AndrewConn

I have been searching around and cannot seem to find much info on this. I am curious about engine swap possibilities for w204s. In particular I have a 2010 C300 4Matic and I am entertaining some options for after the warranty expires next year. I do not want to change any more than I have to. I have read that the m156 from a C63 AMG would require different front end parts (plus the engines are expensive). M273's can be found fairly cheap and I would imagine they could be a direct bolt in due to the fact that they are related to the M272 that is already in my car. I am wondering if anyone can confirm this?

Also, I believe the transmission should be able to handle the extra power this engine would produce, but what about the 4Matic system? I would prefer to avoid a RWD conversion but am willing to consider such a thing. Would the accessories at the front of the motor have clearance or would the front end need to be modified like a C63?

I don't want to race the car or anything, just want a little more power for not much money. I would also consider a supercharger or turbocharger kit, but I can't find many on the web. (It's also appealing to get rid of the 90 degree V6 as it just bothers me that it is not 60 degrees, no need to beat me up for this just one of my pet peeves). So far the M273 engine swap is the most economical way I have found (I would be doing most of the work myself) to achieve my goals.

What about non-mercedes swaps? I had a BMW 328i before this car and I remember that a Chevrolet LS engine was *almost* a direct bolt in (Google BMW 357i if you are curious).

centfl-c300spt

I've also been thinking about doing this swap in the future.
I've talked to my indy shop mechanic and he said yes. He's a master tech from a MB dealer and he actually called his friend still at the dealership to confirm this and he said yes a 350 engine will perfectly bolt into a 300 no problems. The trannys are the same. The only thing to change is the computer will have to get flashed, or if you are using a tuning program, they can modify the program.

I thought about stuffing a C63 V8 into it, but the front ends are completely different. You'd also have to buy the engine, tranny, computer, and wiring harness. It's so cost prohibitive, you might as well buy a C63 outright.

AndrewConn

centfl, I know the M272 3.5 Liter is a direct bolt in, I was wondering about it's larger V8 brother. The M273 is available in 4.7L or 5.5L versions and was installed in the following vehicles (from Wikipedia):

E47:

The E47 is a 4.7 L (4663 cc) version. Bore is 92.9 mm and stroke is 86 mm. Output is 335 hp (250 kW) at 6000 rpm with 339 ft·lbf (460 N·m) of torque at 2700-5000 rpm.
Applications:
2007– GL450
2007– S450
2007– ML450

E55:

The E55 is a 5.5 L (5461 cc) version. Bore is increased to 98 mm and stroke is up to 90.5 mm. Output is 388 hp (285 kW) at 6000 rpm with 391 ft·lbf (530 N·m) of torque at 2800-4800 rpm.
Applications:
2006– E500/E550
2006– CL500/CL550
2006– CLS500/CLS550
2006– GL500/GL550
2008- ML500/ML550
2006– S500/S550
2006–2009 CLK500/CLK550

hondastreet

Are you sure about what you are saying. It's does not sound logic that a 2010 C63 can't fit into 2010 C300. Both has the W204 shell, pretty identical, except regarding extended bumper / fender. The hood / grill wont fit. But the shell is identical I think.

mr.brightside

There's lots of threads of people with their V6's and 4 Cylinder Turbo W204s asking what they can do for more power & performance, followed by others telling them "Just get a C63!" But I think it's silly to say that too someone, it's great if you want to extract more power from your V6 or Turbo W204. This is really one thread where it's actually valid to say....Just get a C63!!!
It sounds so simple talking about it, but there must be a reason why you can't find anyone else on the internet who's done something like this to their C-Class if it's so easy and cost effective. IDK how much these things go for but funds for an Engine + Transmission + Tuning + all other unexpected costs would go better toward a down payment + trade in for a C63. But hey, if you end up doing it, I'll be the first to subscribe to that thread, lol.

Funkwagen

There's also the complication of the electronic pairing between transmission and engine ECUs. I'm fairly certain that without finding a way to defeat this, swapping in another engine will be difficult. The transmission and engine are "mated" and the car won't crank unless they're paired, apparently.

However, swapping in a different size M272 or M273 may be possible if the original ECU is kept, there's a parameter in the ECU variant coding to select engine size/type which might make things a little bit easier. I have the feeling it's not the complete solution or nearly that easy though; the fuel mapping/"tune" and such would be different for each engine. Swapping from a 272 to 273 would be even more complicated I'd think, since you'd be adding two new cylinders to an ECU which is only programmed to fire 6 of them. Unless that parameter makes all the required adjustments, which I doubt.

If only I had some spare cars and engines to play with to figure things out

I will say that swapping in a non-mercedes engine would be nothing short of impossible without changing the entire drive train, unfortunately.

hondastreet

So it's a financial issue.

I have in front of me an accidented 2009 C63 (rear damage) Cost $5k (no repairable car) it's a complet car.

I'm the owner of 2008 C350.

