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Carter,
Is this part number correct (11 22 170 903 2)? It comes up as a flywheel for an automatic from an E36. I can’t imagine that there are people using an automatic to race with.
Also I am wondering why you guys added this.
:cheer:
Thanks,
Daniel
Now I remember…kind of…
Mike Mills mentioned that the original M42 engine stock flywheel is very expensive, thus our allowing that flywheel that will work…I think.
Again, I’ll do some more research but I think that’s correct. It’s a cost issue to help the drivers’ wallets.
Carter
I have a question about this flywheel, too. The diagrams and pictures I have seen of this flywheel shows it having three very large holes right where it seems the clutch disc would contact the flywheel. Are there other parts that are needed to make this work? Also, was this rule to allow for a cheaper replacement or to help even out the performance differences between the 4 and 6 cylinder cars? It appears that this one is much lighter than the stock dual mass piece. We just changed the clutch a couple of months ago, so I don’t want to open it all up again unless it’s necessary.
Any more word on this?
Here is what the twin-mass flywheel looks like.
Here is that part number that you gave us.
Rob,
since you’re building a 318iS, do you have any insight re this alternative flywheel allowed in the rules?
thanks,
bruce
I asked a certified BMW tech and she said that there is no way to correctly use an automatic flywheel with a manual transmission.
If you meant for use to be able to use a the single mass flywheel (part #: 11 22 173 931 5), it is not available in the US as far as I know.
interesting, looking up the 11221739315 number from Daniel at http://www.bmwmobiletradition-online.com/bmw/showparts.do?model=AF93&mospid=47305&btnr=11_1151&hg=11&fg=20&hl=1
shows that it was the e30 318iS flywheel prior to Mar 90 and there is a dramatic difference in the price!
01 FLYWHEEL 1 03/1990 11221739315 $274.55
01 TWIN MASS FLYWHEEL 1 21211223550 $831.30
However, I would also comment, if that is the part that is supposed to be referenced in the rules, that it doesn’t need to be specifically mentioned, because it was a stock part on the e30 318iS at some point in it’s life and hence is legal without special mention.
cheers,
bruce
I asked the parts dealer you listed up top there. They said they do not carry that part and it will take roughly 2-3 weeks to get it in from Germany, if the part is still carried.
Ok, I’ll bite and divulge another speed secret to my 318’s massive speed. :laugh:
I have the single mass flywheel in my car… It is five pounds in total lighter than the dual mass unit. I can provide exact numbers on this unit for those who might machine some mass off it for a advantage. It’s a rather bizzarre looking and heavy peice. The flywheel itself is only about 4 pounds lighter than the twin mass. The clutch makes up the remainder.
It is listed as a valid US part number in the ETK but only for cars produced before 3/90. I could not find a 3/90 engine, obviously that would be difficult at this point. So I bought a late 87 car and I’m calling my car a 3/90 production car. For those who might scoff at this, I stripped the car to a bare tub and swapped everything over from my original 318is including the wiring harness, which had some nice weight savings in itself. This is now a real pre 3/90 production US 318is. The only difference I can find in the driveline in my ETK checking is the clutch/flywheel. I never saw any different gear ratios or diffs available on US 318is cars.
Some have told me these never came on US cars however, replacement clutches are available from several US warehouse distributors. This leads me to beleive they are here in the US allready. I bought my flywheel from BMW-NA and it took 10 days from Germany to get it. They didn’t have a ton of them, but no more than you’d expect for a car out of production for 16 years. I got the clutch right off the shelf from one of our OE suppliers.
Here are the needed parts to make this swap work.
11 22 1 739 315 flywheel
21 21 1 223 570 clutch(I’m pretty sure this is the number used in my records, i’d have to double check)
11 22 1 717 841 x8 shorter bolts
I could get this stuff for anybody planning to build a 318is.
21 21 1 223 570 (clutch set)
AND
21 21 1 223 571 (clutch set)
According to my tech friend at BMW they are the same thing. She suggested that if you buy a single mass flywheel that you buy an aftermarket clutch with a sprung hub.
They have totally different clutches. The OE disc for the single mass is sprung hub. This keeps it from rattling. You could probably run the unsprung US disc if the compressed thickness is similar and save some weight there. I choose to run the sprung hub to keep the mod a bit more stealth. I figured if I ran the unsprung disc somebody would protest my ‘lightweight’ flywheel and I’d have to tear the gearbox off for no reason.
BMW said they are the same clutch set, though I would believe you since you already purchased one.
I would think that your "lightweight" mod would be legal since that flywheel is listed as a valid flywheel for our car, yes I have one I am prepping. Also it helps that it cost $600 less then the dual mass. And it’s not a huge weight savings, 5-6 pounds.