Possible engine swap - Mercedes Benz SLK Forum

Performance MODS for the R171 Tuning and Performance modifications for your SLK

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#1 Old 01-26-2015
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Possible engine swap

Hello all,

I live in what you would call a high cost country, and our car taxes are insane!
I paid more for my '05 200Kompressor than the cost for a 2010 55 AMG(that hurts)

But there is a minor loophole. Every year the taxes on cars, such as "horsepower tax" and other taxes are lowered by 10%. Which means that now that the car have been registered in Norway for ten years, I can upgrade, swap engines and increase horsepower without having to pay anything to the government

I already have the max amount I think I can get out of the little 200k without having to turbocharge it or increase cylinder bores.

This is where my question comes in... Does anyone know how hard it would be to swap my engine for a second hand 350 engine?
The reason for choosing the 350 engine is because then I dont have to change my gearbox at the same time. As acording to my dealer the 200k and 350 uses the same gearbox.

Ive looked on ebay for a second hand engine for a while and have found a few. But none of them comes straight off of a SLK. Most of them either come from a E350 or a C350...

Is this the same engine, and would the swap be more or less "plug n play"?
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#2 Old 01-26-2015
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The 350 engine is what is commonly referred to as a "corporate workhorse" - it is a mass produced engine made for a wise range of the Mercedes-Benz lineup of cars. Chances are that it should be a "plug and play" swap, my only concern would be engine mounting points and tracking down an ECU.
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#3 Old 01-26-2015
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This question has come up before.

Yes, the 350 will fit into the SLK engine bay. I think though this will be the only easy part!

As Akonion says, it will be mounts and ECU - but on top you will have a myriad of other things from clips through to radiator cowling, hoses and exhaust front pipes etc etc. Do not be complacant about the gearbox swap either - yes it may be fine, but are you talking the same type of box? Using another box 'might' need a different back plate.

If you have good workshop facilities, time and dedication you will do it, but do try to get as mucha as possible included in the engine you buy. Oh, and get yourself a good source of p[arts at the right prices...
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#4 Old 01-26-2015
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Might be cheaper to buy a used 350 and apply the mods from your current car to it. This route will definitely more likely result in a running car than the alternative!
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#5 Old 01-26-2015
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I'd take the engine I have and send it to an engine shop for some updating. Do you have any MB engine specialists?

An engine swap could be done, but hooking up the ancillary stuff would be a nightmare.
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#6 Old 01-26-2015
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I'm with DSSG, look into what you can do to the current engine. A supercharger with greater flow capacity might be an option, along with a bigger intercooler and higher-rate injectors. Going all in would mean boring out the cylinders to 2.0 liters or more...maybe there some parts in the bin for the A/CLA/GLA 45AMG that could be fitted instead. Not cheap and not simple, but at least all the connections you already have would remain or be altered only minimally.
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#7 Old 01-26-2015
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Coming at it from a cynical view - why in Norway would you want to extend the power? If anything I would have thought you would want to de-tune your cars! Am I correct that you have a 50/80/110kph limit system with high infraction penalties?

Here in France we have 50/70/90/130kph and really, I have to admit the standard 200 is quite adequate and wonder why I spent so much money on 55s and 60s in my past..! I guess though this is what ageing does to one!
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#8 Old 01-27-2015
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i think you better search for a crashed 350slk, so you can get the whole electrics from it......engine swap can be a nightmare

Last edited by Nikken; 01-27-2015 at 09:32 AM.
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