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Originally Posted by bracurrie
I started down this rabbit hole based on what I thought at the time was a need to rebuild my M130 MFI engine. I had heard about the hotter cam/richer mixture variant that produced 170 HP versus 160 Hp. Thought I would research what else was different such as pistons, heads, distributors and maybe injection pumps. It turns out that the variants of the M130 E are numbered in sequence from 980, 981, 983 and 984. 984 is the low compression varient 981 and 983 are the hot cam variants, but what happened to 982? I love a mystery.
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I would not expect the engine number to denote the horsepower, but rather to denote the model of the car it went into. The same engine numbers are used for US Spec 450sl cars with 160-190 hp, as the Euro spec 450sl cars with approximately 225 hp. When you select "North America" or "Europe" in the EPC, the parts used change. For example, the whole rear suspension on a European 450sl is different with the anti-squat/anti-dive rear end with aluminum control arms. The North American model has standard stamped steel control arms. The pistons in the European engine with the same number as the US engine just give you a different part number in the EPC. It would make sense that they gave them different motor numbers, but they simply didn't. In order to tell if a 4.5 of Euro or US, I put a scope in the spark plug holes to check the shape of the pistons.
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Past mb: '73 450sl, '81 280slc stick, '71 250, '72 250c, '70 250c, '79 280sl, '73 450sl, parted: '75 240d stick, '69 280s, '73 450slc, '72 450sl,
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