I had to replace the engine in my 04 Coupe. I choose to go with the 3.7l for an 04 S350. Swapped the engine harness from the 3.2l engine over to the 3.7l.
So far no issues and the car feels much quicker. Feels like it has more low end pull.

 

Are the blocks the same, did you have to modify the harness? What is the engine rated at for HP? ( you can't beat cubic inches!)
Dan

 

The 3.7l is the same engine as the 3.2l just bigger. All that had to be done was use the sensors and engine harness from the 3.2l

 

Feels that way, because it does

HP/TQ rating for the 3.7 is 245/254, respectively (compared to 218/232 in the 3.2).

I would hazard a guess that all NW intakes, headers, etc would bolt up as well. It's just a longer stroke.

 

Same stroke, bigger bore.

What happened to your 3.2 engine?

 

You're right -- I got it bass-ackwards

Per Wiki:

"It retains the 84 mm stroke of the E320 but is bored to 97 mm"

Cheers,

 

I am guessing the internals would not be up to a supercharger install ?

 

Nope, nothing close to what the SRT blower cranks out (14 PSI factory).

I think the most you can go on stock N/A internals is around ~7 PSI, based on my recollections from the MB forums.

Before I would go through the trouble of swapping a 3.7 and force-feeding it, I would pay someone to do a 550 V8 conversion.

 

very true ,sadly the blown 5.4 Amg motor is Not Allowed in a crossfire here in the Nanny State of Australia. Too much power for it they say .
ha phooey i say .

 

550 V8 = naturally-aspirated, ~350 hp depending on the donor vehicle from which it's taken. S550, E550, etc.

55K = Supercharged V8, between 469 and 490 hp depending on donor vehicle (SL was more than E55, for example).

 

Well i am nearly there at those figures (cp) , i just have to find another 80 horses somewhere .
hmmm...

 

Any updates? By swapping the harness... does that mean you had to splice it and adapt it or it's a straight swap? Did you weight the car before and after? Did you have to do any tunning? Where are you located? I don't think we have this engine in North America but I would be interested in importing it.

 

I have not done it, but I don't know why you would have to swap the harness, it is the same engine, just a larger bore. Same in every way but the bore is slightly bigger.

 

Ok. It seems like the ML350 would be the vehicle to have this engine. These engines are very cheap at the junk yard. Like 500 to 700 bucks!

 

as long as it is a m112 engine, the m113 that is the v8 that have been swapped is the same engine family.
if the coding could be done at a resonabe price I sure several ppl would be sending off the computer to be coded to a 5.0 or 5.4 m113.
hell if coding was at a descent price I would already have a 5.0 in front of my 6 spd....

 

It would mess up the weight distribution. The 3.7 seems to be the way to go for a sports car. That's what they should have used from the factory.

 

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not much difference both being full aluminum blocks and heads vs other cast iron engines.

 

It's longer and has more internals. It definitely puts a bit more weight at the front. I don't know if it's really significant but still. The 3.7 swap seems really cheap and straight forward. I also own a 6 speed manual so no hassle with the ecu needed.

 

What do you do with the mechanical fan?

 

the m113 is only 330 lbs and the monster v12 is only 490 lbs