!975 W114 280 C Engine Swap/Modernization - Page 3 - Mercedes-Benz Forum

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post #21 of 71 (permalink) Old 06-16-2014, 08:08 AM Thread Starter
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Fonzi, No problem. I did look up the engine and knew it was an M103. I think the engine will fit same as a 104 and it is fuel injected.

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Originally Posted by Fonzi View Post
Thank you. I should have done a google search on the engine number before posting. I remembered reading about m110 and m103 SLs and I wasn't entirely sure the m103 was a big improvement.

Glad to hear it's the m104 you are talking about.

Sorry for any confusion, and thanks for clearing it up so quickly.


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post #22 of 71 (permalink) Old 06-16-2014, 08:48 AM Thread Starter
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Dr.Eurocar, thanks again for your input. Here is the deal that I can get. I just talked to a guy who will sell me his 1973 280 sedan that was running when he drove it into his pasture 10 years ago and his tree-crunched 1986 300 SL at a very reasonable price. In addition, depending on whether or not he can tow my Cherokee with his motorhome, he may be willing to take my cherokee, which I want to sell, as a trade and give me some cash to boot.

Now, I understand that sticking the wrong engine in a car because it is cheap is short-sighted. But, I am not a power freak, and I looked up the fuel efficiency spec on the '86 300 SL here:

Detailed specs review of 1986 Mercedes-Benz 300 SL (model for Europe )

It claims 29 / 23 / 16.2 (21.6) mpg (U.S.); that would be highway/combined/city, which is better than my '87 300E got with the M104 engine.

So, one question is, "I the amount of work to stick the M103 300SL engine in the car about the same as putting the M104 in there?"

These cars are about 300 miles from me, so it is feasible for me to go and get them with a carryall trailer in one day each.

Alternatively, I could bid on a wrecked 90s 300E and hope to get one for a reasonable price. Some are shown here in Atlanta, which is about the same distance as the two cars are located. Bidding closes on some of this within 24 hours, but there are future auctions s well. Generally there is a $250 fee plus a membership fee to bid of about 440 (I think). I would have to go get the car because it is about $1000 plus to ship. They tell you you need to inspect before bidding because nothing they say about the car is guaranteed to be correct (except the pictures really are pictures of the car).

Apparently, I can buy a complete Mercedes 300e that I can drive home for under $ 2000:

https://memphis.craigslist.org/cto/4460667519.html

which I grant is maybe a little silly to then dismantle and put into a 1973 Coupe. On the other hand, I may be able to sell some body parts, I guess. This particular car is about 70 miles from me and can apparently be driven home.

Any suggestions here?


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Originally Posted by DR.EUROCAR View Post
1986-1986 SOHC I6 is a M103
M104 is twin overhead cam engine depending on
I guess the M103 would do but for all the work involved I would be inclined to get the more modern and fuel efficient M104, and Auto is not necessary there are 5 speed manuals available.

I would tend to want the entire running car at my disposal makes things easier and cheaper for any swap.
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post #23 of 71 (permalink) Old 06-16-2014, 09:33 AM Thread Starter
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Dr.Eurocar, I called the owner of the 1989 Mercedes 300E in Memphis with 160 K miles. I can go get the car and drive it home for $1500. Seems like a lot of money, but I wouldn't have any shipping expenses, etc, and registration in MS for a used car is really cheap.

Should I go for a newer model, like a 1993?

Any thoughts? Seems like so many options.

Quote:
Originally Posted by DR.EUROCAR View Post
1986-1986 SOHC I6 is a M103
M104 is twin overhead cam engine depending on
I guess the M103 would do but for all the work involved I would be inclined to get the more modern and fuel efficient M104, and Auto is not necessary there are 5 speed manuals available.

I would tend to want the entire running car at my disposal makes things easier and cheaper for any swap.
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post #24 of 71 (permalink) Old 06-16-2014, 12:11 PM
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!975 W114 280 C Engine Swap/Modernization

I want to see some pics of this 300sl. They are fairly coveted among r107 enthusiasts, the best MPG of all them (I think) when coupled with the 5-speed manual (overdrive I assume) trans.




