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Old 02-24-2002, 08:22 PM
MikeV
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Difference between 72 250c & 73 280c

I'm working on putting together a deal for a 72 250c with a bad engine 144K ...$800 and a 73 280 c parts car for $400. Are the simolar and will th parts be interchangeable? The 250 was run without oil and sounds like a bad crank If I rebuildit myself what am I looking at for cost for materials?

P.S. Thanks Mark for all the other info.

Mike V

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Old 02-24-2002, 11:37 PM
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Join Date: Jan 2001
Location: Alexandria, Virginia
Posts: 5,480
Mike,
You should take a look at both engines before you buy. Maybe even take notes and photos. The 250C has the single cam M130 six and the 280C has the twin cam M110 six. I don't think any engine parts are interchangeable. As to swappng engines, you need to see how much of the accessories, motor mounts, wiring, plumbing, exhaust system, etc, you will need to convert to fit the later engine. Can you run that 280C engine before you buy? Make sure it's reasonably quiet and has good hot oil pressure.

Happy Motoring,
Mark
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Old 02-24-2002, 11:52 PM
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Join Date: Jan 2001
Location: Alexandria, Virginia
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Mike,
You should check out the 'Fire wall cover question' thread on this forum. There's a discussion on the M130 vs M110 engines on the second page.

Happy Motoring,
Mark
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Old 02-26-2002, 03:36 PM
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Being the lucky owner of each of these cars, I feel well-qualified to discuss this. I had the opposite problem - good 130, bad 110. I looked into putting the 130 in the 280C and decided to fix the 110.

Comparing the 280C with the 250C:

The intake manifold and carb are on the left side of the 110, not combined with the exhaust on the right like the 130.

The battery is on the right side, not the left.

The 110 has completely different throttle linkage.

The air cleaner plumbing is different

The emissions stuff is completely different and the 110 uses a vacuum pump mounted on the front of the right camshaft to keep it all working.

I am not sure about the interchangeability of transmissions.

The major hassle would be moving the battery. The 280C's tray is bolted in, but you would need to fabricate the mounts on the right side of the 250C. The tray on the 250 is welded in and would be a PITA to remove. There was a swap like this on e-bay and the battery ended up in the trunk.

Finally, the '73 M110 is not exactly the peppiest engine around, especially if you have the 120 hp California version. I would go for either fixing the 130 or finding a used engine. You could probably get a decent one for a few hundred bucks.

Chuck

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Chuck Taylor
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'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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