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1981 300TD 360k--1966 230 165k--1970 280se 172k
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647 Posts
Discussion Starter #1
For sure, engines have quirks, personalities, and histories. Part of getting to know (and love) my '66 230 is learning about the m180.945 that came with it.

For my class of car (110/111) I see that the straight six came in 4 displacements. Were these all m180 motors? Also, what characterizes the differences between the last three digits in the motor number? Were all the 180s alloy heads? Are all the heads interchangeable? Why does the 230 and the 230S have the same displacement and compression ratio, yet the 230S has more horsepower? Maybe the carburetion?

I'd love to hear from everyone having experience with these motors.
 

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90 300 SE ,85 300 GD
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1,574 Posts
220S 1959-1965, 6 cyl.overhead cam. M 180/ 80 X 72.8mm (3.16 X 2.87 in) 2195 cc (133.9 cu in) 110 hp (DIN) @5000 rpm (124 hp SAE @5200 rpm) 8.7:1 compression ratio. 2 dual downdraft carburetors Solex 34 PAJTA.

220S 1959-1965, 6 cyl overhead cam. M180/80 X 72.8mm (3.16 X 2.87 in) 2 downdraft carburetors Solex 34 PJCB.

230 1965-1968 6 cyl overhead cam (M180) 82 X 72.8mm (3.23 X 2.87 in) 2281 cc (139.2 cu in) 105 hp (DIN)@ 5200 rpm ( 118 hpSAE @ 5200 rpm) Compression 9:1. 2 downdraft carburetors Solex 38 PDSJ.

230S 1965-1968 6 cyl overhead cam (M180) 82 X 72.8mm (3.23 X 2.87 in) 2281 cc (139.2 cu in) 9:1 compression ratio. 2 dual downdraft carburetors Zenith 35/40 INAT. 120 hp @ (DIN)@ 5400 rpm
All had aluminum heads.
Hope this answers some of your questions about the M180 engines. They also used this engine in the 404 S UNIMOG truck. We owned a series of these, 1964 220Sb, 1965 220S, 1964 220SE Coupe, 1966 220SE Sedan and a 1968 404S UNIMOG.
 

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Registered
1981 300TD 360k--1966 230 165k--1970 280se 172k
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647 Posts
Discussion Starter #3
Thanks for all the info! So it looks like the head on my '66 230 is specific to the 230/230S from '65 through '68.

Since you've owned so many of these sixes, how would you describe their overall nature? Typical problems, wear items, etc.
 

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90 300 SE ,85 300 GD
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1,574 Posts
Poor mileage by today's standards! 10-11 city, 15-16 highway. Rust around the top of the headlamps because of dirt buildup underneath--no splashguards. Floorpans rust out. Windshield tend to leak at the corners as the rubber seal ages. Verticle speedometer has confused some. I liked it! Carbs leak if not serviced, drips onto manifold.
Because no one considered these "Collectible" there are few in good condition on the road, now they have become VALUABLE as collector cars! The most collectable is the "Estate" or wagon body by BINZ. This was mostly the 230 model used in Europe as both an ambulance and a hearse. Few were imported into the USA. The cars are heavy and are certainly safe as they were crash tested as early as 1959. If I could find a nice one I would certainly hang on to it as they prices are climbing steadily now.
 
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