Author Topic: M42 Lightened Flighwheel? (Read 13534 times)

M42boy · « **Reply #15 on:** April 05, 2006, 12:51:04 AM »

Quote from: bmwman91

The flywheel you want is from 1989+ M20's, the SINGLE MASS one. If it is huge & has 2 halves, it's not what you want. You cannot pick the wrong one, unless you are braindead or something. I ordered the bolts from Pelican Parts...they were just listed in the parts catalog there.

Okay thanks... Yeah, I'm not as concerned about the flywheel part, as the starter and other stuff. If the rednecks at the yard give me the wrong part and I have issues once installed, then I'm in a real prediciment.

What's the saying... "Measure twice. Cut once."

asubimmer · « **Reply #16 on:** April 05, 2006, 01:13:52 AM »

Quote from: 2002maniac

did you get your setup from bret?

nahh, I was going to but I got one from a friend that went to a alum flywheel and gave me a great deal

318isle · « **Reply #17 on:** April 05, 2006, 02:10:34 AM »

I got the $400 9 lb. flywheel from BMP and a stock clutch, PP, TOB. I am totally satisfied with it. I participated in a Track Day event and autox this past weekend (the last, our track is closing

) and I had better times then some M3s and Mini Coopers during Track Day, and won my class in autox.
I realize for some $400 may be a lot for a flywheel that will give you instant performance, but my thought is, a new set of wheels will cost 4x that much and all you get is.....eh a nice wheel!
IMO....the $400 is well worth it, but if you can put together the M20 menu and get all the parts for less, more power to you. Either way, a lightened flywheel is definitely worth the Money and/or Trouble.
As for idling....no problem, chatter too minimal to be bothered, my wipers make more nose.

Do it and be happy.

Froos · « **Reply #18 on:** April 05, 2006, 06:11:16 AM »

Quote

The M40 flywheel swap is much simpler than the M20. All you require is an M40 flywheel, shorter M40 flywheel bolts and an M40 clutch kit. I realise you didn't get the M40 engine in the USA but you could probably import the parts from Australia or Europe very cheaply.

Im have a m40 engine in the garage, is that single or dual mass?

shellback · « **Reply #19 on:** April 05, 2006, 06:55:13 AM »

Quote from: 318isle

I got the $400 9 lb. flywheel from BMP and a stock clutch, PP, TOB. I am totally satisfied with it. I participated in a Track Day event and autox this past weekend (the last, our track is closing ) and I had better times then some M3s and Mini Coopers during Track Day, and won my class in autox.
I realize for some $400 may be a lot for a flywheel that will give you instant performance, but my thought is, a new set of wheels will cost 4x that much and all you get is.....eh a nice wheel!
IMO....the $400 is well worth it, but if you can put together the M20 menu and get all the parts for less, more power to you. Either way, a lightened flywheel is definitely worth the Money and/or Trouble.
As for idling....no problem, chatter too minimal to be bothered, my wipers make more nose.
Do it and be happy.

Aloha Isle,
I wish I could be present to witness the chatter part. I know a lot of folks complain about the chatter. Exactly what is the chatter all about and when do you hear it the most? Sorry for the rookie chatter

Thanks,
Chris

kowalski · « **Reply #20 on:** April 05, 2006, 11:06:18 AM »

audio clip?

GrippyDrifty · « **Reply #21 on:** April 05, 2006, 11:07:04 AM »

318isle--I'm pretty sure I'm gonna go aluminum for my flywheel. I don't want to source out all the parts for the m20.And then there's the stupid TOB. I've been looking at the BMP one, but you said you purchased yours for $400? It is listed at $499 on there site. Did you purchase it a while back or something? Just wondering. Now that I've looked into it, the m20 swap doesn't sound drastically cheaper than the aluminum flywheel. I'm guessing that when it's all said and done, the m20 swap (still referring to the FW setup) will cost around $300ish. Hardly that big of a difference. Needless to say, there also seems to be a huge difference in labor involved. I vote aluminum m42 all the way. Unless I get an m20 set up for free!!!;)

kowalski · « **Reply #22 on:** April 05, 2006, 11:10:32 AM »

well you'll still have to buy a clutch.. so the m20 settup would be quite a bit cheaper. a flywheel is like 50$, and a starter is probably the same (used parts of course) the only issue is the TOB... so your still saving 300-400$ or so. plus there is more clutch options for the m20.