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post #25 of 71 (permalink) Old 06-16-2014, 12:21 PM Thread Starter
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He is supposed to send me some pictures soon. A tree fell on the top of 300 SL and then he damaged the hood pulling the car out from under the tree.

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I want to see some pics of this 300sl. They are fairly coveted among r107 enthusiasts, the best MPG of all them (I think) when coupled with the 5-speed manual (overdrive I assume) trans.




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Last edited by jndaigle; 06-16-2014 at 01:01 PM. Reason: clarification
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post #26 of 71 (permalink) Old 06-16-2014, 12:28 PM
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I read this morning that the m103 and m104 share the same block. So I guess only the intake and exhaust would be the major differences in the two setups. I would assume the drivetrain connection and mounts would be identical.

You can see I'm doing a lot of assuming.



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post #27 of 71 (permalink) Old 06-16-2014, 07:40 PM Thread Starter
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Fonzi, you wanted to see pictures of the cars we were discussing. Go to eccononno dot smugmug dot com and select New Roads Mercedes gallery. Also I did drive teh car in Memphis this afternoon. It had more wrong than advertised, but I was not surprised because the seller doesn't seem to have a grasp of the condition of cars. For example, a car that has no jack, no spare tire, a dead battery, a broken odometer, and windows that don't go down is not in "excellent condition" so far as I know. On the other hand, the running gear does seem to work.

Quote:
Originally Posted by Fonzi View Post
I read this morning that the m103 and m104 share the same block. So I guess only the intake and exhaust would be the major differences in the two setups. I would assume the drivetrain connection and mounts would be identical.

You can see I'm doing a lot of assuming.



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post #28 of 71 (permalink) Old 06-16-2014, 09:27 PM Thread Starter
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Dr.Eurocar, I would love to do a swap to a 1993 300E engine. I have been searching for a "1993 300E for a thousand" and, so far, no banana. Is finding such a drive-train or car easy to do or does it really require a lot of patience?

So far I have found, for reasonable prices:

(a) a 1989 300E in running condition
(b) very rough 1973 280 and very rough 1986 300 SL. Both appear to have complete drive trains. One has been sitting for a year, the other 10 years.

I have spend quite a lot of time on this search and am willing to spend quite a lot more if that's what it takes.

Quote:
Originally Posted by DR.EUROCAR View Post
You can pick up an M104 engine car with a 4 speed auto like a 1993 300E for a thousand and swap that in.

I can write you out a step by step with all needed parts. swap is not that difficult if you have some basic mechanical skills and can use a Digital Volt Ohm meter.
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post #29 of 71 (permalink) Old 06-16-2014, 10:25 PM
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There is a guy a little north of me that gets and sells 300E motors on a regular basis..

And I think the last one he had, he was asking around $600-700 for it.

Just did a search and didn't see him on craigslist.

So, just be a little patient. It took me a while to find my engine. Hum. I could ask the guy I bought mine from if he has a line on one...

-- brett
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post #30 of 71 (permalink) Old 06-17-2014, 11:09 AM Thread Starter
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Brett,

Thanks much for your suggestions.

The reality is that it is not really that hard to find a 300E Engine. The problem is that the conversion requires at least the entire drive train and probably some other related parts to complete the fuel system, etc.

To complicate matters, even with a 1993 300E there are multiple choices for engines, and neither is 3.0; the choices are 2.8 and 3.2, assuming AWD is not wanted. I do admit that an AWD would be a hoot, but I don't know if I would be up for that kind of conversion even assuming I could find a reasonable donor car.

Any thoughts on this?


Quote:
Originally Posted by bfrymire View Post
There is a guy a little north of me that gets and sells 300E motors on a regular basis..

And I think the last one he had, he was asking around $600-700 for it.

Just did a search and didn't see him on craigslist.

So, just be a little patient. It took me a while to find my engine. Hum. I could ask the guy I bought mine from if he has a line on one...

-- brett
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