42 replies to this topic

[N/A-PWR]

i cant remember where but im sure i read somwhere that light flywheels on supercharged engines had less of an effect on the idle qualitys of an engine.

as in it didnt want to stall or be a pig takeing off etc. any thoughts on that??

 

I can see the Supercharger being a flywheel mass in itself. Dave I

[Uncle Chop Chop]

i cant remember where but im sure i read somwhere that light flywheels on supercharged engines had less of an effect on the idle qualitys of an engine.

as in it didnt want to stall or be a pig takeing off etc. any thoughts on that??

Probably more due to the increased low end torque.

[ozyozyozy]

used to have a light steel flywheel10kg and single plate clutch 10kg. Had problems with trying to rev the engine up on the downshift when heel and toeing, had to giv it a big stab. Spoke to alot of people, small clutches are great for racing but bad for street, they can't handle the heat soak of stop start. Had a clutch and flywheel made by alloy race components. Alloy flywheel 3kgs and a twin plate 9 inch clutch works great, the ONLY issue I have at lower speeds it dosent hold steady rpm, jst use a lower gear. this can be changed by using a steel flywheel. Drives just like a standard clutch good for far more HP then I have. Total weight clutch and flywheel 12kgs.

[TerrA LX]

I would assume running an alloy flywheel needs a special compound for the clutch and would also mean having an alloy pressure plate?

[A9X]

As Datto says, we put a fair bit of thought into it and in the end went with ian tates recomendation of a yella terra 10 kg job. Still going strong

[dattoman]

Alloy flywheel still has a steel insert for the clutch to run on

Also made by Alloy race components in Vic

 

I used to run a ceramic button clutch with a pressed steel pressure plate

 

[TerrA LX]

Ok, had visions of someone trying to run a clutch on a alloy face for some strange reason, thanx for clearing that up.

 

By pressed steel pressure plate you mean the hat or clutch cover?

 

The pressure plate (the face that backs the clutch) would have to be similar steel to what the face of the flywheel is?

 

I know a few people who run a steel flywheel (because than are safer than a cast steel one) but still run a cast steel pressure plate.

[dattoman]

Just a standard clutch cover

Pressed steel hat and cast iron baseplate

With alittle more clamp pressure

[76lxhatch]

I know a few people who run a steel flywheel (because than are safer than a cast steel one) but still run a cast steel pressure plate.

 

They're all cast (before machining) aren't they? Factory flywheels are more iron than steel is all, hate to think what a true billet item would cost

[TerrA LX]

Well if you put it like that then even a billet is cast before machining...

[76lxhatch]

I guess, although I always understood the process of creating a billet to be a little more than straight casting though. Generally a part is either cast and machined, machined from a billet, or forged.

 

I would expect the likes of the Yella Terra flywheels to be plain old cast, just more steel than iron unlike the factory items. Although now I do wonder whether billet steel flywheels fit into the low-mid budget range or are highly expensive items only...? (true billet wheels are certainly 4-5x more expensive)

[Dave6179]

Mate of mine used to make aluminium flywheels for his, and others racecars...way before Commodores were invented.

[TerrA LX]

I guess, although I always understood the process of creating a billet to be a little more than straight casting though. Generally a part is either cast and machined, machined from a billet, or forged.

 

 

Most all steel (in layman's terms) is melted and poured (cast) just as an iron engine block is poured into a sand cast, steel is poured into a solid block, this is the billet that something is machined out of.

 

Forged is steel that has been cast as a rod/cube/flat bar etc then stamped in a die.

[76lxhatch]

Yes but a "cast" flywheel is cast into that shape as opposed to into a billet which is subsequently machined with much waste into the shape, and I also thought additional steps are involved in the casting of billets?

[N/A-PWR]

I worked at BHP Newcastle where the Bloom Mill makes Hot rolled 4"x 4"x 150 foot lengths, then are carted when cold to the Merchant or Rod mill to be Cold rolled into sections, ie - rod, angle, flat bar etc, which is kind of forging by continous rollers. Dave I

[76lxhatch]

Haha so I was wrong on both counts then, they're more like forged and machined. At any rate good to know how they're made and like TerrA said less prone to self destruction than factory cast iron. Sorry for deviation from topic...