W108 engine upgrade - Mercedes-Benz Forum

 
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post #1 of 10 (permalink) Old 03-23-2013, 02:33 AM Thread Starter
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W108 engine upgrade

Hi , new to the forum and finding it very useful.

I own a 1971 w108 280 se with a blown head gasket, still drives. (m130.980)

I have acquired a running m116 3.8 v8 and trans from 1985 car.

I realise technology changes, so can anyone comment or give an opinion; fix the head gasket or put the v8 and trans in it's place.

If it's a swap what should I look out for? I can see the V8 has far more sensors etc than the simpler old straight 6.


Many thanks Jason
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post #2 of 10 (permalink) Old 03-23-2013, 08:07 AM
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I would keep it orignal and put in a new gaskit set with a valve job and head refacing.

116 is a lovely V8 with its own set of parts problems .I am starting to rebuild one now,and have to source out rare injection air flow rubber pipes for the engine .
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post #3 of 10 (permalink) Old 03-24-2013, 12:38 PM
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I would have to think putting in a head gasket an playing with the valves would be a lot less effort than swapping in another engine. Not because I'm a purist, just lazy and prefer driving to wrenching.
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post #4 of 10 (permalink) Old 03-24-2013, 03:39 PM
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There are various threads on here about putting V8's into finnies and W108's. Some things you need to consider:
- diff ratio - you will want a diff fr oma 3.5 or 4.5 V8 W108 or else it will rev a lot on the highway
- you will also want the engine mount arms from a 3.5
- some wiring to do - I think '85 is series 1, so not too bad
- prop shaft will need modifying
- as your car is a '71, it should have the larger transmission tunnel already, so that should be ok
- swap fuel pump/accumulator/filter over
- custom exhaust (don't think the standard manifolds will fit). Depending on how good this is, you may need the power steering box from a 3.5 also.
- handbrake system may need to be modified - probably just keeping the cable over to the chassis rail so it does not foul the motor
- modify the throttle linkage
So it is not something you can do in a weekend.
Cheers,
Drew
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post #5 of 10 (permalink) Old 03-26-2013, 06:31 PM Thread Starter
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Thanks for the replies. I'm going to stick with head gasket on the original engine I think, engine swap sounds easy in theory, but when you break it down like that....
Cheers
Jason
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post #6 of 10 (permalink) Old 03-28-2013, 02:42 PM
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Not so fast Jason! yes, fixing the L6 is the cheaper and easier alternative, but how did you feel driving the L6? I have a 1967 230S with a 4 speed manual, but the car is really sluggish, and the engine is noisy and unrefined. I am looking for a good reason to upgrade to a more modern L6 or a V8.

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post #7 of 10 (permalink) Old 03-28-2013, 04:01 PM
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Repairing the six is probably a small to medium project. A V8 engine swap is a huge project. Depends what you want and what time you are willing/able to put in.
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post #8 of 10 (permalink) Old 03-28-2013, 04:02 PM
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You don't need a better reason coolvibes other than really really wanting to do it! What you do need is time, a bit of money and determination to keep going once the honeymoon period of puling things off the car is over! On my car, I did most of the transplant in about a year, but then I got bogged down in body work and lost momentum. Got distracted by other projects, work and family got busy, and so it took 6 years to get it back on the road - so persistence and discipline in getting in the shed when you don't feel like it is required.

Are you sure something is not wrong with the 230? I had a 220S and ended up with a 280S motor in it with an auto and it went quite well. I even towed a car and trailer home with it through a mountain range once (not fast though!). As long as you keep the revs up, I thought they went quite well. The V8 was more for the sound for me.

An M110 6 goes in pretty easily, and I have had people suggest to me an M103 as well, but I have never measured them up at all.

Good luck,
Drew
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post #9 of 10 (permalink) Old 03-28-2013, 08:52 PM
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Quote:
Originally Posted by Coolvibes View Post
I have a 1967 230S with a 4 speed manual, but the car is really sluggish, and the engine is noisy and unrefined. I am looking for a good reason to upgrade to a more modern L6 or a V8.
But you are comparing (I think) 120 HP in the 230 S vs. 160 HP in the 280 SE which is a noticeable difference. I have a M130 engine (out of a 1968 280 S W108) with webers in my 250 S (W108) and I find it to be fairly quick, and I would think one with good fuel injection would be a little faster still. I would replace the head gasket...

Currently: 1967 250 SL, 1963 220Sb, 1965 300SE Lang, 1971 280SE parts car, 1972 Alfa GTV, 1965 Alfa Duetto, 1993 BMW R100R
Past: 1971 250 C, 1985 300 TD, 1967 250 S, 1968 280 S,1981 300 D, 1982 280CE, 3 Facel Vegas, Borgward Isabella Coupe, Alfa 2600 Sprint, Volvo P1900 (yes), numerous less interesting Volvos, ...
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post #10 of 10 (permalink) Old 03-28-2013, 09:03 PM
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@adler, I have a dead 117 and 116 engine. If you are looking for some of that stuff private message me
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