I had Paeco rebuild my W116 M117 to a stage 2 beast back around 2004, but not sure if they still do the Mercedes engines. Nonetheless, they can stroke whatever you send them.

MAKE OF CAR

 

if you don't mind me ask, what was the cost and final power output?

you had much maintainence issues after ?

thanks bud! :thumbsup:

 

Crankshaft knife edged
Connecting rods,crankshaft,mains,pistons and valves
were glasspeened.
Precision 3 angle valve job,ported,polished and
chambers contoured.
Chromemoly wristpins and chromemoly connecting rods
Aluminum pistons with Deves piston rings and knurled
piston skirts with oil bosses added
Overbore .040"
More aggressive grind on camshafts
Copper headgaskets
and a little this and that

Total cost $7800 + shipping

Ran fine, but fuel economy went south as to be expected. 0-60 was shaved significantly and throttle response throughout the range was top notch. I was unable to find a dyno at the time, as I lived in Alaska, but I'd say a modest 50-70 hp increase.

 

I was unable to find a dyno at the time, as I lived in Alaska, but I'd say a modest 50-70 hp increase.

OT, but, I think you are the first person I have heard of that has lived in both of the non-contiguous states. And sounds like it may have been back-to-back no less!

 

Moved to Hawaii in 2007, before that, lifelong Alaskan with the exception of being stationed in Ft Bliss back in the early 90's.

 

you meant to post you want one of these:

these aren't ls1/2 motors or 2jz that you can sandbox in your garage.

 

On the other hand, the AMG 7.3 L M120 is well known. I don't know how they get to 7.3 L. Overbore and stroke or just one or the other, but certainly the displacement of the 6 L block can be made bigger. I say go for it. I can't help you with who to talk to, but it sounds like fun.

Brett

 

To get the M120 to 7.2 liters, maybe you can use the pistons that came with the W202 C36 (M104 engine), I'm not sure of this info, maybe others can chime in.

 

Not a bad idea! :thumbsup:

 

Piston's don't change displacement. Bore and stroke do. Pistons can change compression ratio. But, now that you mention it, there's a good chance that the modifications to get the M120 to 7.3 L were based upon those that got the M104 to 3.6 L.

Brett

 

I am not too sure, but you can also use the intake camshaft of the W202 C36, for the M120, which is a little bit more aggressive (lift and duration).

The C36 pistons might be cheaper from OEM suppliers than the MB OE pistons.

I wonder if the 7.3 M120 had a "stroker" crankshaft, or was it just the pistons from the C36 that bumped the displacement, as the 600cc variance from the 3 liter to 3.6, as those x2 = 1.200, from 6 liter to 7.2 liter?

 

Considering they use this engine exclusively in Zonda cars, in 6L, 7L and 7.3L form, I'm sure it would be possible.

It's just that the money you are going to throw at it, might not be worth it.

 

No. they use the AMG version with more internal mods atop that.

the base non tuned engine was sold in 3 cars! *3*

 

It seems to me completely possible that all there is to the 7.2,7.3,7.4 engines is the usage of C36 parts after strocking. Even in the zonda. AMG "tuned" that engine.. as they have worked on the M104 to make that C36 engine.. why not use those parts again.
That opens a nice door for DIY mods.. M120 owners could go out there and, if doable,switch camshafts for example for a more aggressive tuning

 

Plan on spending $50k or forget about it. Silicone and aluminum are not easy to work with. Get in touch with Atec Motorenbau, if you speak German. You also might want to think about how you're going to get air to all that motor. My S74 never had enough air or fuel--even with the RENNtech ECU's. You also have the trans and cooling system to think about. Good luck!

 

He's right about this! Air and fuel delivery are essential
Cooling could be an issue if you plan to drive it hard for more than a few secondes
Trans mods: if I remember well Renntech offers a complet Tranny rebuild to withstand 800hp/1000nm torque or something around this for 3000$

Mb_Fahrer what does you air intake system look like now? I'm definitly annoyed about the OEM air filters and don't want to go K&N

 

This may be total nonsense, but I'm sure I read somewhere that the M104 3.6 engines started life as 2.8 and essentially used the crank from the om606 engine to stroke the capacity to 3.6.

The 3.6 in the w124 also had porting and polishing from the factory.

I would imagine AMG could still do a conversion. After all, they were still selling the m120 7.3L to Pagani until last year, and probably still support those engines in terms of spare parts.

 

Old thread, but since it's back up here, I'll leave this link. See the item on the bottom of the page. They do speak english. Prices are reasonable (read: probably a $40k engine?).

MKB Tuning Produkte