Ridal Posted December 17, 2012 Share Posted December 17, 2012 I'm about to install a standard K series flywheel which has been cut down to 4.8kg. Is there a reasonable risk of it shattering? I'll be using an organic clutch so it shouldn't get too hot but it's pretty thin compared to a standard item which weighs around 10kg. Quote Link to comment Share on other sites More sharing options...
Yowzer Posted December 17, 2012 Share Posted December 17, 2012 There's only one way to find out. 1 Quote Link to comment Share on other sites More sharing options...
Ridal Posted December 17, 2012 Author Share Posted December 17, 2012 That's right. I'm mainly concerned that it could destroy my K-T bellhousing which are quite hard to come by. Quote Link to comment Share on other sites More sharing options...
Yowzer Posted December 17, 2012 Share Posted December 17, 2012 Best bet would be to take it to an engineering shop which deals with flywheels. They'd give you the best advice on it. Quote Link to comment Share on other sites More sharing options...
Nominal Posted December 17, 2012 Share Posted December 17, 2012 Is it a cast flywheel? If so I'd be nervous. Quote Link to comment Share on other sites More sharing options...
KKtrips Posted December 17, 2012 Share Posted December 17, 2012 How radical is your motor? A very light flywheel is one of those things that's as much a pain in the bum as it is performance so unless you have a motor that needs to rev fast then just ditch it. The side effects it causes, never mind the shit could go wrong with an exploding flywheel, is not worth it for me. Also if it is factory then it's most likely cast and a lightened cast flywheel is considered dangerous. Quote Link to comment Share on other sites More sharing options...
Ridal Posted December 18, 2012 Author Share Posted December 18, 2012 It is cast. The engine is built for performance and is I've got a more aggressive cam and side drafts to install in the near future so I think it will benefit from the lighter flywheel. The cam grind is purely for peak power so drivability is not high on the list. Quote Link to comment Share on other sites More sharing options...
to4garret Posted December 18, 2012 Share Posted December 18, 2012 i wouldnt worry, the steel ring gear will hold it together 1 Quote Link to comment Share on other sites More sharing options...
Nominal Posted December 18, 2012 Share Posted December 18, 2012 It's not the clutch which is a worry really, it is the ability of the cast iron to hold togther at high RPM. If you want to run it, put a good scattershield in place. Or go shopping for a steel item. http://www.fortyone.co.nz/parts/view/11502.html Quote Link to comment Share on other sites More sharing options...
Ridal Posted December 18, 2012 Author Share Posted December 18, 2012 Has anyone actually had a flywheel let go on them? Quote Link to comment Share on other sites More sharing options...
KKtrips Posted December 18, 2012 Share Posted December 18, 2012 I've been hit in the head with fragments of bellhousing. I've also seen the aftermath many times. Quote Link to comment Share on other sites More sharing options...
Snoozin Posted December 18, 2012 Share Posted December 18, 2012 I have experienced the result of an Alfa twincam flywheel flying to pieces right next to me as the car launched off the line. It had been "lightened" also. Fuck what a mess/scary thing. Shrapnel dug considerable divots in the tarmac too. Quote Link to comment Share on other sites More sharing options...
Steelies Posted December 18, 2012 Share Posted December 18, 2012 yikes. is the performance increase worth the safety risk? Quote Link to comment Share on other sites More sharing options...
JoKer Posted December 18, 2012 Share Posted December 18, 2012 lul performance increase {i wouldnt consider it that] the ability to raise its revs rapidly is about all its good for, no? (yea ok by default acceleration is increased BUT not the power) I just contradicked myself aye Quote Link to comment Share on other sites More sharing options...
sentra Posted December 18, 2012 Share Posted December 18, 2012 they(whoever that is) say that lightened cast flywheels explode due to heat from lame clutches and ghetto racing should be done with lightened c.i flywheel, huge cover pressure & puck type plate to transfer heat to tyres. Quote Link to comment Share on other sites More sharing options...
chriscross Posted December 18, 2012 Share Posted December 18, 2012 iv seen a r32 at pukie drift comp a couple of years ago, its flywheel was lighten and when it let go it went thow the fire wall, dash and bonnet etc! some of the fiywheel landed in the car park lol! that put me off lighting my one for sure! Quote Link to comment Share on other sites More sharing options...
flyingbrick Posted December 18, 2012 Share Posted December 18, 2012 get a billet one made. easy Quote Link to comment Share on other sites More sharing options...
RUNAMUCK Posted December 18, 2012 Share Posted December 18, 2012 I've run plenty of lightened A series datto Cast flywheels. I even have a book printed by nissan showing where to lighten them for racing. I've never thought twice about running them. Quote Link to comment Share on other sites More sharing options...
KKtrips Posted December 18, 2012 Share Posted December 18, 2012 they(whoever that is) say that lightened cast flywheels explode due to heat from lame clutches and ghetto racing should be done with lightened c.i flywheel, huge cover pressure & puck type plate to transfer heat to tyres. Huh???However if Ridal is questioning if flywheels actually do disintegrate - then I can tell you it's a fact. At the end of the day in answer to your question then yes you can run a lightened flywheel and yes it "may" explode.. There are pro's and con's as indicated above - but it's at a risk if it's not a proper light flywheel and only you can determine if you are willing to take that risk. Quote Link to comment Share on other sites More sharing options...
cletus Posted December 18, 2012 Share Posted December 18, 2012 That's right. I'm mainly concerned that it could destroy my K-T bellhousing which are quite hard to come by. haha. id be more worried about being able to walk still. 2 Quote Link to comment Share on other sites More sharing options...
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