yoeddynz Posted October 16, 2012 Share Posted October 16, 2012 Would mild steel be suitable enough to make a flywheel from? I realise it will be strong enough but my fear is that the friction area would not hold up. I figure cast iron is used not just for ease of manufacturing odd shaped flywheels but Also because it has good resistance to wear. Other option would be alloy with a set in peice of steel for the clutch. But this would cost heaps- for the alloy alone. Quote Link to comment Share on other sites More sharing options...
Ogre Posted October 16, 2012 Share Posted October 16, 2012 Wouldnt it need to be the same material/harndess as the pressure plate or wouldnt you get some weird clutch shudder and stuff going on? Quote Link to comment Share on other sites More sharing options...
Raizer Posted October 16, 2012 Share Posted October 16, 2012 Theres lots of places selling steel flywheels, think they use a high carbon steel for them Quote Link to comment Share on other sites More sharing options...
Spencer Posted October 16, 2012 Share Posted October 16, 2012 Yea there are millions of custom billet steel flywheels out there, find a friendly engineer who does this allot to help you out. Possibly look at the places that do all the 1UZ & JZ flywheels, Im sure someone on here will know someone Quote Link to comment Share on other sites More sharing options...
sheepers Posted October 16, 2012 Share Posted October 16, 2012 4340 or P20. probably get away with 4140 too. if you're desperate i can ask the metallurgist at Heat Treatments what people usually make flywheels out of. Quote Link to comment Share on other sites More sharing options...
flyingbrick Posted October 16, 2012 Share Posted October 16, 2012 yes, 4140 or 4140HT if available ( never used it myself) Quote Link to comment Share on other sites More sharing options...
yoeddynz Posted October 16, 2012 Author Share Posted October 16, 2012 4130- I thought was stronger not harder? Dave- yes please ask. And of specialists making flywheels- any good ones I should try? I'll ask about locally. I'm happy to make it but just need the stock. Quote Link to comment Share on other sites More sharing options...
KKtrips Posted October 16, 2012 Share Posted October 16, 2012 MP Autoparts in Wellington make them or get them made - possibly by some outfit in Wanganui IIRC... Quote Link to comment Share on other sites More sharing options...
yoeddynz Posted October 16, 2012 Author Share Posted October 16, 2012 The reason i was planning to make a flywheel was because the V6 item is 20mm smaller than the rx7 one and sarter wouldnt line up. I have thought of another thing I could do. I could machine up a spacer ring to fit between v6 flywheel and rx7 ring gear. ? Quote Link to comment Share on other sites More sharing options...
KKtrips Posted October 16, 2012 Share Posted October 16, 2012 Arn't rotary flywheels heldon by one huge centre nut and a taper while V6 ones held by 6-8 M12 (ish) bolts Quote Link to comment Share on other sites More sharing options...
Raizer Posted October 16, 2012 Share Posted October 16, 2012 Arn't rotary flywheels heldon by one huge centre nut and a taper while V6 ones held by 6-8 M12 (ish) bolts Yeap.I believe he is trying to use a rotary gearbox behind the v6, not the rotary flywheel. Quote Link to comment Share on other sites More sharing options...
KKtrips Posted October 16, 2012 Share Posted October 16, 2012 Oh - duh.. my bad.. Quote Link to comment Share on other sites More sharing options...
yoeddynz Posted October 16, 2012 Author Share Posted October 16, 2012 Yeap. I believe he is trying to use a rotary gearbox behind the v6, not the rotary flywheel. Yep thats the one. Quote Link to comment Share on other sites More sharing options...
Dell'orto Posted October 16, 2012 Share Posted October 16, 2012 Colliers in Levin do custom flywheels, give them a bell and see if they'll tell you what they use. Fidanza alloy flywheels use what looks to be a cast iron ring bolted on where the clutch would sit, may be feasible? Quote Link to comment Share on other sites More sharing options...
yoeddynz Posted October 16, 2012 Author Share Posted October 16, 2012 Yeah I think that's what I have seen. Bolted in with set back countersunk head bolts. I wonder how thick the cast piece is? I'll give them a ring and ask. Quote Link to comment Share on other sites More sharing options...
sr1600 Posted October 16, 2012 Share Posted October 16, 2012 I have one of those alloy flywheels with clutch plate face bolted on with countersunk bolts, It looks good and has a workshop name punched in the back of it etc I just didnt like the fact that for a 13b flywheel it could be spun up to around 10000rpm and the only thing holding it on was 6 bolts through some alloy so stayed with a steel one. There are two different diameters of rotary pp around 215mm and 225mm I think what size is the v6 one Should be fun in the viva have to watch it in the wet Quote Link to comment Share on other sites More sharing options...
ruin41 Posted October 16, 2012 Share Posted October 16, 2012 What about bolting a rotary auto flexy plate behind the flywheel ? They arent very thick and hold the ring gear for the starter. No idea if the shape will allow you to do this. You could have an outer ring cut from it or anything of the same size so it fits your flywheel and just weld it to the existing ring gear. Quote Link to comment Share on other sites More sharing options...
sentra Posted October 16, 2012 Share Posted October 16, 2012 I have a xr6 engine with a flexplate with nothing bolted to it, just for the starter (the driveshaft comes off the crank nose), it rings like a church bell when the starter is engaged. Quote Link to comment Share on other sites More sharing options...
yoeddynz Posted October 17, 2012 Author Share Posted October 17, 2012 Bloody good idea!!!! I think 12a and 13b auto flex plates would be the same and plenty of 13b auto stuff out there cheap eh. The Mazda rotary ring gear measured up at 300mm OD and weighs in at around 15kg standard! The Mazda V6 item is 280mm OD and weighs in at 8kg. I was reluctant to have to add to that. Once I pull the engine out from the eunos I can have a look at how I could attach a rotary flex plate to it. Anyone got a rotary flex plate kicking about?.... Quote Link to comment Share on other sites More sharing options...
RUNAMUCK Posted October 18, 2012 Share Posted October 18, 2012 A million years ago, I got a custom steel rotang flywheel made. When I popped the 13b in my rx3, I bought an import engine to replace it. It had been in front of an Auto. The Manual flywheel is only held on by the one Big arse nut. But my new engine had like a counterweight, with a 6 bolt flange for the flexplate. was all set to swap my old f/wheel onto the new donk. BUt as the rear seal journal was on the flywheel, Dad insisted I spoke to an expert, to get the dilly on what was what. The dude from rotary research, told me that my old flywheels inbuilt counterweight probably wouldn't be right for my new engine. So I bought a pretty hefty billet of steel, and the old boy took some measurements off the old flywheel. Then he tuned up a new one, and refitted the old ring gear. It worked a treat. Although it was a little on the light side. I never quite got the hang of launching it. It was either a bunny hop, or a peel out. The old boy still has the lathe in question. At a pinch he might be able to make something up. Quote Link to comment Share on other sites More sharing options...
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