holeysocks Posted September 8, 2011 Report Share Posted September 8, 2011 (edited) I ask this question Once before and due to a spelling problem on my part ,,I took some grief, I was new to the car and now I have learned a little about it and would like to ask the question again..So please bear with me.. Lightening the OEM Flywheel .. I understand ,that material needs to be removed from the backside( engine side) of the fly wheel and the most popular area to remove is the hump of metal and bring that surface down even with the starter ring gear, then have the transmission side surfaced to ensure a nonslip surface,can anything be safely removed from this side?I received several ideal weights, Caliber308 suggested 32lbs,,my stock flywheel weights approx 34lb,,, BC_99 says his weights about 20 ½ lbs and said he needed to take pictures( PLEASE) , Scotty says 21,28 and 15lbs… ucw_458 had pictures, and measurments and that helped, ,but now I am confused (no comments) as to what is a realistic goal or should I say weight and still be Safe!!. Anyone with pictures and measurements or ideas would be a great help David Edited September 8, 2011 by holeysocks Link to comment Share on other sites More sharing options...
BC_99 Posted September 8, 2011 Report Share Posted September 8, 2011 keep in mind, mine was put in a cnc machine and the machinist wrote a program to cut mine down around the clutch mating surface also. Be very careful how much you cut off of the engine side as you can make the flywheel to thin and it will fail. I have seen pics of this and hopefully someone will post some for you. I wont be able to take any pics for you, as mine is in the car with the tranny and clutch all in place. keep searching around and you will get the idea. BC_99 Link to comment Share on other sites More sharing options...
kidjc Posted September 8, 2011 Report Share Posted September 8, 2011 I have a 240mm @ 22 1/4 lbs... but keep in mind... I'll be running A/C. Get too lite & it's rough on accessories. Good Luck! (maybe someone other than beer drinkers will take a stab @ my spelling as well) Link to comment Share on other sites More sharing options...
Fome Posted September 8, 2011 Report Share Posted September 8, 2011 (edited) mine was cut to 18 lbs when i got the car 420rwhp on a 2.4L did this http://i625.photobucket.com/albums/tt331/fomes9282/DSC00522.jpghttp://i625.photobucket.com/albums/tt331/fomes9282/DSC00523.jpghttp://i625.photobucket.com/albums/tt331/fomes9282/DSC00524.jpg ive always said since this if you want a light flywheel go with a fodenza Edited September 8, 2011 by Fome Link to comment Share on other sites More sharing options...
ucw458 Posted September 8, 2011 Report Share Posted September 8, 2011 mine was cut to 18 lbs when i got the car 420rwhp on a 2.4L did this ive always said since this if you want a light flywheel go with a fodenza That flywheel might have been fine on a TBI car. But 420 hp is just too much for one cut that way. Link to comment Share on other sites More sharing options...
holeysocks Posted September 8, 2011 Author Report Share Posted September 8, 2011 CRAP!! Link to comment Share on other sites More sharing options...
psu_Crash Posted September 8, 2011 Report Share Posted September 8, 2011 O my ....lucky that thing didn't hurt someone. I have been debating whether to lighten my stocker or not too. I'll be watching this. Link to comment Share on other sites More sharing options...
SidewaySStarion Posted September 8, 2011 Report Share Posted September 8, 2011 mine was cut to 18 lbs when i got the car 420rwhp on a 2.4L did this http://i625.photobucket.com/albums/tt331/fomes9282/DSC00522.jpghttp://i625.photobucket.com/albums/tt331/fomes9282/DSC00523.jpghttp://i625.photobucket.com/albums/tt331/fomes9282/DSC00524.jpg ive always said since this if you want a light flywheel go with a fodenza http://i126.photobucket.com/albums/p94/mitdr774/flywheel1.jpghttp://i126.photobucket.com/albums/p94/mitdr774/flywheel.jpg Link to comment Share on other sites More sharing options...
on4now4 Posted September 8, 2011 Report Share Posted September 8, 2011 I highly recommend you get either a competition clutch or a fodenza lightweight flywheel. Link to comment Share on other sites More sharing options...
kev Posted September 8, 2011 Report Share Posted September 8, 2011 Took mine down to 24 lbs. 21-22 is the number that was bragged about from way back in the James CNM days. I personally think 21-22 lbs is too far. Machining the engine side smooth as described in the first post is all that is needed which will give you the 24 lbs. James machined his past this point to get the 21-22. I personally do not agree at all with the Fidenza's. I know you guys love them and that they have been making this flywheel for a long time...but I simply do not like rotating masses made out of aluminum. Especailly ones that see a high heat load due to friction from the clutch. That aluminum expands/contracts like crazy depending on its temperature and its natural frequencly. Now I don't feel that they will 'blow apart' like the lightened stock flywheel above, but I do feel that the fidenza will destroy your crank bearings and rear main seal quicker than a stock flywheel. I've seen aluminum pulley's destroy crank bearings and they don't see a fraction of the heat of a flywheel..nor have the mass! Oh if you lighten your flywheel, make sure you balance it. Dynamic balancing is best but, at a bare minimum, have the machine shop do a static balance test on it. Flywheel may need to be drilled in certain areas to get it to balance correctly. If you don't have it balanced it will destroy the crank bearings and potentially shatter. To correctly lighten and balance a stock flywheel to 24 lbs, it will basically cost the same as a new Fidenza. Unless of course you work at a machine shop or have a good friend who does. Kevin Link to comment Share on other sites More sharing options...
psu_Crash Posted September 8, 2011 Report Share Posted September 8, 2011 That's good info Kev! I happen to have a friend who just yesterday told me he'd lighten mine for free if I told him where to cut Link to comment Share on other sites More sharing options...
on4now4 Posted September 8, 2011 Report Share Posted September 8, 2011 http://maxzillian.com/starion/competitionclutchflywheel1.jpg Here is a pic of the competition clutch Flywheel it is 15 LB's and is steel!! Again, i highly recommend it i do agree the fidenza is possibly too light but this think makes my car awesome to drive. I am sure if you ask anyone else that has one they will also speak very highly of it. Link to comment Share on other sites More sharing options...
DMNDSTAR87 Posted September 8, 2011 Report Share Posted September 8, 2011 i had my stocker lightened to 22lbs(stock bout 34lbs) and have had no ill effects----as stated above make sure you have it balanced after machinework finished---gig out Link to comment Share on other sites More sharing options...
holeysocks Posted September 8, 2011 Author Report Share Posted September 8, 2011 Thank You Gentlemen for the very informative post,and keep the info comming Link to comment Share on other sites More sharing options...
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