Author Topic: W111 engine/drivetrain swap  (Read 1854 times)

Rahul

  • Full Member
  • Senior
  • ***
  • Bermuda, Devonshire, Paget
  • Posts: 205
  • 1971 280SL automatic #571, parchment
W111 engine/drivetrain swap
« on: January 08, 2023, 14:37:38 »
Curious to know if anyone in these forums has successfully put a modern drivetrain into a W111 chassis?

Obviously aware of the Mechatronik M-Coupe (at eyewatering expense!), and I have seen Matt Kwiek in Michigan has done this for a customer.

Interested in any user-experiences. Similar to the W113, it appeals to me if you can find the right donor car(s) for the job and not sacrifice a well-running/original car in the process.

Rahul
1971 280SL auto #571 over parchment

cfm65@me.com

  • Associate Member
  • Gold
  • *****
  • Mossel Bay, South Africa
  • Posts: 702
Re: W111 engine/drivetrain swap
« Reply #1 on: January 08, 2023, 17:31:43 »
Hi Rahul,
The 111 also came out with a 350 V8, so there should be lots of space for what ever you would like to put in the front. If they could put a V8 in a Pagoda, there should be no problem.
Regards
Chris
28 Ford Model A Pickup
29 Chevy Phaeton
67 E Type FHC
67 250SL 5 speed
83 911SC
2015 VW T5 California Pop Top

Jack the Knife

  • Full Member
  • Senior
  • ***
  • USA, FL, Vero Beach
  • Posts: 236
Re: W111 engine/drivetrain swap
« Reply #2 on: January 08, 2023, 18:50:58 »
Curious to know if anyone in these forums has successfully put a modern drivetrain into a W111 chassis?

Obviously aware of the Mechatronik M-Coupe (at eyewatering expense!), and I have seen Matt Kwiek in Michigan has done this for a customer.

Interested in any user-experiences. Similar to the W113, it appeals to me if you can find the right donor car(s) for the job and not sacrifice a well-running/original car in the process.

Rahul

A true gearhead on this forum named GGR I believe put a M117 into his W111 coupe. My understanding is that it is incredibly fast. He also did the same in his 280SL. He is very happy to talk about his projects and is very talented -- send him a message.
1964 230SL
2015 G550 """Professional"""

ja17

  • Full Member
  • Platinum
  • ******
  • USA, OH, Blacklick
  • Posts: 7312
Re: W111 engine/drivetrain swap
« Reply #3 on: January 08, 2023, 21:19:47 »
John Olson, founder of SL Market Newsletter, put a 350HP V6 engine from a SLK32 AMG in his W111 220SE coupe.
Joe Alexander
Blacklick, Ohio
1969 Dark Olive 280SL
2002 ML55 AMG (tow vehicle)
2002 SLK32 AMG (350 hp)
1982 300TD Wagon turbo 4spd.
1963 404 Mercedes Unimog (Swedish Army)
1989 flu419 Mercedes Unimog (US Army)
1998 E430
1974 450SLC Rally
1965 220SE Finback

Rahul

  • Full Member
  • Senior
  • ***
  • Bermuda, Devonshire, Paget
  • Posts: 205
  • 1971 280SL automatic #571, parchment
Re: W111 engine/drivetrain swap
« Reply #4 on: January 08, 2023, 22:31:03 »
Great, thank you! Lots for me to investigate!
1971 280SL auto #571 over parchment

lpeterssen

  • Vendor
  • Gold
  • *****
  • USA, FL, Miami
  • Posts: 599
Re: W111 engine/drivetrain swap
« Reply #5 on: February 09, 2023, 17:44:47 »
Dear friends

I am just working on a project like these for a customer who owns a w113-230SL which received and engine and transmission transplant from a 560SL-88’

I am working on the engine control and communications with the original body harness.

While this is an interesting work which now is demanding lot of neurons and specialized man hours to solve a job that was not very well plan ahead.

These are my advises based on this actual experience

1. Take in mind the limitations of signal availability/translation on your classic car.  This means the following.

On a modern drivetrain the speedometer is electronic and forms integral part of the drivetrain to inform different components of actual speed and adjustments that therefore will be made to the combustion control, the automatic transmission, etc.

A W111 or w113 lack of an electronic speedometer capable of converting the VR signal coming from transmisión into the appropriate square wave signal needed by those ECU’s that control engine and transmission

2. Tachometer. You should source one later w111 or w113 electric signal tacho that can use signal from coil negative terminal to display engine speed

3. Temperature gauge.  You will have to built and hybrid unit to replace original w111 gas driven temp gauge

4. Oil pressure gauge. You will need to make a conversion to your gauge or find a good sampling point on the new engine to install a capilar tube to bring oil pressure to instrument cluster.

5. Full harness modification. The original w111 harness should be modified to increase the load that can pass through it. 

6. Interconnection ports.  The w111 harness should be heavily modified to provide new circuits needed to power the new engine / drivetrain.  Apart from that, in order to be able to use original engine / transmission management harnesses the original harness from w111 has to be modified in such a way that provides necessary inter communication ports bringing all the signals needed from legacy systems.


Keeping all that in mind my advise is try to go for and engine swap that uses only these engine control technology:

Bosch k-jetronic.  Any engine with these engine management technology is relatively easy to implement. KE-jetronic is a step up, and require more work.

Look for engines that have an hidraulic controlled transmission, and avoid ones that require an electrical speed signal, unless you plan to spend big bucks.

Best regards
L.peterssen