The loss of inertia storage capacity makes the car easier to stall and may idle less smooth.

 

YouTube - Public Race Days 2009 Explosion Part 1

if done by a cow boy...

 

Oooooooh yeah thats nasty, thats what happens if you over lighten a cast flywheel

Boooooooooooooooooooom shaka laka lmao

 

EDITED Cant be arsed

 

there are no downsides, if you want your car to perform better a lighter flywheel is one of the best things you can do, simple as that!

Was going to post this also, no downsides in the real world bum dyno

 

your revs will drop more in between gears

 

Yeah on my mini trackday car I pretty much had no choice but to heal and toe it cause of that, especially as it was a high comp engine, its amazing quite how quickly the revs come down compared to on a normal weight one.

 

I asked this question recently

I drove a Calibra V6 this week with a Courtenay 5.7kgs flywheel in it. Revved quicker and was still easy to drive. Only difference was it seemed like you had to press the throttle more often than you do on mine if that make sense, probably because the revs drop quicker. Made a big improvement to accelleration.

However, it somehow didn't feel like a V6 anymore. Was quick like a V6, but felt more like a tuned C20XE than a smooth V6.

I know it's only my opinion, but thought I'd mention it anyway I would think on a 2 litre it will just feel quicker with no drawbacks

 

It depends on how light you go, there is an optimum weight for any application and in the case of the standard v6 its FAR too heavy

Xe one if you lighten it is a bit is good, but there definately start being downsides when you get mega light.

 

So the conclusion is:

No drawbacks as such in a "normal" car with a "normal" lightend flywheel, driven in "normal" circumstances

 

So the conclusion is:

No drawbacks as such in a "normal" car with a "normal" lightend flywheel, driven in "normal" circumstances

what is ''normal''??

 

I came on to get some opinions to satisfy my curiosity after having a disagreement with a member from here over on another forum.

I won't be changing my flywheel, well at least not until it inevitably chews its self up, being a dual mass jobby.

 

There is only one reason why we disagree, and thats becuase the things that were being said were incorrect..

You were trying to tell me that a lighter flywheel will reduce engine braking, and thats simply not true, it will increase.

then after you realised i was right you came full circle and said it would effect drivability..wtf..

Maybe when you change your flywheel you can buy a heavier one and increase drivability and engine braking!

 

Exactly my point at the very beginning

 

how is the torque affected with a lighter flywheel???

 

it isnt effected at all, your engine makes the same power with a heavy, light or even no flywheel bolted to it... its rubbish.

 

Forget linking it to threads you just found on google........... its simple high school physics.... up hill down hill on a corner in a field...

You said it yourself the flywheel stores energy, if a lighter flywheel stores less energy it will be slowed down easier on over run.

 

But you also said a lighter wheel will be turned easier, therefore it is easier for the wheels to turn the engine - hence my comment about going downhill.

See my point?

 

yeah but your slowing down,

Lets look at it a different way, your in a car with a heavy flywheel at 40mph and you lift off the heavy flywheel has more stored energy in it rotation keeping you rolling for say 300 yards.

if you then put a flywheel half the weight on it you are reducing the stored rotational energy and therefore the car has less energy to keep it moving and wont be able to roll for the same amount of distance.

make sense now?

 

oh right, so a lightened fly doesnt make a difference to the torque going to wheels, eh???

you will have a PM from me in the near future if you make non-vaux stuff

 

Make pretty much everything, and if we dont ill make you what you need.

 

Biggest downside to a lightened flywheel is something like this happening:

 

, that must have been emotional

 

that might be a downside to a "lightened" flywheel, but not a "lightweight" flywheel!!!!!!!!!

The weight loss talked about in this thread can't be achieved by machining a std cast flywheel, or it will indeed be likely to go bang. However, fitting a lightweight steel flywheel will reduce the chances of the above disaster compared to a std flywheel, as the steel one is much stronger!

 

Problem is with the cast flywheels when lightened, even if they are lightened correctly and sensibly, cast flywheels will crack with repetative expansion and contraction... so you think its safe untill one day Kbooooom, so unless you check it regularly for stress cracks you never really know if its ok or not.

Even the lightest steel flywheels we make will exceed 20,000rpm and wont crack.

I looked abit closer at that footage, looks like most of the flywheel came out of the bonnet and the clutch came out of the front

you can see it here

 

vxlgsi, this is exactly why people going for a lightweight flywheel should be getting one off someone like yourself who makes a proper item

 

There have been quite a few Mini 7 racers who've received nasty leg injuries from exploding flywheels/clutches and I believe there've been at least two fatalities!

A clutch explosion is why 'Big Daddy' Garlitts built the first rear engine dragster - he'd lost half his foot in the accident.

 

wasn't going to say it but will now you have, I find the same with my se7en, I'm crap at heel and toe, but you have to or you'll lock rears into corners with a light flywheel, the engine braking is a lot more fierce

 

I have just had fully adjustable floor mounted pedals put in so I can now set them up for good heel and toe

 

I have bottom pivot pedals, but I need to modify the setup a bit. As it was a road car I made the pedal box to suit clumsy trainers, but that makes heel and toe tricky! Having said that, I'm still rubbish at it in the caterham R400 race car as well so hey ho!!

 

Ive been in a corsa v6 with a lightweight fly and it seem to accelerate alot faster, When i come to a hill at a constant RPM (Keeping my foot still) car the seem to slow down due to the loss of mass on the fly, but when i put my foot down to regain speed it still seemed to pull harder

so in my eyes its better to have a lightweight fly as the engine does not need to use as mush power to move the rotational mass of the engine (Aswell as the cars mass)