Flywheel Machining

[mr_rbman]

I need my flywheel machined.

Where should i go that does a good job and is reasonably cheap?

Cheers in advance!

[Ryanrb25]

youll be lookin at 40-50bux...any local brakes specialist should be able to do it.

i machined my myself at work but i would go to kent engineering on pt rd. all depends what area you are in

Edited December 9, 2007 by Ryanrb25

[MissR34]

All Brake and Clutch at St Mary's good blokes down there!

[Nightcrawler]

I was told to NEVER machine a flywheel. Apparently even the smallest amount of machining can disrupt the integrity of the metal, and when a flywheel comes apart at 7,000rpm+, they can take your feet off, or various other nasty things.

[SLED]

I was told to NEVER machine a flywheel. Apparently even the smallest amount of machining can disrupt the integrity of the metal, and when a flywheel comes apart at 7,000rpm+, they can take your feet off, or various other nasty things.

We used to machine flywheels on a surface grinder while it was fixed on a bed with a hi-speed rotating stone wheel buzzing over it (and lots of coolant washing it simultaneously).

The deal is though, we only did it for the street boys and girls.........the serious race boys would always buy a new one!?

[Cubes]

All clutch and brake.

$50.

As above; it really depends what your doing with the car. I've always had mine machined and never any problems.

The RB flywheels are fairly foolproof; if the flywheel has been machined near dangerously thin the clutch plate will knock the flywheel bolts so you can't use it anyway.

The bloke down at all clutch brake said the metal used in the RB flywheels is quite good and doesn't suffer the problems of exploding flywheels like other manufactures do when machined.

[Pauly33GTS-t]

Cant beat that sort of knowledge. how did you find that out cubes?

[Cubes]

Its only what I've been told by all clutch brake.

In saying that my flywheel has been machined 3 times now and is very close to the bolts so I'm looking at a flywheel with near factory weight. The 3ltr doesn't really need a lighter flywheel; I'd prefer to keep a bit of weight on the end of the crank.

[Nightcrawler]

yeah sorry I must amend my advice - I was told that about SR clutch plates, but assumed it to be the same for all varieties.

[Cubes]

Would be good to know what a few other people in the field think on the RB flywheels.

The above as I said is the opinion of all clutch brake.

[Pauly33GTS-t]

Well I can tell you now. When i got my flywheel machined on the clutch change, the guy told me he had to machine the absolute shit out of mine because it was dirty as. The car had been revved to 7,000 rpm (or just under) plenty of times after and felt alot better than when I first bought the car.

[chops]

I was told to NEVER machine a flywheel. Apparently even the smallest amount of machining can disrupt the integrity of the metal, and when a flywheel comes apart at 7,000rpm+, they can take your feet off, or various other nasty things.

I was also told this, but it is for CAST flywheels - I'm unsure of the RB flywheel's construction.

The bloke down at all clutch brake said the metal used in the RB flywheels is quite good and doesn't suffer the problems of exploding flywheels like other manufactures do when machined.

They still go bang.

I did approx 35x 7000-8000rpm launches (about 30 of those at a prep'd drag track) in my R32 GTR in 8mths without any issues (best feeling in the world) but #36 has cost me about ~$15,000 (flywheel shattered, ruined my firewall, chassis rail, engine, gearbox, inner guards etc etc - the car is effectively a write-off) and has very likely put me permanently out of the import 'game'.

Pics in this thread

[Pauly33GTS-t]

^ http://www.skylinesaustralia.com/forums/in...t&p=2398344

to be exact.

dont have time to read 5 pages of shit so heres the post that matters.

[Cubes]

Yeah I did see that.

BUT.. That thread has also been cleaned up with references to the bloke who sold the flywheel/clutch combination.

Apparently it was a manufactures fault with the flywheel.

I'll try to dig up some info to be 100% sure. But from memory it wasn't a standard flywheel.

[Bl4cK32]

the std rb flywheel if machined - AND used in regular street driving wont have any problems when machined.

Most failures u hear of are from dragged or track engines. Putting around at 60km/h ive never heard a flywheel go bang.

[benm]

As has been already noted above machining the standard flywheel can lead to serious issues. For that piece of mind buy an aftermarket lightened flywheel from japan it's really not fun side stepping a clutch at 8000rpm and having chunks of metal fly around the cabin.

That gtr is still in the garage being repaired, my other gtr ive never dumped the clutch and havent revved it over 6000rpm and it certainly will never be seeing any kind of track regardless of what clutch/flywheel it has - 1 broken gtr is enough for me I dont want 2.

This is how close it came to removing my feet:

[Ryanrb25]

god dam!!!

[benm]

PS - My flywheel wasnt machined, just had a small crack in it and along with a high clamping force single plate clutch and over 30x 8000rpm clutch dumps was enough to shatter it so machining would have made it even weaker.

[Ryanrb25]

Machining something doesn't create imperfections like cracks etc...just to clarify (in 99.9 percent of cases anyway)...its the strength of a lighter one that your talking about isn't it???

[mr_rbman]

ended up taking it to all clutch and brake at st mary's, should be around $50 as cubes said, can't wait to get it back on the road as its been almost 3 months!