i'm installing the mosselman turbo kit in my 190e 2.3-16. i'm not planning on using mosselman's suggested setup for the oil supply and drain from the turbo and i need some help. because the intercooler goes where the stock oil cooler goes, mosselman suggests moving the stock cooler to a location below the bumper and cutting a hole in the front bumper valence to get air flow. don't wanna do that. i've removed my A/C condenser and have enough room for an aftermarket oil cooler in front of my radiator on the passenger's side. i'm going to run high temp/pressure tubing from the supply and drain lines for the stock oil cooler to allow me to use the aftermarket cooler as described above. because this location is near the turbo, i'm going to just plumb the turbo in series with the oil cooler to give it it's oil supply instead of following another mosselman suggestion which is to drill into my block for the oil drain. my question is, should the turbo or the oil cooler go first? if i put the cooler first, the cooled oil will have a higher heat capacity when it hits the turbo. if it put the turbo first, the cooler will be able to dissepate more heat before the oil goes back to the engine. the intake for the cooler will be just about the same height as the turbo and the drain from the cooler will be above the turbo.

so, any thoughts?

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dew
86' 190e 2.3L 16v

Well, I'm no expert but...
Isn't there a valve that directs oil to the cooler only AFTER the oil has warmed up? IOW, the oil cooler doesn't see oil until it's hot so your turbo will be oil starved until the valve opens.

Also, from my past experience with an old T04 turbo, the oil feed and return is much smaller than the oil feed lines to the cooler. I think the turbo would be a HUGE flow restriction whether it's placed before or after the cooler.

And lastly, the oil that comes out of a turbo is generally pretty well worked over and can be rather aerated. The reason it should be drained back to the sump is so that it stabilizes before going back through the engine/turbo again.

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Glen Tokuhara
Beauty & the Beast and the wagon that could!

Here is an idea.

First, you don't want to use the oil that goes or comes from the cooler. The cooler is thermosatically controlled and will not supply oil at times.

Instead, T off of the oil pressure sender.

Also, for the oil drain, take out the dipstick and drill a hole in it. Then have a banjo fitting brazed to it. Use a flex stainless hose for the connection.

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Benzmac:
Donnie Drummonds
ASE CERTIFIED MASTER AUTO TECHNICIAN
MERCEDES SPECIALIST 11 YRS

okay, thanks guys. that was just an idea. i'm going to use the new cooler still but the turbo will not be included in that circuit. . i'll try the banjo fitting on the dipstick.

this is why i love this site so much.

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dew
86' 190e 2.3L 16v

There is a picture of the oil cooler under the bumper on Alan's 16 valve page .

Be sensitive to the throttle binding when under boost. A new TB ($350) did not solve the problem for me. I am converting to a Mustang 5.0L TB and an SDS
engine management system to solve my throtle problems.

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Jim Villers
190SL, 230SL 5-speed, 95 E320 Wagon, 01 E320 Wagon, MGB, Boxster 'S', 190SL "Barn Find"