$5000 is a peanut for a nice upgraqde, and I will have everything, brake system, suspension, wheel, engine, transmission, sensor, everything on the picture !





Anyway, I dont want to bring the subject to an another direction.
If I buy, I will do a new thread.

I find it wierd that I am in the first to have this opportunity

Funkwagen

Hell, 5000 is decent just for a spare parts car Definitely worth more than that purely in parts, on the basis that most of them are okay from it being a rear end collision.

Oleimy

OMG that is an amazing deal buddy! I am trying to do the same thing but I would be swapping from a C250 2.5L engine to 3.0 C300 engine, is it possible ? or I will be facing some issues with that

Funkwagen

That will be easier, physically, it's practically a direct swap. However, you'll still run into the issue with requiring the engine and transmission to be "mated" to one another, so you'll have to look into local places that can possibly do that for you.

LandSeaAir

swap a 2013 C300 3.5 DI into a 2008 C300 M272?

superangrypenguin

I don't see how this would work.

And I don't see why this is a good idea. This is equivalent of swapping a heart that has malignant cancer for a smaller heart that is cancer free.

Until someone shows me an intake valve of a MB engine with DI after say 30,000 miles which is as clean as one that doesn't have DI after the same mileage, I'm staying the eff away from DI engines. (unless they're from Lexus as they've patented the use of both DI and PFI for the same engine)

Adi-Benz

This crossed my mind as well. Maybe throw in RWD trans as well.

LandSeaAir

Want to convert my 2008 C300 4matic to: M276 + 6-Speed Manual (RWD).

From daily driver, to second car, keeper. Like the options on my car, my mods, and the pre-facelift better than the post facelift... thoughts?

Just wondering if it is even possible to fit a m276 to a prefacelift car, not to mention 6-speed manual.

Omi

My car is a 2007 c230 v6 manual... got my engine broken so i tried to fix it yet pistons werent that good so thought it is time to upgrade her 😍

I found a c350 would that be a perfect fit for her.. and cuz it is very expensive i would really like to know if i will face any issues later??

Kompressor_5.5

C550 4-Matic without engine covers/air filter/TB.

C300 4-Matic without engine cover.

C550 4-Matic without engine covers.

C550 4-Matic with main engine cover.

CLK550 with main engine cover.

CLK550 with engine covers.

Kompressor_5.5

Also, I got some 2009 C63 Front springs and installed them on my original C300 coil-over struts. NOW the car isn't squatted in the front and the front end is about an inch higher off the ground.

Now the C550 completely looks like a C300. ABSOLUTELY NO VISUAL CUES! I don't want it to look like a gay ***, JDM riced out, lowered, cambered POS.

KiraC280

Wow bud, this is soo cool.

Can you post some video with the engine / exhaust sound?

C300Chris

I too want to see some videos, the thought of a ordinary "C 300" looking C-Class housing a 5.5L V8 is incredibly alluring to me, almost like the W210 E 55. Hell it'd be hilarious if you threw on some C 550 badging on the back as well, might throw the GTI or Civic crowd that always tries to race us at traffic lights for a loop when your car sounds like a C 63.

Kompressor_5.5

Kompressor_5.5

I will eat up w210 e55's all ****ing day. W210 e55's are hot garbage. Give me a real challenge. No up-badging. No visual cues. No hints. It's a sleeper!

C300Chris

Man, that's incredible! I'm assuming it was a relatively direct swap given the M272 and M273 being so similar? I'd do this myself if I had a good reason to... and a shop.

Kompressor_5.5

160,000+ miles and nothing happened.

I don't know where to begin because nothing has happened. Very point-blank.

I did an oil change with Shaeffer's oil. She seems to like all 11 quarts of it.

Upgraded the front calipers+pads+rotors to 2010-2011 W212 E550 4 Matic and upgraded the rear calipers+pads+rotors to w204 2009 C63.
5000 miles on the AMG pads and they're like a 1/3 gone. The fronts are fine.

Factory 17" twin 7 spoke rims. I bought 2 rear rims to put on the front. Now, I have 245/40R17 Michelin Pilot Sport All-Season 4's on all four corners. 3mm spacers upfront though.

I changed both front axles because they were slinging grease. Now a few months later, they're doing it again.

I replaced the intake because I had a code for it. And replaced the MAF because it was already out, I guess. I changed the spark plugs because I had no record of doing it. Obviously, none of these things have anything to do with the chassis.

I tuned the transmission. Added all the fancy modes. Made it shift wayyyyy faster. Changed out the gas pedal for one with a mechanical kick-down switch.

I changed the front and rear diff oil.

I still have the lower hose zip-tied to the sub-frame. For like a year. No rubbing issues. I'll have to get a different hose eventually.

Just basic, boring stuff. I have had no issues so far. STILL get 15 MPG. I use Shell 91.

Yep. That's that. Nothing much to it. ¯\_(ツ)_/¯

Kompressor_5.5

I broke the motor mounts