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Flywheel Machining

mr_rbman

By mr_rbman,
in South Australia

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Nightcrawler Grand Master

Nightcrawler

Posted
Posted

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 Grand Master

SLED

Posted
Posted
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 Grand Master

Cubes

Posted
Posted

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.

Cubes Grand Master

Cubes

Posted
Posted

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

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.

Pauly33GTS-t Veteran

Pauly33GTS-t

Posted
Posted

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 Experienced

chops

Posted
Posted
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'.

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Cubes Grand Master

Cubes

Posted
Posted

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.

benm Grand Master

benm

Posted
Posted

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:

Image007.jpg

benm Grand Master

benm

Posted
Posted

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.

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