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View Full Version : V12 question (just curious)


crashnburn80
03-09-2005, 12:06 AM
Is the 5.4L of say a 96 850i block swapable with the 5.0L v12 head of say a 91 850i? Is the larger block designed different so that the acessories would not be compatible between the 5L block and the 5.4L block.

Theres no 8 series forum to ask, but I figured the 7s are the next closest thing.
shogun
03-09-2005, 12:20 AM
There are some 8 series boards on the net:
http://bimmer.roadfly.org/bmw/forums/e31/
http://www.bimmerboard.com/forums/e31/
http://www.clube31.com/index.php?sid=d12655e12c55d12a05139ad9ff81624e
http://forums.bimmerforums.com/forum/forumdisplay.php?f=55


I have the 5.0 M70 engine, but I am not sure if this is identical to the 5.4 Liter engine of the E32. Actually I belive it is a 5.6 Liter engine and called S70 engine. Probably the Motronic's are different. Sizewise should be no problem.
General Info are also here
http://www.unixnerd.demon.co.uk/bmw.html
http://members.aol.com/macarena5/index.html
crashnburn80
03-09-2005, 12:55 AM
[QUOTE=I have the 5.0 M70 engine, but I am not sure if this is identical to the 5.4 Liter engine of the E32. Actually I belive it is a 5.6 Liter engine and called S70 engine. Probably the Motronic's are different. Sizewise should be no problem.
[/QUOTE]

The 5.6L S70 engine is esentially the M8 engine, it bears the M logo and puts out substantially more power (about 370 something hp). The real M 48 valve V12 never saw production. They made a 5.4L v12 right after they ceased production of the 5.6L 850csi that had 322hp. The 5.4L is substantially less expensive.

I've seen the other boards, but I didn't want to go create a membership, and I was just wondering if anyone here knew.
shogun
03-09-2005, 01:04 AM
Hi, my friend,
look on the German E31 info, it's also available in Englsih, all engines in detail are shown here
http://www.e31.net/navtechnik_e.html
crashnburn80
03-09-2005, 02:23 AM
Hi, my friend,
look on the German E31 info, it's also available in Englsih, all engines in detail are shown here
http://www.e31.net/navtechnik_e.html

Good site, thanks. Looks like knock sensor may be an issue since the 5.4L is running 10 to 1 compression and the 5L runs 8.8 to 1.