| Chris |
Posted
Monday, Oct 30th 1:03pm [Edit] [Quote] [IMS] [View car] |
Member
Post nr. 8
Melbourne, Australia
E21 - 320/4 E46 - 330ci |
Three track days, two bottom ends destroyed.
(Plus the odd valve or two)!! Both times a shell bearing disintegrated on the crank.
The engine is a 1977 M10 2 litre
Anyone have any views as to why?? Is there a problem with oil surge as both times it has been on extreme left hand cornering @ aprox. 7000 RPM. Would a baffle or windage plate help.
This is proving an expensive pastime - any words of wisdom would be appreciated as I don't want to rebuild it again without finding the cause of the problem.
Thanks, Chris |
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| jdench |
Posted
Monday, Oct 30th 3:24pm [Edit] [Quote] [IMS] [View car] |
Member
Post nr. 113
Sussex, UK
1979 E21 323i, 1998 E36 323i touring |
On E30 M3's you have to overfill the engine with oil on track days to prevent damage, so maybe a baffled sump would help. Have you thought about an uprated oil pump?
Or slowing down a bit  |
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| imaradiostar |
Posted
Monday, Oct 30th 4:18pm [Edit] [Quote] [IMS] [View car] |
Member
Post nr. 917
Nashville, TN
81 323i, 82 525i, 85 524td, 90 535i |
You'll eat a bearing in a hurry at that kind of cornering load and rpm!
Call Jim at Metric Mechanic. He's extremely helpful and will likely point you in the direction of some oiling system mods and ways to baffle the pan for high rpm turns.
jamie |
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| Madhatter |
Posted
Monday, Oct 30th 10:55pm [Edit] [Quote] [IMS] [View car] |
Member
Post nr. 75
Australia - QLD
E21, E24, E30 |
got any pics of the remains of the bearing shell, or other bearing shells? |
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| redmist |
Posted
Monday, Oct 30th 10:58pm [Edit] [Quote] [IMS] [View car] |
Member
Post nr. 994
NY USA
357i , 325i e30 turbo |
Nitrided crank would be a good idea. Prevents seizure during momentary oil starvation and not to expensive. |
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| Chris |
Posted
Tuesday, Oct 31st 2:20pm [Edit] [Quote] [IMS] [View car] |
Member
Post nr. 9
Melbourne, Australia
E21 - 320/4 E46 - 330ci |
Seems like we are agreed then - oil starvation problem!
Baffle plate seems to be a popular recommendation, but somehow I can't come to grips with the prospect of slowing down!!
Thanks guys |
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| JJG323 |
Posted
Tuesday, Oct 31st 2:38pm [Edit] [Quote] [IMS] [View car] |
Member
Post nr. 1277
Reading MA USA
1979 BMW 323i |
You can cryo the crank and use a crank scraper... |
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| cnvkellogg |
Posted
Tuesday, Oct 31st 5:01pm [Edit] [Quote] [IMS] [View car] |
Member
Eugene, OR
78 320i |
Shift to a higher gear or try a different rear gear ratio for the track.  but fix the motor first. |
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| cnvkellogg |
Posted
Tuesday, Oct 31st 5:01pm [Edit] [Quote] [IMS] [View car] |
Member
Post nr. 61
Eugene, OR
78 320i |
Shift to a higher gear or try a different rear gear ratio for the track. but fix the motor first. |
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