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I spoke to a clutch guru today. 

Looks like the easiest way to upgrade @- i5oogt - fully hektik clutch raping diesel Datsun will be to fit a flywheel from an RFB. A 240 mm clutch could fit the  LD flywheel, but given how much thicker the LD flywheel is, the geometry of the clutch fork will be up the fuck. (Due to the much taller profile of the turbo rfb clutch cover) but on an RFB flywheel it would be very close to the pussy 225mm clutch cover on the thicker diesel flywheel. 

The clutch guy was very concerned about the cover fitting inside the bellhousing being thicker and spaced out further. (Showed me a brand new clutch cover which had fouled inside a bellhousing and made a noise) 

A lighter flywheel.could make it sluggish on hills. But the Churbro charger will.fix that.

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What about a 240mm L series flywheel from a 280ZX? I think the RB flywheels have a 1 or 2 mm larger spigot hole which would have to be shimmed to get it concentric.

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I'm aware of the spigot difference thanks to a chat I had with @DJZ. I got a lathe, so said bush won't be hard to whip up. Rfb flywheels are lots easier to find than 280zx.

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I just phoned a mate of dad's who used to be an LD28 GURU.  (20 years ago he used to offer a drive in, drive out LD28 conversion on all manor of cars) 

He said they're way more hektik with a light flywheel*. Might not idle as lush. But go heaps harder for what it is

 RFB flywheel/clutch here we come!

 

*not his actual words.

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1 hour ago, RUNAMUCK said:

I just phoned a mate of dad's who used to be an LD28 GURU.  (20 years ago he used to offer a drive in, drive out LD28 conversion on all manor of cars) 

He said they're way more hektik with a light flywheel*. Might not idle as lush. But go heaps harder for what it is

 RFB flywheel/clutch here we come!

 

*not his actual words.

Was that Rick - he loves his LD's

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rotating mass sucks, put light flywheels on everything 

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With a non slipping clutch and a free revving lighter flywheel it's going to convert the tyres into air pollution 

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I can't see how a lighter flywheel affects anything on hills unless the flywheel weighs like 3000kg and is on a steam traction engine

idle maybe, but aside of that, meh

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Pretty much Dolan. I have a light flywheel on my sidevalve. It's only affected by a hill long enough to lose momentum on. Little rises don't matter. Just put your foot up it over the Bombay's mate

 

-i was actually faster up the kaimais with it 

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Well when you remove 5 kg on a car with 0.5 hp, you'd definitely notice the difference on hills.

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58 minutes ago, Dolan said:

I can't see how a lighter flywheel affects anything on hills unless the flywheel weighs like 3000kg and is on a steam traction engine

idle maybe, but aside of that, meh

I've always been suspicious of this thought too, and have never heard of anyone with a light flywheel complain of it.

Mind you, any car you put a light flywheel in probably has plenty of power to make it up a hill without struggling anyway, so you'd never notice.

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6 minutes ago, ajg193 said:

Well when you remove 5 kg on a car with 0.5 hp, you'd definitely notice the difference on hills.

That's pretty much my point, any effect would be 10fold on a 30hp car. So on anything decent it's a non issue

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My mate had an 808 coupe with a flywheel we took heaps off. It used to bog off the line often. 

And an A15 I had with a nice light flywheel. Used to peel.off.speed quickly with any uphill driving. (Speshly in fifth)

The blown. One did too.a.bit. but a bit more pedal made short work of it.

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Fitted chromally (sp?) flywheel to the 910 when the ca18det was in it , and it was great, but i didnt grab the super light one but was way,WAY lighter then factory and the only thing i noticed is you needed more pedal to take off because it would stall easier, thats it. 

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My RX3 had a home made billet flywheel. I never got the hang of launching it. It was bunny hop or skid. Dad lightened the flywheel in his Val ute. With the really short first gear in the w50 it's not real nice to get off the line. 

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