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Thanks Andy! I haven't gone in depth like this but I do wonder if some of it has to do with the lack of a cat. convertor. When I get it running again I will have to try that solution as I previosuly found a cracked exhaust manifold. I am following along with Robert's euro E12 that seems to have simi...

Car looks great! Also looks like you have the rare 16" E28 M5 wheels by chance.

So the car hasn't been cooperating and won't start for me now. I haven't had a lot of chance to continue diagnosing and I have tried the following without luck: Spare Ecu New Ignition control Unit Spare distributor spare combo relay New ballast resistor New rotor replacement fuel pump spare coolant ...

OK, right out of an actual wire bound hard copy electrical troubleshooting manual please refer to the attached PDF =D> And as per Brucey (like he's ever wrong #-o ) the red/blk wire goes to the + side of the coil and the blk wire goes to the - side :wink: On my '80, that green wire from the dizzy d...

It is a rare car and should be restored, in my opinion. I agree. Even for lemons the turbo engine will not be reliable enough for you to be competitive, especially when the turbo or wastegate fails. The most important thing there is running reliably and making lap after lap. So I would say upgrade ...

Hope it passes as the smog rules are silly for collector cars that are not the mass market.

Hope all is well for you Andy!

Wow great work on this!!

How bad is the rust on this one?

Car is sold with a buyer from CA currently driving it back there. Happy to say it went to an enthusiast looking specifically for an E12 euro reminding him of a previous 630CS. Hoping he will join the board and post his progress on the project. I only have the RC090 wheels remaining available for pur...

Saved for first dibs for the buyer. If they do not sell with the car, possibly.

Thank you Rainer!

Looking to sell my 1981 635CSi project. I bought it from the original owner who imported it from Germany. It lived in Texas before being brought to Colorado in the early 2000's. I bought it non running and have rebuilt the head and headgasket and gotten it road worthy again with Motronic 1.3 swap fr...

I have front grilles if you need. Not sure if I have the passenger front turn signal, but are you looking for euro lens or us spec lens?

Mine went out on the '81 car I have and I retrofit the later E28 based relay. You just have to look at the wiring pinout and it will work just the same.

$15 or already in your parts bin if you go that route. It's a 3 prong relay and the ground wire from the old relay simply isn't used.

For sale, ECU and matching AFM from 1981 635CSi. I believe it is working but can not confirm the ECU is 100%. The car ran but did not rev on this setup. Turns out the reference flywheel pin was causing the problems so we upgraded to M1.3. I have these parts for the rare 1981 635CSi which is M90 with...

Spent a bit more time on the car tonight. Installed a new flasher relay (e28 3 pin style) as the 4 pin wasn't working. Working turn signals are sort of important :-" :-" Checked and now have full lighting and power to fog light wires even though there are no fogs. Working turn signals and rear euro ...

I spent a bit more time on small projects on the '81. I installed my NEW Hella euro headlights. High beams and low beams are all set up with euro parts, so city lights are operational again :) The light's weren't working properly but are now. Again, I am amazed at the lack of rust on this car, on th...

Enjoy the time off work!!
Shame you missed seeing us at D4C last weekend! I think you'd really enjoy it.

The cam will likely be the less duration head so it will actually be a downgrade. The early 533/633 had the better cam and lighter flywheel.

Now 20 miles on the car, I am starting to believe the rebuild was a success-- the engine is running smoothly and slowly smoking less and less! I suspect the oil consumption is just burning off of oil from the exhaust manifolds that were on the car with the other cylinder head (the one that was crack...

Found the nut for one of the eccentrics to be stripped. Replaced that and the engine quieted down nicely. =D> Went around the block now just over 10 km's. It drives quite nicely and shifts better than I expected. the suspension is sure cushy and soft with whatever sway bars are on it. Found some mor...

Likely M30b32 with L-jetronic fuel injection.

I got the car back together and started. Later style fan clutch and water pump in place. and all of it running M1.3 from an E34. It seems one of the valves is really noisy and I suspect it is the one valve that the eccentric nut wouldn't seem to tighten properly on cylinder 4. will investigate here ...

Great job in the repairs-- interesting to see mine looks pretty similar in terms of rust and age-- maybe less rust to repair although I don't know that I can do it like you did.

Car looks great!

This is a great resource for the blue binder bmw factory tech booklet:

https://www.bmwtechinfo.com/repair/main/007en/index.htm

If it is the original engine, it wouldn't be an M90.