM   #7
MathR601
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My mechanic said it's a connecting rod bearing failure (at least one).
He suggests to replace the engine. He found one at 5500$ with 45000 km (28000 miles) + 30 hours to install.

Hard to tell how I feel right now.
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Old 09-18-2013, 10:22 AM   #8
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What kind of car is it? How technically saavy are you? Do you have garage space?
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just letting this furom [*forum] know
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Old 09-18-2013, 10:27 AM   #9
MathR601
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It's a 335i (N54). I don't have a garage space here. I like to do my own mechanic, but I never went that far into motor disassembling.
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Old 09-18-2013, 10:45 AM   #10
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You don't need to replace an engine for a failed bearing. It doesn't sound that bad yet, you may just need to polish the crank and replace the bearing. Get an estimate for doing that. Worst case it can't be that hard to dig up a crank. Worst of the worst case, you need to pull the motor to replace it anyway, so all you've lost is the extra time it takes to pull the oil pan and rod caps off the removed engine.

Don't just go buying a new motor. If you must, you can find one cheaper. Go pick this up or have it shipped:

http://ontario.kijiji.ca/c-cars-vehi...AdIdZ491677172

Also, 30 hours for a one for one engine swap for a pro???????
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Old 09-18-2013, 11:05 AM   #11
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Damn, that sucks.
IMO Before dropping 5K+ on another engine, I would tear down the current one and check the damage first. It might not be that bad. If the piston hasn't scored the cylinder walls, then best case scenario would just be a new crank and rod bearings. Which I think would be cheaper than a new/used engine with unknown history.

Edit: Late with my post...+1 to what BigD said
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Old 09-18-2013, 12:52 PM   #12
MathR601
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Thank you guys, I appreciate your help.

I think it's a big job to remove the oil pan to inspect the crank/bearings on the N54. You have to remove the subframe and other things. It might be worth it though. A new crankshaft with bearings is 1200$ http://www.ecstuning.com/BMW-E90-335...aft/ES2627487/.
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Old 09-18-2013, 01:39 PM   #13
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bummer. check pricing with this guy:

george at: rpm motorsports 613.722-9698
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Old 09-18-2013, 04:11 PM   #14
MathR601
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Quote:
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bummer. check pricing with this guy:

george at: rpm motorsports 613.722-9698
Thanks,
I just tried, but I hit a fax machine. Are you sure of the number?
And also it's RPM motorworks and not RPM motorsports?
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Old 09-18-2013, 04:29 PM   #15
MathR601
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Nevermind my last post. I called George @ RPM motorworks. He is a really nice person. I will try to bring my car there for another diagnostic. It's a 45 km drive (car is at la clinique de l'auto importée in Buckingham).

Any other shop?
Does anyone else have ever dealt with RPM motorworks?

It doesn't sound right to swap a motor without really know what is really going bad inside.
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