Single Mass Flywheel--

[bmwmech1]

The solution I've decided on does include an e39 540i flywheel - I'm using the JB Racing unit. I do have everything bolted up and in the car, but until I can run it, I can't confirm that the combination of parts will work. I've done my homework, but in the end, we need to see it work. The remainder of the parts are standard for another BMW model, so if it works, you can just simply order a clutch kit for the application, which is very common.

I'm trying to make a race on 5/20 (we'll see), so I better have an answer soon!

-Bruce

Well, I hope you make the deadline... Anxious to hear the good news that you got everything done and were able to make the race! Thanks for all the pioneering you're doing... you're forging a path for all of us to follow...

Garey

[BruceBe]

alright well keep us updated Bruce, I just want to put the clutch and all on the motor while its out of the car so I dont have to do it on the floor.

The solution I've decided on does include an e39 540i flywheel - I'm using the JB Racing unit. I do have everything bolted up and in the car, but until I can run it, I can't confirm that the combination of parts will work. I've done my homework, but in the end, we need to see it work. The remainder of the parts are standard for another BMW model, so if it works, you can just simply order a clutch kit for the application, which is very common.

I'm trying to make a race on 5/20 (we'll see), so I better have an answer soon!

-Bruce

[BimmerScreamer]

alright well keep us updated Bruce, I just want to put the clutch and all on the motor while its out of the car so I dont have to do it on the floor.

[bmwmech1]

any updates on this thread, I will probably be running a e39 aluminum flywheel and need to know my options for a clutch

I like this idea,

Bruce is keeping this under wraps until he has final testing done. He told me he has a solution with readily available parts, but has not come out with the exact pieces yet. He'll let us know when he's confident it is the proper solution... IIRC, he said the E39 flywheel was part of the solution, though.

Garey

[BimmerScreamer]

any updates on this thread, I will probably be running a e39 aluminum flywheel and need to know my options for a clutch

I like this idea,

So a E39 aluminum flywheel and E39 pressure plate+E36 M3 disc hybrid setup should be the ticket, then?

Garey

[Jean]

Thanks Bruce!

[BruceBe]

The Plot Thickens

The M60B30 pressure plate will *not* bolt up to the e39 JBR flywheel. Once again, the locating dowels are spaced too far apart. I don't have an e36m3 flywheel, but I would bet that the M60B30 pressure plate would bolt right up to it. For those interested in the actual numbers, the M60B30 dowel holes are on a ~276mm BCD, while the e39 has dowel holes on a ~262mm BCD. Both e39 and e34 dowels seem to be nominally 10mm in diameter.

I will now get an e39 clutch kit, and measure all of the critical dimensions for putting an entire e39 clutch setup in the 5-speed trans (overall height, TOB height). I'll compare clutch discs, to see if one can at least interchange the clutch discs, since the 5-speed needs a 29mm diameter hub.

-Bruce

[BruceBe]

I've purchased a stock Sachs PP/clutch for an M60B30, and will compare the critical clutch disc dimensions to those of the e36M3. If the e36M3 disc works, at least we have some choice in friction material/type for this application. I have yet to find a source for an upgraded clutch kit for an M60B30.

My research has shown that the correct flywheel is the 240mm e39 flywheel. JB Racing part # 520-150-240. I have this in-hand now as well.

-Bruce

[bmwmech1]

Actually, only the M60B40 had 265mm clutch disc. All M62 and S62 engines have 240mm disc.


And yes, the 5-speeder is the same ZF S5D 320Z unit as in E36 M3.

I know, I edited the post to say the E34 6 speeds, but it didn't post my edit So a E39 aluminum flywheel and E39 pressure plate+E36 M3 disc hybrid setup should be the ticket, then?

Garey

[Jonsku]

6 speed disc diameter is 265mm, 5 speed is 240mm. Splines are different also. From what I was told, the 5 speed trans is the same as the E36 M3, just a different bellhousing to mate with the V8. Bruce has gotten some more definitive info and I would trust his findings over what I've been told...

Garey

Actually, only the M60B40 had 265mm clutch disc. All M62 and S62 engines have 240mm disc.


And yes, the 5-speeder is the same ZF S5D 320Z unit as in E36 M3.

[bmwmech1]

E34 V8 6 speed disc diameter is 265mm, E39 V8 6 speed is 240mm, same as E34 V8 5 speeds, but a completely different design. Splines are different also. From what I was told, the 5 speed trans is the same as the E36 M3, just a different bellhousing to mate with the V8. Bruce has gotten some more definitive info and I would trust his findings over what I've been told...

Garey

[OrganicMechanic]

what is the diameter difference between the 2 disks?

[bmwmech1]

This combination will not work. The locating dowels for the PP are closer to the centerline of the flywheel on the M60 than on the e36 S52US. I verified this with both units on a bench, after being told of the incompatibility by the nice folks at JB Racing.

I am in the middle of a swap right now on a dedicated track car, so I will update the group when a solution is identified.

-Bruce

Hey Bruce, so in theory the clutchnet E39M5 flywheel and PP could be used along with a disc compatible with the V8 5 speed, correct? I wonder if the E36M3 disc could be used. The info I was given was obviously incorrect concerning the compatibility of the E36/E34 5 speed stuff. Hopefully your search is yielding better info than mine...

Garey

[OrganicMechanic]

if you have the crank balanced with the clutch and PP mounted to the adapted flywheel, you would be fine--Any performance machine shop should be able to handle it--

[BruceBe]

Maybe - re-centering for new dowels and maintaining zero balance isn't a no-brainer. JB Racing also indicated that the step-depth is different between the two setups (e39 vs. e36-m3). I did not measure for that, however.

-Bruce