M103 with 5 speed in 1970 W108 280SE - Mercedes-Benz Forum

 
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post #1 of 4 (permalink) Old 10-02-2015, 04:18 PM Thread Starter
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Vehicle: 1970 280SE, 1991 230E ,1988 300E
Location: Gällivare Sweden
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M103 with 5 speed in 1970 W108 280SE

Hi there Benz guys and girls.

I´ve owned my w108 for a few years and now I+m in the early stages of taking it through a similar heart transplant as I did on my old Camaro a few years back, putting newer drivetrain in it.

I´ve bought a rusty beater 1988 W124 300E with a manual 5 speed, and my plan is to completely overhaul that engine, new bearings rings etc etc including a dbilas performance camshaft swap. and replace/save my old M130 with 4 speed.

The reasons are many, yes I know that the M130 is a great engine etc etc, BUT the 5 speed transmissions that fit the old engine are super expensive, and the M130 does NOT get anything even near good fuel economy..plus all spare parts for it are getting cray expensive now.

So I descied to go with the M103 because I think it will do my W108 good justice, and without cats and with the camshaft from dbilas I think 200+ hp is reasonable for it, and the 5:th gear will make it drivable in the highway as well :-)

So now I am wondering if you know of anybody that has done a similar swap?
What do I need from the donor car? What can I buy, what do I need to manufacture?
Transmission and engine mounts? Wiring, you know, the whole thing

So IF you know anything about putting these somewhat more modern engines in older Benzes, please help me out.
When I did put an LS2 with 6-speed into my older Camaro, every info was easily available on lie, and most custom parts could be bought, but I feel this is gonna be way more complex than that..

Best regards/Robert from Sweden
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post #2 of 4 (permalink) Old 10-02-2015, 05:45 PM
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I did something similar with a M111 / six speed into a W110.

What I had to do:

New motor mounts / trans mount (Trans was very easy)
Had to cut the tunnel to clear the larger trans
Used megasquirt to control the motor. Threw away the factory ECU. (It was dead anyway.)

I was able to use all the factory sensors, and the engine cleared everything, except the emergency brake. I had to go to a tunnel mounted ebrake.

That is a start.

Good luck, and I want to follow this. I love the straight sixes.

-- brett
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post #3 of 4 (permalink) Old 10-02-2015, 07:31 PM
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Quote:
Originally Posted by bfrymire View Post
I did something similar with a M111 / six speed into a W110.
...

I love the straight sixes.

M111 is a 4-cylinder. Correct?
Might it have been a m110 in a w111?

.

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post #4 of 4 (permalink) Old 10-02-2015, 10:14 PM
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Quote:
Originally Posted by Fonzi View Post
M111 is a 4-cylinder. Correct?
Might it have been a m110 in a w111?
Correct, it's the C230 engine, a 4 cylinder. And into a W110. If I had the W111, I would have gone with the later six cylinder engine, the M104.

-- brett
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