Quote:
Originally Posted by 2phast
300ce M104 put out 217 hp, 300sl/300se M104 put out 228 hp.
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104.981/ 980/ 990 CIS-E engines, if I understand correctly, are basically a mechanical injection system with electriconic control, using a distributor with one coil wire and 6 spark plug wires, whereas the M104.992 engine is an HFM-SFI system (hot film mass air flow sensor with sequential fuel injection), combining fuel injection and ignition control in one module.
These 3.0 liter M104 engines might be advantageous because they are simpler. They don't have an expensive throttle actuator which are prone to failure, as well as not having the infamous deteriorating wiring harness problem.
The later 3.2 liter M104 engines have variable valve timing on the intake cam, which gives them much more torque, making the torque curve broader and flatter, developing more hp at a lower rpm, making the power more usable and noticable.