M42club.com - Home of the BMW E30/E36 318i/iS
DISCUSSION => Engine + Driveline => Topic started by: Flatsix on May 21, 2007, 06:58:57 PM
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Folks,
I am looking to replace my hideously heavy dual mass flywheel. After some research there appears to be two options. One is the JB lightweight, an aluminum option which weighs approx 8lbs but is has a very complicated design (multi-piece) plus lots of screws/bolts. The other is the Metric Mechanic flywheel from a 325 6 cylinder which has been machined down to approximately 10lbs and which uses the m42 ring gear. Any thought on either? Personally I favor a solid mass steel wheel over a multi-piece aluminum wheel as it is a simpler unit, has less “moving” parts and less likely to warp.... but then there is the ~2lb weight penalty. Other experiences, thoughts or input. I am basically building a mild street racer with possible occasional use on the track.
1991 318is (under construction)
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Do a search there are plenty of threads about this.
I'd recommend the 325 one because it has a sprung clutch disc so it wont have the rattles like mine does.
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There is a third option - use the one piece flywheel from a Euro 316i/318i with the orginal clutch. Not as light as the M20 flywheel, but a simple swap though.
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There is a third option - use the one piece flywheel from a Euro 316i/318i with the orginal clutch. Not as light as the M20 flywheel, but a simple swap though.
this is what im running (flywheel that is, the rest is custom) just need to change the starter ring that is on the flywheel. i.e take the ring off the old duel mass flywheel and put it on the new 318i single mass flywheel. very easy to do, with a little heat
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The M40 (Euro 316i/318i) flywheel weighs around 9.7 kg (21.4 lbs) but can be machined down to 7.7 kg (17 lbs), possibly more.
this is what im running (flywheel that is, the rest is custom) just need to change the starter ring that is on the flywheel. i.e take the ring off the old duel mass flywheel and put it on the new 318i single mass flywheel. very easy to do, with a little heat
I don't understand... My M40 flywheel fitted without any modification.
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Someone here (http://m42club.com/forums/showthread.php?t=2835) is attempting to put an E30 M3 flywheel on his car. If this works, it may be a bit more economical.
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I don't understand... My M40 flywheel fitted without any modification.
I had a shop do mine and they said they changed them over (starter ring on the flywheel), it is quite possible that isn't necessary.
the pressure plate and clutch plate were custom made to cope with the power
my car puts out..
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Ok, I used a standard LuK M40 clutch and pressure plate kit.
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I've never heard good things about going with aluminum flywheels, at least for a street car. I think they are too light for daily driving and are not very durable (flywheels do crack, had it happen to me with another vehicle). So I would either go with the metric mechanics kit or an m20, etc conversion.
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The M40 (Euro 316i/318i) flywheel weighs around 9.7 kg (21.4 lbs) but can be machined down to 7.7 kg (17 lbs), possibly more.
I don't understand... My M40 flywheel fitted without any modification.
I am using the M40 single mass flywheel machined down to 7.6kg... been using it for 3 years aledi. No problems watsoever..
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What US available clutch can be used with the M40 single mass flywheel?
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I have standard M40 flywheel waiting for lightening and installation and my understanding is that it will fit straight away to M42.
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Those of you who have the M40 piece, what clutches are you using? Looking to do an LTW flywheel swap, but M40 parts are difficult to come by in the US :(
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I have the M40 flywheel also. Machined to 17.6 lbs. It was also used on the non-AC M42. I used the clutch assembly listed for a non-AC 1991 318i. Works great.
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I have the M40 flywheel also. Machined to 17.6 lbs. It was also used on the non-AC M42. I used the clutch assembly listed for a non-AC 1991 318i. Works great.
Does that clutch have a sprung hub?
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Yes it does, and not much noise because of it.
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What's involved in lightening a flywheel? apart from getting a machine shop you trust to shave a few kilos off it, do you have to get the thing balanced to your engine afterwards or just swap it over when you change the clutch and drive off with a big smile on your face?:D
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Cost me $100 to machine and balance at a local speed shop. Swap it.
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M42 clutch and pressure plate works with the M40 flywheel without mods.
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Only the non-AC clutch assembly will work with the single mass flywheel. AC cars have the dual mass flywheel. Totally different clutch used on each model.
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How much is the M40 flywheel? I know JB racing sells a sprung-hub aluminum flywheel here (http://www.jbracing.com/flywheel-bmw3.php)
For all the people who would like a lightweight flywheel for the M42, I'm suprised that there aren't more options...
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Keep an eye on e-bay. I found mine for $50, $25 shipping. I've seen others since then.
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Cost me $100 to machine and balance at a local speed shop. Swap it.
I've a quote for about £60, but they say they need the crankshaft to balance it - didn't realise this -do you need to remove your crank for them so they can 'run it on the balancer' :confused:
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^^ sounds like a bit of BS to me, one of the machine shops I talked to said that they have a machine that more or less "simulates" having a crank hooked to it.