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Old 09-21-2009, 11:25 AM   #16
MarkD
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Quote:
Originally Posted by DINAN 3 View Post
What not to do...

http://www.m5board.com/vbulletin/e39...lew-motor.html

http://www.m5board.com/vbulletin/e39...s-learned.html

Someone seems to be blowing a motor every couple of months.....figured that these M powerplants were a little more robust...my neighbour treats his Accord like crap...yet never has to service or repair it.
I don't feel like those two links are good examples at all.

The first guy took his car to the salt flats when low on oil, drove 173 mph and rev'd to 7800 rpm under heavy load.

The second guy heard bad noises from his car for at least a week or two prior to going to the track but ignored it.

I'd really have to say that the failures you supplied links to are just boneheads who asked for them. Any more valid links?

Last edited by MarkD; 09-21-2009 at 11:28 AM.
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Old 09-21-2009, 11:45 AM   #17
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Originally Posted by richie_s999 View Post
k this thread is going down the shitter if you ask me, these links show examples of guy's blowing motors doing salt runs, and driving hard, sorry, everyone who has a m5 drives fast, why else would you have an m5???? Seems to be a problem with the bearings.....there are a lot of BMW's with less then 5000km going through the auctions right now with knocking motors. I think the reason be hind these things has NOTHING TO DO WITH SOFT WARE OR REV LIMITS!!!! the bearing design or metal being used or what ever heat traeat they use is not good enought for the high rpms and torque the motors are putting out.

AND YOU CAN NEVER COMPAIR AN ACCORD TO A BMW!!!!!!!!!!!

also would like to know what specific oils these guys blowing there motors are running....hate to say it but to many people buy a fast car, and then cheap out and don't use approved oils......
You are correct.....problem seems to be well documented...see ~>

http://www.m5board.com/vbulletin/e39...-pictures.html

Sorry about the long read, but here you can find plenty of post of low mileage motors documented with the same problem.

Last edited by DINAN 3; 09-21-2009 at 11:48 AM.
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Old 09-21-2009, 11:53 AM   #18
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Quote:
Originally Posted by MarkD View Post
I don't feel like those two links are good examples at all.

The first guy took his car to the salt flats when low on oil, drove 173 mph and rev'd to 7800 rpm under heavy load.

The second guy heard bad noises from his car for at least a week or two prior to going to the track but ignored it.

I'd really have to say that the failures you supplied links to are just boneheads who asked for them. Any more valid links?
I agree.....to some extend...as I believe that these engines should be able to handle some abuse, like being low by 1/2 quart, under full power.
Also, wondering why these low mileage engines are exhibiting minor knocking/pinging noises to begin with ?
In short, my original post just served as warning to not unduly rev this engine above it's original 7200 rpm rev limit.....just because it has now been raised to 7500 rpm.
Mark, I fully agree with you that going to 7500 rpm on the rare occasion will probably not harm the engine, as long as it's in PERFECT shape.
Just wanted the OP to be aware of that risk.

Last edited by DINAN 3; 09-21-2009 at 12:00 PM.
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Old 09-21-2009, 12:50 PM   #19
Bullet Ride
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Originally Posted by DINAN 3 View Post
I agree.....to some extend...as I believe that these engines should be able to handle some abuse, like being low by 1/2 quart, under full power.
Also, wondering why these low mileage engines are exhibiting minor knocking/pinging noises to begin with ?
In short, my original post just served as warning to not unduly rev this engine above it's original 7200 rpm rev limit.....just because it has now been raised to 7500 rpm.
Mark, I fully agree with you that going to 7500 rpm on the rare occasion will probably not harm the engine, as long as it's in PERFECT shape.
Just wanted the OP to be aware of that risk.
Yeah I did a bit of reading as well. There's extensive discussion here

http://www.m5board.com/vbulletin/e39...e-6500rpm.html

the one comment that really stuck out was
Quote:
What aggravates the you know what out of me is that I never tracked the car - never had it above 6K RPM and the oil level was never below a half a quart down.

STILL spun two bearings and DID have to replace the rods and crank - lucky effen me
There are so many variables to consider, but I do agree that high rpms will amplify any weaknesses in the system. So if a car has high mileage and the rod bearing clearances have opened up slightly, or if an owner is using the wrong grade of oil... etc and all of the above, the chances for failure are greater. All you can do is keep your car well maintained, use some common sense when driving, and hope for the best. Or you can drive the piss out of your car but make sure to rebuild the bottom end every year like the race teams do.
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Old 09-21-2009, 12:59 PM   #20
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Yeah I did a bit of reading as well. There's extensive discussion here

http://www.m5board.com/vbulletin/e39...e-6500rpm.html

the one comment that really stuck out was

There are so many variables to consider, but I do agree that high rpms will amplify any weaknesses in the system. So if a car has high mileage and the rod bearing clearances have opened up slightly, or if an owner is using the wrong grade of oil... etc and all of the above, the chances for failure are greater. All you can do is keep your car well maintained, use some common sense when driving, and hope for the best. Or you can drive the piss out of your car but make sure to rebuild the bottom end every year like the race teams do.
And use a friction reducing additive such as Molyslip, that will help reduce wear. I use it in my cars.
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