Date registered: Mar 2005
Vehicle: 98 Brilliant Silver
Location: Atlanta GA, USA
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All M113s have aluminum engine blocks and aluminum SOHC cylinder heads. The cylinders are lined with silicon/aluminum, and the heads have 3 valves per cylinder. Other features include SFI fuel injection, fracture-split forged steel connecting rods, a one-piece cast camshaft, and a magnesium intake manifold. The M113 E50 is a 5.0 L (4966 cc) version bored to 97 mm and stroked slightly more than the E430 at 84.1 mm. Output is 306 hp (228 kW) at 5600 rpm with 339 ft.lbf (460 Nm) of torque at 2700 to 4250 rpm. Active Cylinder Control variable displacement technology is optional.
The M119 5.0 L (4973 cc) version produced 326 PS (322 hp/240 kW) at 5700 rpm and 354 ft·lbf (479 N·m) at 3900 rpm. Later engines had the full throttle enrichment removed and power was a little less, nearer 315 PS (311 hp/232 kW). The M119 was was a double overhead cam design with 4 valves per cylinder and variable valve timing on the intake side. It was replaced by the 3-valve M113 starting in 1999.
Now about this discussion of HP and torque
HP = Torque x rpm/5252 or if you speak that metric stuff, KW = torque x pi x rpm/30000
If you increase power you increase flywheel torque, always. Look at the HP and torque vs rpms and you will see that as rpms go up the torque and HP curves look identical just offset by the rpm factor.
The M113 has a broader range for high torque values but it does not have higher torque. It is indeed a lighter engine, after all it is a SOHC vs the M119's DOHC and it has just 24 valves. Being lighter it is somewhat quicker to repond. It also reaches its torque band quicker since it has a broader range. All in all, the M113 should have quicker low end acceleration. The M119 , if not electronically limited, has a higher top end and better high speed acceleration.
The M113 has been criticized by some as having all the benefits of Mercedes design and all the negatives of Chrysler quality. That is probably not fair since all of the non-AMG M113 engines are made in Untertürkheim, Germany. However I have a number of friends that have the M113 and they honestly do seem to have more problems than my M119. My 98 now has 92K miles on it and has had no repairs other than tires and brakes.