I blew the engine...lessons learned. - BMW M5 Forum and M6 Forums
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post #1 of 173 Old 21st September 2009, 03:21 AM Thread Starter
PAUL HUGHES
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I blew the engine...lessons learned.

I think I blew a rod bearing cap through the oil pan or block.


I was at Monticello Motor Club, a great technical track, and on my 4th time out for the day, coming around a turn, full acceleration in 3rd - maybe 4000 - 6000 rpms, and blue smoke out the front right wheel well, then loss of power, loss of power steering, etc.
at first I thought I blew a tire, then I thought I busted the fan belts. but after I got out of the car, I saw a trail of oil, and oil coming out from under the engine. tires were fine. fan belts fine.


the flag man said he saw flames under the car when it happened.
the Porsche driver in back of me said he saw a ball of flame coming out from under the car.
I assume it was engine oil hitting hot exhaust pipe.
I found a 2" x 2" piece of oil pan or engine block when we rolled the car off the flatbed.
interestingly enough, the dip stick still shows being only 3/4 of a quart low on oil.
i'm not sure what turns when i engage the starter motor, but it is not making compression to start the motor.


what probably happened:
a rod bearing was bad, and it blew under the constant pressure of running up gears 2, 3 and 4 to close to redline.


in the week or 2 before track day, I heard a tapping at startup, occasionally when cold.
I kept thinking it sounds like a rod bearing, but then would think maybe it's gear lash (that usually happens, buy only when warm).
it made no sense to me that a rod bearing would be bad.
I also heard continual tapping occasionally, in first gear, 2000 - 3000 rpms, under very light throttle.
prior to that last circuit, I think I heard it as I was moving forward in the line of cars getting ready to go out on the track.
but I kept thinking .."it can't be"...


so the car is at Motor Works West in Wyckoff, NJ.
I will get an update from them when they put it up on a lift.


Lessons learned:
When the car tells you something, listen to it!
Stop and fix the problem, before it gets worse!
Try not to rationalize something as something other than what the facts are telling you.


i placed a "wanted to buy" for a used engine in the "wanted/for sale" threads, because it will probably be less expensive than repairing the 58,000 mile motor.
if anyone knows where i can put my hands on one, please let me know.

all gone now, except for engine and trans.
the guardrail was stronger than the car, but it absorbed it nicely.
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post #2 of 173 Old 21st September 2009, 03:31 AM
malexgcab
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post #3 of 173 Old 21st September 2009, 03:35 AM Thread Starter
PAUL HUGHES
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maybe - i will PM him.
thanks.

all gone now, except for engine and trans.
the guardrail was stronger than the car, but it absorbed it nicely.
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post #4 of 173 Old 21st September 2009, 05:14 AM
KevinM
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So sorry to hear...Stock redline or raised? Do you know the history of oil changes (when and with what oil)?

GL with the engine replacement.

Kevin

2002 M5, Sterling Gray/Caramel
2007 Z4M Coupe (#2) Silver Gray/Black
1999 Mercedes ML320 (hauler...)
Too many kids' cars...
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post #5 of 173 Old 21st September 2009, 05:18 AM
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post #6 of 173 Old 21st September 2009, 05:19 AM Thread Starter
PAUL HUGHES
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stock engine/redline. i change the engine oil every 5 - 10,000 miles, 5 - 30 synthetic, but i only owned it for 20,000 miles.
i did change the engine oil and filter, transmission oil and brake fluid, etc. in preparation for track day.

all gone now, except for engine and trans.
the guardrail was stronger than the car, but it absorbed it nicely.
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post #7 of 173 Old 21st September 2009, 05:21 AM
razahyde
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Quote:
Originally Posted by malexgcab View Post
Doesn't Razahyde have a spare engine?
2 of them to be technical....
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post #8 of 173 Old 21st September 2009, 05:23 AM Thread Starter
PAUL HUGHES
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Quote:
Originally Posted by wentouch View Post
There's also this option:

Cheapest M5 yet?
good thought, but i question the high mileage. i might consider if i give up having fun with tracking the car.

all gone now, except for engine and trans.
the guardrail was stronger than the car, but it absorbed it nicely.
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post #9 of 173 Old 21st September 2009, 05:29 AM
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post #10 of 173 Old 21st September 2009, 05:31 AM Thread Starter
PAUL HUGHES
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58,000.
i don't know what could have caused the rod noise, though.

all gone now, except for engine and trans.
the guardrail was stronger than the car, but it absorbed it nicely.
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