I found this on the mb forum what do you guys think?

How much HP&boost can the 3.2&3.7 cylinders handle?

Would much ecu tuning be needed since it will still b a m112 engine just a little bigger?

Might b a good option for the people who want a boosted v6 instead of a v8? More daily drivers with moderate boost?

"hi..guys i found this C32 extend 3.7L, C37 AMG

use 06up s350*Cylinder*head, cylinder block, and they are 100% fit C32 OEM cylinder base, Oil pan, from 3199c.c extend to 3724c.c, Schrick Hi-Cam, E55 Forged Pistons, Whipple M6066-M463 superchage, head,Turbocharger Pulley kit,crankshaft*Pulley kit. catback downpipes,exhuast, 550WHP."

 

the 3.7 has more hp from 332 to 340 depending on the year, the limited crossfire has 215, the cost of swapping for that small increase may not be worth it, as far as ho you may want to remember that Chrysler had to down grade the horsepower on the srt6 from 350 for the slk to the srt6 . maybe you could gain the hp you want with mods,, looks as the gas mpg is very close.

 

The 3.7 is only 30 HP more then 3.2 but the 3.7 also has a mechanical fan. But I would want to change pistons to 8.5:1 how much boost do you think the 3.7 cylinders handle?

 

A point of correction. The limited Crossfire only has 215 hp, not 315, so if the 3.7 is over 300 hp then a swap would have significant increases.

The SRT6 has 330 from the factory so if you are comparing an SRT6 to the 3.7 then I'd say you are correct, a swap makes no sense. The SRT6 hp, while downgraded from the merc AMG SLK version, didn't actually mean it the SRT6 didn't the the HP or the potential for the HP that the AMG had. Many say it was just a paper reduction and not an actual reduction. Anyway, seems your options are to buy an SRT6, or an upgrade would be in the cards if you are really looking at upgrading a limited, which only has 215 from the factory.

Have fun.

 

Good points. You beat me to the correction on the limited @ 215 HP.
Yes, many believe it was a paper change on the AMG/SRT as well as the SLK320 @ 225 HP and the Crossfire Limited at 215 HP. Which lays questions on the mathematical projections often made....including mine.


I agree with your premise here, a swap makes no sense. Especially given the proven potential of the existing power plant in the SRT. But for the right guy wanting to do something different, have at it.

 

Think he's talking about boosting the 3.7.
So how much horsepower are we talking?
Probably more than a "turbo'd" XF for sure!

 

I went from a superchargered v6 with over 400 crank hp (350) at the wheels to a v8 which is 500+ at the wheels, because the v6 could do no more without opening the engine or add nitrus.
My V8 engine is stock, the added mods are tune, pulley, exhaust, killer chiller and intake.

 

3.7 is 245 with a mechanical fan NA.
Want a twin from mount turbo v6.
Move the throttle body away from the back and move the engine and trans back the 6" and use a one piece driveshaft. More weight on the rear tires.
But still a good daily driver withe the v6. And better mpg then a boosted v8. And in bad weather easily turned down for better drivability on wet/slick roads

 

Proving that a RUDY transplant is the simpliest, most reliable way to get there.

 

I have a n/a 6 SPD and looking to build another engine. Wanting turbos over a blower.
Turbos use half the horsepower to boost then a supercharger requires and turbos have more tunability and drivability.

I only drive it 2 days a week and some on weekend but still put on average 600 miles a week.

3.2 and 3.7 m112 engines have a forged crank and rods. I have heard the factory forged lower end is good for around 90 HP per cylinder. But the coated pistons will have to go anyway.

 

I don't think Turbos have had much success here with the Crossfire. It's cheaper to just buy an SRT. As a result there is likely a predisposition against that route.


That aside,,,,,
Since you are a stick shifter, the Turbo is attractive. I see where you want to go here. If the project isn't too challenging then go for it.

 

I trying to figure out how much HP/boost the 3.2 and the 3.7 cylinders can handle safely.
The 3.7 has the same stroke as the 3.2 but a bigger bore, so it has thinner cylinder walls then the 3.2.
I not building a dedicated strip car. Better on a road course and still a daily driver.

 

Does any one know what the bore and stroke is on the 3.2 and also on the single cam (2003 and 2004) 3.7 from an ML350? I have the parts (srt/amg) to build a 3.7 SRT except the 3.7 short block. If the stroke is the same I would not even need a 3.7 crank. I would sell this part collection to some one who would really do it and not procrastinate like I do. You can PM me or call me @ 210 648 5779.

 

The*E32*is a 3.2*L (3199*cc) version. Bore remains at 89.9*mm but the engine is stroked to 84*mm. Output is 218*hp ECE (160*kW) to 224*hp ECE (165*kW) at 5700*rpm with 315*Nm (232*ft.lbf) of torque at 3000-4800*rpm. It has fracture-split forged steel connecting rods.

The*C32 AMG*is a special version of the 3.2*L (3199*cc) C320, fitted with a helical*twin-screw*supercharger*and water-to-air*intercooler. The supercharger was developed in conjunction with*IHI*and features*Teflon-coated rotors producing overall boost of 14.5*psi(1*bar). Output is 354*hp ECE (260*kW) at 6100*rpm with 332*ft.lbf (450*Nm) of torque at 3000-4600*rpm.

The*E37*is a 3.7*L (3724*cc) version. It retains the 84*mm stroke of the E320 but is bored to 97*mm. Output is 235*hp ECE (173*kW) to 245*ECE (180*kW) at 5750*rpm with 254*ft.lbf (344*Nm) of torque at 3000-4500*rpm.

Applications:

2003–2005*ML350
2003–2006*S350
2003-2006*SL350

 

Since you guys are talking about boosting the m112e37, check out this thread:

My New Project - MBWorld.org Forums

Its a crazy mixture of m112 and m113 parts with the m113k SC mounted on top of it all.

 

LOL okay... You're stock but you increased boost, had it tuned, aftermarket exhaust, etc, etc

 

LOL yes I see that now , what i was tring to say is my engine has never been opened, the added mods are bolt on. thanks for letting laugh at myself. jim

 

I see nothing wrong with what he said.
He spelled out what it was, stock engine plus additions.