GrippyDrifty · « **Reply #23 on:** April 05, 2006, 12:20:29 PM »

Well, you don't HAVE to get a new clutch. You left out the pressure plate for the m20. From bmwman's post:

M20 flywheel
M20 clutch disc & PP
E21 323i TOB
M20 flywheel bolts
M20 starter pinion gear

And if you don't mind me quoting you bmwman91, you were selling your set up a while back for $300 right? I'm assuming that's how much you ended up spending?

$300 vs $400-500

As I mentioned before, the difference in labor alone is enough of an incentive for me though. As far as options go, you are right about m20's having more, but I have seen m42 LW flywheels from 9 to 14lbs. That's enough variety for me. I was actually quite surprised by how functional 318isle made the 9lb FW seem. I might even go that light!

D. Clay · « **Reply #24 on:** April 05, 2006, 12:36:03 PM »

Can the M40 flywheel be lightened and by how much? Does anyone know of a source or cost. I gather you would need the FW, clutch/PP, TOB, and new FW bolts.

kowalski · « **Reply #25 on:** April 05, 2006, 12:36:03 PM »

was that 300$ with or without the clutch? personaly i would advise against reusing the clutch, as its already out, its not terribly expensive and at the higher milage of the car you may as well do it now then take it out in 2 years to do it again.

i didn't mean more variety of flywheels when i was ssaying that, i meant clutch's, there is more aftermarket parts available for m20's then there is m42's.

johna · « **Reply #26 on:** April 05, 2006, 03:51:54 PM »

Quote

Can the M40 flywheel be lightened and by how much? Does anyone know of a source or cost. I gather you would need the FW, clutch/PP, TOB, and new FW bolts.

The M40 flywheel is single mass type so can be lightened. The stock one that I installed was 9.7kg (21.4 lbs) but I know of someone who had theirs lightened to 7.7kg (17 lbs).

They are available second hand here in Australia for around AU$100 - US$73) but shipping to the USA would would be very expensive (about AU$160 - US$116).

I would try BMW parts recyclers in Europe, shipping should be less from there.

You just need the M40 flywheel, M40 shorter bolts, and an M40 clutch kit (clutch disc, pressure plate and throw-out bearing).

318isle · « **Reply #27 on:** April 06, 2006, 02:06:26 AM »

Quote from: GrippyDrifty

318isle--I'm pretty sure I'm gonna go aluminum for my flywheel. I don't want to source out all the parts for the m20.And then there's the stupid TOB. I've been looking at the BMP one, but you said you purchased yours for $400? It is listed at $499 on there site. Did you purchase it a while back or something? Just wondering. Now that I've looked into it, the m20 swap doesn't sound drastically cheaper than the aluminum flywheel. I'm guessing that when it's all said and done, the m20 swap (still referring to the FW setup) will cost around $300ish. Hardly that big of a difference. Needless to say, there also seems to be a huge difference in labor involved. I vote aluminum m42 all the way. Unless I get an m20 set up for free!!!;)

I purchased it during their Holiday sale and they were offering "free shipping" just not to the middle of the Pacific! I worked with a guy named Anthony who was very helpful.
I'm sure the M20 set has it's benefits, but I don't see the need for a higher performing clutch, since the M42 doesn't put down that much HP/Trq.

As for making the Alum. FW functional, there wasn't much to it once it was installed. Instant gratification!

Chatter is very minimal. I had a LTW FW in my 2000 M Coupe, now that was chatter that was not wanted. You would think the clutch was falling apart. That's why I was so hesitant to do it with my 318is, but I thought I'd just give it a shot anyway.....and I'm glad I did.

Now, who knows how to remove the head and do some Port & Polish to this baby? Has anyone done this yet? Is this worth it?

Froos · « **Reply #28 on:** April 06, 2006, 02:54:58 AM »

Code: [Select]

Quote:
Can the M40 flywheel be lightened and by how much? Does anyone know of a source or cost. I gather you would need the FW, clutch/PP, TOB, and new FW bolts.  


The M40 flywheel is single mass type so can be lightened. The stock one that I installed was 9.7kg (21.4 lbs) but I know of someone who had theirs lightened to 7.7kg (17 lbs).

They are available second hand here in Australia for around AU$100 - US$73) but shipping to the USA would would be very expensive (about AU$160 - US$116).

I would try BMW parts recyclers in Europe, shipping should be less from there.

You just need the M40 flywheel, M40 shorter bolts, and an M40 clutch kit (clutch disc, pressure plate and throw-out bearing).

Excellent! that setup is sitting in my garage collecting dust. Ill take some pictures along the way. Is the M40 flywheel capable of using different clutches? O yeah and sorry for all my newbie questions too....

GrippyDrifty · « **Reply #29 on:** April 06, 2006, 12:14:48 PM »

Cool. Thanks for the details 318isle.