my M3 CSL

[digi]

dame - nice work.

[alexk]

13.03.2014

So back to the rebuild saga.
Here are the thermostat tests -> thread

Now here is the picture of my radiator.
A lot of dirt. No wonder the cooling system was not performing good.



More updates to follow in the next days.

[alexk]

16.03.2014

A busy weekend but managed to do a lot of things.

Here is the old vs new water pump.
The new pump is slightly different inside, where the bushing is. Also the geometry is slightly different inside. Maybe the flow will be be better (?).



Here the water pump installed, with new pulleys and belts.
Also new thermostat and water hoses. Just being proactive with the water hoses.



The oil radiator was more dirty than the water radiator.



Here both radiators after cleaning them.



Here is the front mask in an AC equipped CSL.
It is visible that it is blocking a lot of air.



There are also these silly ducts (like in the efficient dynamics newer models that close when not going fast or stopped).



Just check here how much surface the fan base and fan itself are blocking.



I binned the fan and here is the end result (like in the non-AC CSLs).
The fan is 4.5kg so another weight saving.
The problem will be if you want to use the AC when stopped in traffic, but I don't mind as I never do this.



Also, I binned the fan and the fan shroud (more weight savings).
Another 1.8kg saved here.



Then I put the car back together and started it.
It will be interesting to see what happens next time I have a trackday and it is hot.

[shimmy]

Alex.........superb, you are a brave man,.

[alexk]

I have many updates on the temperature issue topic.

I will come back to you in a week or so.
Need to sort the bloody front top mounts etc.

[shimmy]

I have many updates on the temperature issue topic.

I will come back to you in a week or so.
Need to sort the bloody front top mounts etc.

Very interested to hear this.

I've recently swapped out my rad to a new OeM rad and also put in a new viscous fan clutch thingy.

[Graham]

Very interested to hear the outcome.

Does your a/c still work?

Visibly it looks like it will make a big difference to running cooler.

[shimmy]

Very interested to hear the outcome.

Does your a/c still work?

Visibly it looks like it will make a big difference to running cooler.

Or hotter

[Marv968]

There are also these silly ducts (like in the efficient dynamics newer models that close when not going fast or stopped)

Interesting.

How do these flaps work then? Are they attached to a servo?

[Graham]

Or hotter

I meant when driving along you'll get a lot more airflow to the front of the road :thumbs:

But it is the sitting in traffic bit that worries me

[shimmy]

I meant when driving along you'll get a lot more airflow to the front of the road :thumbs:

But it is the sitting in traffic bit that worries me

depends how that air gets channelled and directed as well.

[alexk]

13.07.2014

Not sure what to write first really.
I will try to summarize.

I changed the alternator. The voltage regulator that I had changed didn't help and replacing the whole unit was necessary.

I found an AC Schnitzer rear strut brace. It's fantastic because you can take it easily out if you want to fit something big. Used one, not cheap but it's what I was looking for all these years.

I ended up replacing:
- Radiator. Only 60% of the radiator was working... so ladies and gentlemen replace your old radiators.
- Thermostat. I put a new one. Feck it, warranty it is
- Water pump. Nothing was wrong with the old one apart from a very small play on the bushing. So prefered to bin it before it dies on it's own.
- Water hoses. Old ones were ok, but better safe than sorry. Would hate to have a blown water hose in the middle of nowhere.
- Fan clutch. Mine was fecked (again). Warranty again.

Before doing all the above I had some very strange overheating occurences.
The car would overheat (if you call 96C overheating) when on camber (the right side higher than the left).
I had overheating only on one specific place of the autobahn, while moving very slowly or stopped due to traffic. After days and days wondering why the car overheats only there, trying to understand what is special, I noticed I am sitting on a camber.
What is more funny is that I replicated the issue at home !
Car flat on the garage idling. No issue.
Jack it up from the right side and the temperature rose.
Take it down, temperature goes down.
I think it had to do with the clutch fan and whether it's engaging or not.

After replacing all the above, I saw only once the same occurence on the same spot of the autobahn.
The only things that would explain this are the following
- cracked gasket or cylinderhead which is creating pressure in the cooling system
- the water temp sensor is fecked OR the groundings of the engine have an issue

I am a very curious individual therefore I ordered a leak down tester tool.
Today I did a leak down test on the engine twice, just to verify the results.
Fortunately, the engine is in perfect condition and I have no issue in the cylinderhead or gasket.

What I will replace now is the water temp sensor.
I am pretty sure there is a problem.


Other news.

I will be selling my AP Racing kit and the Ohlins suspension and going to purchase a KW clubsport suspension and the Brembo GT brake kit (380mm / 6 piston front).
The reason is the ultra strict Swiss MOT :banghead:

[Graham]

That is very strange.

Also how do you know only 60% of the radiator was working and what do you think the reason for this is?

[Loaded_csl]

Other news.

I will be selling my AP Racing kit and the Ohlins suspension and going to purchase a KW clubsport suspension and the Brembo GT brake kit (380mm / 6 piston front).
The reason is the ultra strict Swiss MOT :banghead:

Alex can you explain me with a few words the Swiss MOT?

Thank you

[alexk]

Alex can you explain me with a few words the Swiss MOT?

Thank you

You don't want to have to do anything with them.-