Oil cooler diverter valve

[Mike RT4]

Mike

See other thread, I wasn't trying to catch you out, I'm not technical enough to know or remember tbh.

I think froUS forums they overcome the problem by ditching viscous fan, removing electric and fitting a high speed SPAL That is controlled by temp level s(and doesn't go off at speed)

But they do then occassionally get overheating at low speeds/traffic in hot weather.

Obviously the key would be to having both the data of the electric fan and viscous fan and see what CFMs these create when running together at slow speeds. And then see if this can be recreated by changing the switch on points in the map?

Perhaps switching it on at a lower temp will prevent it from climbing so rapidly. In my experience it is far easier to prevent the water temps from getting too hot, rather than trying to reduce them when they do .

[shane@mbtech]

Obviously the key would be to having both the data of the electric fan and viscous fan and see what CFMs these create when running together at slow speeds. And then see if this can be recreated by changing the switch on points in the map?

Perhaps switching it on at a lower temp will prevent it from climbing so rapidly. In my experience it is far easier to prevent the water temps from getting too hot, rather than trying to reduce them when they do .

Every little helps.

But I'm adamant on a track like spa for instance. The fans will be doing bugger all.

[shimmy]

Every little helps.

But I'm adamant on a track like spa for instance. The fans will be doing bugger all.

If BMW turn off the aux fan at 87.5mph then for 75% of the time that is off and the other 25% just adding abit of air flow

Viscous fan, I have no idea!

[AlexGTT]

Every little helps.

But I'm adamant on a track like spa for instance. The fans will be doing bugger all.

As Shane said, fan is fuck all to do with it. Only reason for any fan is to cool at standstill and very slow town speed traffic. Above 20mph when airflow takes over a fan is next to useless.

Ideally the solution is something like this but not really possible on CSL without major modification. Sealed inlets and outlets. Example not the configuration suitable for E46 but you get the theory.

[alexk]

What if we open outlets on the plastic cover under the chassis ?

[AlexGTT]

Not sure it would Alex. I think the whole engine compartment and undertray kind of act in a similar, if very inefficient way to the drawing theory, with exits at the rear of the undertray. Maybe opening additional holes will break what seal there is and make it worse? Don't know, just an idea. Might work if extra outlets far enough back?

[shimmy]

I've got a feeling that my next move is to try some extra openings somewhere (unless Lawsy finds a solution first)

Maybe we nee to meet at Simpsons in he spring, or at Lawsys when we go to Oulton to see what we can do.

Trouble is there are only 1-2 days a year that it affects and you can see the results.

[_Nathan_]

No need for any fans at all on track, and pushing air under the car isn't ideal IMO.

[AlexGTT]

No need for any fans at all on track, and pushing air under the car isn't ideal IMO.

Agreed Nathan but would ideally like to exhaust air post radiator. Easiest way is forward angled radiator with sealed bonnet exhaust but major alterations required.

[shimmy]

No need for any fans at all on track, and pushing air under the car isn't ideal IMO.

So my issue might still be the blocking of air by the fans and other shite in the way!

[AlexGTT]

So my issue might still be the blocking of air by the fans and other shite in the way!

I think that certainly contributes but also there's a coolant flow restriction. I've had something done about that and tested for a while but it's not a permanent solution yet and it's not ideal. Will do something to make it ideal if fully proven.

[alexk]

Agreed Nathan but would ideally like to exhaust air post radiator. Easiest way is forward angled radiator with sealed bonnet exhaust but major alterations required.

Yes. The engine is too long for starters.
A P60B40 is needed. :drool:

[AlexGTT]

Yes. The engine is too long for starters.
A P60B40 is needed. :drool:

Get on it Alex. I'm sure Gorilla will assist.

[AlexGTT]

I've got a feeling that my next move is to try some extra openings somewhere (unless Lawsy finds a solution first)

Maybe we nee to meet at Simpsons in he spring, or at Lawsys when we go to Oulton to see what we can do.

Trouble is there are only 1-2 days a year that it affects and you can see the results.

Harbour Café meet. Breakfast on Ant and Jules.:wink::whistle:

[shane@mbtech]

Harbour Café meet. Breakfast on Ant and Jules.:wink::whistle:

I'm dropping the m3 at Simpsons for them to reinforce boot and add some more rear cage bits. Will be end of February. I'll give you a shout when I know exact dates. :thumbs: