AgSilver

Quite frankly, looking at the original AMG design, I cannot see how any coolant from the engine circuit can enter the I/C circuit. There is no route to allow engine coolant to flow into the I/C circuit. Further, the internal pressure is a constant factor. That said, obviously a split system is required with a dedicated coolant tank.

Gadget

The stock E55 has the intercooler and engine cooling system linked together.

This allows the two system to share the same expansion tank.

The intercooler system is filled from the engine cooling system. Once filled and bled there should not be hardly any coolant coming from the engine cooling system into the intercooler system, but they are still connected together.

On some of the other cars, I see that bleed fitting on the return line is routed to the expansion tank. With that system there will always be a very small amount of engine coolant entering the intercooler system as it is replaced from the small amount bled off of that bleed line.

To say there is no way for the engine coolant to enter the intercooler system is not accurate. After all that is how the system is filled in the first place.

The question is how much of a difference splitting the system makes on the E55. I will be there is a difference, but not as much as you might think.

G

Roverron

Splitting also allows you to run different chemicals for you cooling needs or none at all.

typhoon43

DING-DING-DING!

Being a Floridian, I run nothing but distilled water and a little Water Wetter to keep the pump lubed in my IC circuit.

JoeNobody

I'm going to try sealing the open air vent on the BMW brake reservoir, and then drilling and sealing a 7-15 psi vent:

http://www.ebay.com/itm/Pressure-Rel...-/161098491498

Then the brake reservoir should behave like an actual coolant reservoir.

Donny Linton

wheres the pictures?

MSG 55G

5 years late into the conversation Donny.