No ECM tweeks?

 

OP curious as well.

If none were done then I would be curious how A/F is...

 

No ECM "tweeks" ... that said ... if you were to cam and tune this engine you'd be right around the 300hp mark

A/F is right where it should be ... a tad on the rich side once it settled in. Pulls like a screaming badger

 

So the stock 3.2 ECU can compensate for the displacement? hmm

 

When upgrading almost any engine the key is balance ... for example the 3.7L M112 has not only larger displacement but larger injectors to compensate for the extra volume of air. Since the injectors where already sized for the 3.7L ... all the ECU had to do was do a little fine tuning and balance out to 1 Lambda. At the moment it's running .960 and .980 (left/right bank) which is nearly perfect (just a tad rich). These engines can compensate for quite a bit in either direction air/fuel. By comparison my tuned 3.2L is running a bit lean with a 1.20-1.60 Lambda.

And I have you to thank for it sk8erjosh ... I've read for years about "everyone" doing the V8 swap and was seconds away from pulling the trigger on a real nice low mileage 113 and ECU after reading your first few posts. But, got to thinking and playing around at work (helps when you have all models of MB's to play with) and realized that the main reason no one as done this swap is because no body really knew these engines existed. With all the high HP SRT's out there you could even do this swap and boost it... as AMG makes forged pistons for this engine.

 

Interesting, well I'm glad it's all working out well. Makes sense that with the bigger injectors it would make up for the extra air.

If you could lower the compression, add in forged internals and boost it that would be one hell of a motor. I was thinking of something similar before the V8. Bore and stroke the C32 block I have. The only reason I didn't is the fact that I really really wanted a V8 lol.

 

I'll probably be looking into one of these motors once I get back to the states. Hopefully they will still be easy to find. Maybe one day there will even be a turbo kit figured out I'll be out here for another 2 years so hopefully someone figured it out by then.

 

Yes, if anyone here is going to do any MB engine swap make sure it's '04 or up!! There were huge material upgrades starting in '01. The 04-05 ML 350 and 06 S 350 are the 3.7L M112 ENGINES......... Which did you use as a donner engine? The ML or the S? I understand there are some differences in the front of these engines which affect how easy it is to mount up the accessories, etc. Thanks

 

Welcome to the forum!

Curious though, what materials were upgraded? I have yet to see a different part # between the '03 500 and '04 320 engine's...

Also, what would be different between the S and ML 3.7's for accessory mounting?

 

I used the 3.7L out of an '04 ML ... as far as the accessories go the ML has a different tensioner pulley and I believe one or two other pulleys are a different size as well. I just swapped over all accessories and pulleys from the donor Crossfire engine... if you were to look at the stock Crossfire 3.2L to the ML 3.7L after I swapped all the accessories and wiring harness over you would not be able to tell them apart.... the look identical.

As far as the material upgrades go.... basically MB found that too many people were still using dino oil in there new engines and a lot of the small oil passages were getting clogged with sludge as people were going 7-10k between oil changes on dino oil... as well as a few other things like the crank shaft seals going bad prematurely, etc.

 

I am so, so, sorry I missed this thread. But at least I get to read it to the finish mark. Kudos to you, sir. Any chance you'll have that thing around OC for the Spring Cruise?

 

Well since you're in the reading mood... try this:
https://www.crossfireforum.org/forum...ject-69-a.html
Been so busy with this project that I haven't been to hardly any gtg's... soon to change... sadly not with this one.

 

Interesting, the Star EPC doesn't list differences between 03 and 06 SL500's... My understanding is the 320 crossfire engines are the same as well up to 2007, when Jim just found out they changed the crank bolt pattern for the flywheel/flexplate. I'll do more digging in EPC and see what I come up with.

 

I recently bought a XF off of a past member. Car has 160k miles on it, the clutch is going and there is a slight knock at idle. I've already dropped the car at the mechanic to do a 3.7 swap. I should have my new LUK clutch tomorrow and I'm shopping for a motor to buy within the next week or so.

Any advice on buying the used motor? I'm looking for a motor with 100 miles or less, an 03-05 ML350 or 06 S350 engine. I think as long as I get a used one with warranty that has been tested running and for compression I should be ok..

I told the guy who's doing the swap that it's pretty straightforward except for the mechanical fan. Is that correct? Anything else I should tell him?

 

safrick, forgive the delayed reply, sounds like you've done your research. You are correct about the mechanical fan clutch as there is no need for one as our chassis utilizes an electrical cooling fan. The only thing that's required for the engine to run (easily) is to swap the engine wiring harness from the crossfire's 3.2 to the ml/s 3.7, it's plug and play.

Keep us posted on how it goes!

 

Good to hear from you and glad it's not to say something changed on your end and I'm making a big mistake!

I started a new thread named Another 3.7 Swap so I'm not confusing your swap with mine. Mine still isn't a success yet!

I do have the motor and should be progressing soon now..

 

Does anyone know if the flywheel from my six speed will bolt up and work with my new motor? The mechanic wasn't sure if even if it fits, if it is balanced correctly. Seems like it should be fine to me.

 

They are both the exact same motor, only difference is cylinder bore.