W114 Engine seized - Engine swap? - Page 2 - Mercedes-Benz Forum

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post #11 of 16 (permalink) Old 08-27-2013, 09:44 AM Thread Starter
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Date registered: Aug 2013
Vehicle: 1970 Mercedes 250C
Location: Stockton
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Hey Brett,

How did you settle on which engine to use in your swap? I am considering a V8 from a 500SEL for my 70' 250C. What are the major pitfalls? How do I determine which drivetrain would be the best fit? Does wheelbase play a factor? Thanks!

Kin
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post #12 of 16 (permalink) Old 08-27-2013, 11:30 AM
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Date registered: Mar 2011
Vehicle: 1971 250/8 sedan with 80 K miles. Driven only in Summer.
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Hi Kin. There are two conversions mentioned in the STRICHT ACHT Forum in Germany using a 4.5 L into a 250/8 . Both cars have since crashed and do not exist any more. That kind of power was not meant to be in our cars, as the top speed with the 2.8 engine is 110 m/hr and enough to test your driving skills. Harald
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post #13 of 16 (permalink) Old 08-27-2013, 05:42 PM
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Date registered: Jun 2010
Vehicle: 1966 MB 200; Porsche 914 (6); Porsche 914 (Chev 350); 36 ford
Location: Sunnyvale, CA
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I selected the C230 running gear as it closely approximated what the factory had originally designed. And I felt the C230 was a descendant of the 200, hence wanting to make it a modernization of the 200. I felt the weight balance, suspension and brakes would be what the original designers intended.

I also wanted a car that was nimble, braked well, accelerated well, and was pretty good on mileage. And a part of me wanted to do something that had not been done yet. (That I know of!) Part of my design goal was to not build a muscle car or hot rod. Just a car that looked vintage but rode and drove like a C230

By the way the car is running and road tested. I am to pick it up next week. I will continue to tune it, and get the suspension sorted out before starting on the cosmetics.

If you are in the area, I can take you out for a ride in it.
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post #14 of 16 (permalink) Old 08-31-2013, 06:55 PM
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the 250/8 engine compartment is pretty narrow and v8 is just large. A more elegant swap is something like the M110 motor. A 280e or 280se from the 70s would be a good thing to find. An M103 motor would work as well, but you'll have to plumb lots of wiring. -CTH
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post #15 of 16 (permalink) Old 08-31-2013, 10:06 PM
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Date registered: May 2013
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"the 250/8 engine compartment is pretty narrow and v8 is just large."

cth350,

Just for fun I measured the width between the hood sides on this Gen 1 350 small block Chevy powered roadster. At the front (narrow) end the hood sides are 21 1/2" apart. That easily accommodates the engine with common "block hugger" headers.

Domestic small block V-8 engines seem compact enough to fit just about anywhere. There are even front and rear oil sump versions to accommodate various cross member and suspesion component locations. And the prices of aftermarket engine components, particularly for the ubiquitous sbc, are probably equivalent to the sales tax on the same part for a Mercedes.

Ray W
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post #16 of 16 (permalink) Old 09-01-2013, 08:24 PM
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Date registered: Jun 2010
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It's funny you mention the m103 engine. Before I chose the c230 engine, I spent a lot of time researching including time in a junk yard with a measuring tape. :-)

The m103 would fit with a lot of work, but I found the dhoc m104 (217hp) was about the same length. I was thinking about it for a while.

As for the wiring, I would have used megasquirt, which is pretty easy to use. You can get by with only 4 wires for the fi sensors, and then just wire up the injectors and ignition.

--brett
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