The E31 850i (6MT) Project begins. Dyno, Exhaust, and more!

Tejas1836 · 02-25-2026, 08:45 AM

Great car, great thread!

Gottagofast · 02-26-2026, 05:21 PM

Disassembly begun a few days ago. Valve covers will most likely get powder coated.

Some evidence of oil starvation on the cam lobe furthest from the oil pump which isn't too bad considering the age of this engine. Lots of milkshake though, glad it didn't end up catastrophic.

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Gottagofast · 02-27-2026, 05:38 PM

So, we prevented a catastrophe or limited its damage just in time. The clutch is in some sorry state I've never seen before and the flywheel has been glazed by the rear main leaking.

Good news is that the engine and the Getrag unit are intact and will be put back together with much overdue TLC.... and perhaps with some special custom sauce

Gottagofast · 03-04-2026, 10:25 AM

My organic BMW milkshake brings all the boys....

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Gottagofast · 03-20-2026, 04:10 AM

I can reuse these, right.

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We compiled the list of all we need and ordered them a week or so back. The list is very long and some of these parts are essentially the last ones on planet earth so I'm very sorry for people trying to refresh their M70 after me. Here's a snippet:

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dumptruck · 03-20-2026, 07:08 AM

Not sure if you saw this:

https://bringatrailer.com/listing/1994-bmw-850csi-25-2/

Gottagofast · 03-20-2026, 10:54 AM

Quote:

Originally Posted by dumptruck

Not sure if you saw this:

https://bringatrailer.com/listing/1994-bmw-850csi-25-2/

I did, made me very happy with my decision to do a proper restoration

.

02-25-2026, 08:45 AM	#23
Tejas1836 Major 1710 Rep 1,304 Posts Drives: 2023 F95 Workmaster 75 Join Date: Oct 2022 Location: Tejas iTrader: (0)	Great car, great thread! __________________ Two is One and One is None
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02-26-2026, 05:21 PM	#24
Gottagofast Lieutenant 1597 Rep 434 Posts Drives: '25 M4 CS Join Date: Jul 2019 Location: Canada iTrader: (1) Garage List 2025 M4 CS [10.00]	Disassembly begun a few days ago. Valve covers will most likely get powder coated. Some evidence of oil starvation on the cam lobe furthest from the oil pump which isn't too bad considering the age of this engine. Lots of milkshake though, glad it didn't end up catastrophic. __________________ '25 M4 CS Riviera Blue - '23 M4 XD SPY - '11 E92 M3 6MT - '00 E39 M5 6MT - '98 E38 750iL - '91 E31 850i 6MT
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02-27-2026, 05:38 PM	#25
Gottagofast Lieutenant 1597 Rep 434 Posts Drives: '25 M4 CS Join Date: Jul 2019 Location: Canada iTrader: (1) Garage List 2025 M4 CS [10.00]	So, we prevented a catastrophe or limited its damage just in time. The clutch is in some sorry state I've never seen before and the flywheel has been glazed by the rear main leaking. Good news is that the engine and the Getrag unit are intact and will be put back together with much overdue TLC.... and perhaps with some special custom sauce Attached Images __________________ '25 M4 CS Riviera Blue - '23 M4 XD SPY - '11 E92 M3 6MT - '00 E39 M5 6MT - '98 E38 750iL - '91 E31 850i 6MT
	Appreciate 2 Aldor27116.00 Agent11br453.50 Quote

03-04-2026, 10:25 AM	#26
Gottagofast Lieutenant 1597 Rep 434 Posts Drives: '25 M4 CS Join Date: Jul 2019 Location: Canada iTrader: (1) Garage List 2025 M4 CS [10.00]	My organic BMW milkshake brings all the boys.... __________________ '25 M4 CS Riviera Blue - '23 M4 XD SPY - '11 E92 M3 6MT - '00 E39 M5 6MT - '98 E38 750iL - '91 E31 850i 6MT
	Appreciate 1 0-60Motorsports1106.50 Quote

03-20-2026, 04:10 AM	#27
Gottagofast Lieutenant 1597 Rep 434 Posts Drives: '25 M4 CS Join Date: Jul 2019 Location: Canada iTrader: (1) Garage List 2025 M4 CS [10.00]	I can reuse these, right. We compiled the list of all we need and ordered them a week or so back. The list is very long and some of these parts are essentially the last ones on planet earth so I'm very sorry for people trying to refresh their M70 after me. Here's a snippet: __________________ '25 M4 CS Riviera Blue - '23 M4 XD SPY - '11 E92 M3 6MT - '00 E39 M5 6MT - '98 E38 750iL - '91 E31 850i 6MT
	Appreciate 0 Quote

03-20-2026, 07:08 AM	#28
dumptruck Private First Class 1031 Rep 189 Posts Drives: BMW Join Date: Mar 2025 Location: U$A iTrader: (0)	Not sure if you saw this: https://bringatrailer.com/listing/1994-bmw-850csi-25-2/
	Appreciate 0 Quote