M5 in e9 car

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jkyle69

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I am thinking about dropping in an M5 V8 engine in to a project car I have, I also have a dog leg Getrag 265 gearbox; I was thinking about trying to mate the 2 items together - can anyone see any problems with this (would like to retain the mechanical speedo drive so I can install a fibreglass motorsport replica dash.
 
Aside from having to make a custom bellhousing/adapter plate, you'll have to shoehorn a S62 in there and all of the M5 braking systems too, at the very least. The S62 will hit where the brake booster is now.

From a fabrication standpoint, it would be much easier to simply use the M5 trans and have a mechanical speedo drive elsewhere along the drivetrain, or have a converter made by a speedo shop. Havig a custom converter seems to be a cheaper option, as I have been quoted around 300$ for that kind of job.

As always, there is the worry about chassis twist with that much torque. The first time you floor it, you could rip the car in twain, unless you reinforce it.
 
Thought they had cars between 600-800bhp in the 1970s, those engines would have been producing more torque than an M5 engine. What mods would they have done to the chassis?
 
I suggest putting in at least an eight point cage..........

-shanon
 
Thought they had cars between 600-800bhp in the 1970s, those engines would have been producing more torque than an M5 engine. What mods would they have done to the chassis?
Click to expand...

Oh, they did, but not on a stock chassis. Given how whippy the car is, many board members have suggested that the unaided frame limit is in the realm of 300hp/ft-lbs. Once you reinforce the frame, using structural welds, additional members, and a heavy duty roll cage, the sky is the limit.
The old BMW racers apparently had completely different subframe designs and a full cage, based on the pictures of the groupe 2 and 5 cars I have seen floating around.
 
Was conversing with another list member regarding roll cages and posted some pix of the front part of the cage residing in TBL. When she raced in IMSA, the engine was a 3.X liter turbo and while I don't have the HP/torque figures one of the drivers who drove the car in the 24 Hours of Daytona in '79 said that on the banking the car kept up with the 935s so I'm guessing there were a couple a ponies under the hood. Anyway, to keep the chassis from flexing, and of course for safety, a most elaborate cage system was installed. The links below will give you some idea.

http://www.filelodge.com/files/room24/633849/cage w-dash-s.JPG

http://www.filelodge.com/files/room24/633849/cage no dash-s.JPG

http://www.filelodge.com/files/room24/633849/driver side front-s.JPG

http://www.filelodge.com/files/room24/633849/driver side mount to front frame rails-s.JPG

http://www.filelodge.com/files/room24/633849/cage front upper-s.JPG

http://www.filelodge.com/files/room24/633849/forward support 1-s.JPG

http://www.filelodge.com/files/room24/633849/forward support 2-s.JPG
 
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