Bmw E34 M70 Swap
By the Editorial Staff
March 24, 2026
Bimmerforums is the preferred online BMW Forum and community for BMW owners. At Bimmerforums, you will find technical how. Since some of you where interessted in the V12 swap i'm doing here some informations and updates: -M70B50 from an 1989 e32 750iL -ZF GS6-53DZ from an 530d e60 -PMC Adapter Kit for the transmission -dbilas dynamic 45mm ITBs -Supersprint stainless steel exhaust system -complete newly powdercoated subframes from e34 540i -2.93 210 lsd from e34 540i (rebuild).
What happens when an enthusiast shoehorns an M70 V12 engine into a BMW E34 5 Series? Well, you get an incredibly unique performance vehicle. Just like the M70 powerplant had to be shoehorned into the tight E34 engine bay, so had the Supersprint large diameter exhaust been squeezed underneath the chassis. Fast forward to 2019, Supersprint still offers this very same, stainless exhaust system for all of the E34 enthusiasts, who are doing the same type of engine conversion on their E34.
The placement of accessories and welded brackets and all that othe stuff is different and would make the swap extremely complex requiring fabrication. Dont even get started on the M70. Its as easy to put an E34 shell and interior on an E32 as it is to put the M70 into an E34.
Fix the M50 as it's the best Motor BMW has made in a long time. This 1993 BMW E34 M5 from Europe is currently for sale out of Rochester, New York with an asking price of $16,500. The original engine has been replaced by a 5.5 L S70B56 V12 from a BMW 850CSi.
The rest of the powertrain consists of a Getrag 560G six. BMW V12 M70 (number of products: 8) Quick order View Adapter Kit BMW M70 - manual 6-speed BMW M57n GS6-53DZ HGD JGA - 240mm / 9.45". Here it is again! Engine freshly rebuilt.
As an example, the BMW M70 V12 has a displacement of 304 c.i. while the M5 S62 V8 has a displacement of 302 c.i. Essentially the same displacement.
Factors such as camshaft design, rotating assembly design, displacement, compression ratio, intake design, fuel delivery, exhaust design etc all affect the power output more than the number of.