Jono51 58 Report post Posted February 2, 2009 Hi All, I'm curious to know the difference in flywheel weights,from E30 (without the crank sensor on the transmission) Does anyone here, know how much a standard 318, 320 and 325i flywheel weights would be. greatly appreciated Jon Quote Share this post Link to post Share on other sites
Silver Fox 43 Report post Posted February 2, 2009 M20 8.13kg, M40 8.89kg, these are the minimun weights for the race series, so will be very close to standard weight. Quote Share this post Link to post Share on other sites
Jeddy 0 Report post Posted February 2, 2009 OT, but fly wheel related, who do you take a flywheel to to be lightened? Are there specialists for this sort of thing? Quote Share this post Link to post Share on other sites
westy 614 Report post Posted February 2, 2009 Engine balancer. Also how different is the m10 flywheel? Quote Share this post Link to post Share on other sites
Jono51 58 Report post Posted February 2, 2009 Engine balancer. Also how different is the m10 flywheel? also interested to know M10 weight too!! Quote Share this post Link to post Share on other sites
Guest FrantiC Report post Posted February 2, 2009 m10 one is 18lbs. About 8.2KG. Quote Share this post Link to post Share on other sites
CamB 48 Report post Posted February 2, 2009 m10 one is 18lbs. About 8.2KG. I'm not so sure about that - the one in my garage is single mass so I'd say its lighter - maybe 6kg. I'm also not sure you can lighten a dual mass one much safely. Quote Share this post Link to post Share on other sites
westy 614 Report post Posted February 2, 2009 how about the physical dimensions of the m10 fly? Same bolt pattern? diameter? etc Quote Share this post Link to post Share on other sites
Guest FrantiC Report post Posted February 2, 2009 how about the physical dimensions of the m10 fly? Same bolt pattern? diameter? etc I doubt it. m10 shares the same bellhousing as the m30 and s14 (e30 m3). I am guessing the flywheel would be of a different diameter, not sure if larger or smaller though. Quote Share this post Link to post Share on other sites
CamB 48 Report post Posted February 2, 2009 I doubt it. m10 shares the same bellhousing as the m30 and s14 (e30 m3). I am guessing the flywheel would be of a different diameter, not sure if larger or smaller though. It looks like the flywheel is about the same diameter, but the clutch is smaller, and the ring gear is definitely different (so you'd need to swap the ring gear or the gear on the starter, or the starter if they swap). The only way to find out would be to try it, which would be expensive and a hassle if its wrong. Quote Share this post Link to post Share on other sites
Jono51 58 Report post Posted February 2, 2009 this is getting interesting thanks for the help guys, The reason I've asked is because I've done a manual conversion in a 2.5,I was supplied a flywheel, that I wasn't too sure what it was from. I held an m20 2.5 flywheel in one hand and the unknown in the other , (should have weight them at the time) so I put the lighter of the two in and now have the common aspects of a lightened flywheel, hard to lift off idle, no torque at the bottom end, a rattle at low revs ( apparently common with lighter flywheels) and awesome acceleration. the flywheel I installed had no part numbers, but appered to look ressembly standard, so was curious that I'd been supplied an M10 or something. Quote Share this post Link to post Share on other sites
CamB 48 Report post Posted February 2, 2009 the flywheel I installed had no part numbers, but appered to look ressembly standard, so was curious that I'd been supplied an M10 or something. Possibly M20 from a 323i. Quote Share this post Link to post Share on other sites
c.robertson00 11 Report post Posted February 2, 2009 Why dont you just lighter the original one? Its not that expensive. Quote Share this post Link to post Share on other sites
tire 10 Report post Posted February 2, 2009 Are you talking about the flywheel I left in your mailbox Jono? That was 100% definitely from an m10. Quote Share this post Link to post Share on other sites
CamB 48 Report post Posted February 2, 2009 I could swear the ring gear teeth were totally not the same between an M10 and an M20 flywheel. I could also swear the M10 clutch was the smaller size - 215mm - compared to the M20 (or 2002tii) 228mm. Are you using the larger clutch and flywheel with the smaller machined surface? But I could be talking out my arse. Quote Share this post Link to post Share on other sites
Jono51 58 Report post Posted February 2, 2009 Are you talking about the flywheel I left in your mailbox Jono? That was 100% definitely from an m10. nah the one you supplied was incorrect that was an automatic flexplate, but cheers anyways Quote Share this post Link to post Share on other sites
Jono51 58 Report post Posted February 2, 2009 Why dont you just lighter the original one? Its not that expensive. flywheel is already in, no point in lightening it anymore! it already seems to be light enough lol the whole idea I started this thread , was to get an indication that maybe there was a possiblity that some e30 flywheels were different in weight, inter-changable, and to see if I'd possibly installeda 318 M10 one onto my 325 Quote Share this post Link to post Share on other sites
Jono51 58 Report post Posted February 3, 2009 I could swear the ring gear teeth were totally not the same between an M10 and an M20 flywheel. I could also swear the M10 clutch was the smaller size - 215mm - compared to the M20 (or 2002tii) 228mm. Are you using the larger clutch and flywheel with the smaller machined surface? But I could be talking out my arse. tell ya what , I've got an m20 flywheel in the garage, and a ring gear off an M10 I'll compare, and let ya know i'm curious to see the difference Quote Share this post Link to post Share on other sites
CamB 48 Report post Posted February 3, 2009 I reckon the M10 has less teeth and while its a similar (or the same) outside diameter, it has a smaller machined surface for the smaller clutch. And I want a cookie if I am right Quote Share this post Link to post Share on other sites
QuickSilver 0 Report post Posted February 4, 2009 I once read, and I'm 95% sure that it was just beer talk, that the early m20b20 I think pre 85 flywheel was lighter than the post 85. Has anyone heard this before or can verify? I thought I'd chuck it in here because its relevant. Quote Share this post Link to post Share on other sites
CamB 48 Report post Posted February 4, 2009 ETK implies that pre 9/1984 was lighter: http://bmwfans.info/original/E30/2-T/320i-...11/ill-11_0286/ Quote Share this post Link to post Share on other sites
