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Malte · Lowered Joined: 11 Dec 2007 Posts: 534 Location: Germany

does a lightend flywheel give more power???
why do people lighten their flywheels?!?!

thanks in advance for enlighten me :)
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Ramon2cv · Dropped Joined: 05 Aug 2007 Posts: 132 Location: Eivissa

no more power!!!

but more acceleration thats all
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stefan · Dropped Joined: 25 Aug 2007 Posts: 257 Location: holland

it will not give you any more power, so top speed, will remain unchanged. It will allow more power to reach the wheels under accelerating conditions because less energy is being wasted accelerating the engines rotating parts up to speed.

It may also result in a slightly lumpier idle, but will give faster throttle response when you hit the pedal! Much like a motorcycle, because they have no flywheels.

The gains are quite small but like all engine tuning you have to decide what you are trying to achieve. And everything should be a good balance of modifications that matches.
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TONY ENGLAND · Posted: Wed Jan 02, 2008 9:35 pm Post subject:

Also a lightened flywheel will reduce the engines hill climbing ability as it normally uses the weight of the flywheel to drive the engine when under load. If you reduce the weight, then you have to use more throttle to get the same output on hills Sad

.
(hope this makes sense???) Confused

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Punky · Posted: Wed Jan 02, 2008 11:24 pm Post subject:

I'am building a 652cc 2cv engine and asked several specialist if it was possible to fith a lightenend flywheel with this kit. They all said this flywheel will have a negative influience on the funcyioning of the engine.
So I go for a normal flywheel.

Like said before. What do you want? More acceleration, More horsepower, ...?

sivipas · Snailer Joined: 17 Oct 2007 Posts: 99

and than there is the problem of balancing the lightened flywheel. any decent machine shop can lighten a flywheel, but as far as I know it takes a special machine to balance it - in the area where I live, there is only one such machine, in a large shipyard. it spins the flywheel at 19.000 rpm to determine balancing points. I don't know if it affects engine durability if you mount unbalanced flywheel.

Bart · Posted: Thu Jan 03, 2008 9:14 pm Post subject:

Malte · Lowered Joined: 11 Dec 2007 Posts: 534 Location: Germany

so only when you need to accelerate fast a lightened wheel makes sense.
(for example when you often drive in citys?!)

the existing flywheel is propably the best mix of acceleration and
"mountain-up-drive-power".

if you change that, your engine runs not like intended.
and if the wheel is not balanced it sucks anyway.

thanks for all posts. i'm little bit more clever now.

Laughing

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sivipas · Snailer Joined: 17 Oct 2007 Posts: 99

here's a useful link
http://www.pembleton.co.uk/techpages/Flywheel.html

it also describes how to balance the flywheel yourself

Pimslet · Posted: Mon Jan 07, 2008 7:50 pm Post subject:

Hello,

In fact, the flywhell is a system that is used to stock energy. A part of the energy given by the engine is stocked when accelerating, and is destocked when decelerating. The quantity of energy stocked depend on the inertia of the flywheel, so of its weight, the less inertia, the less enrgy it stock for the same rotation speed of the engine.

The heavier, the more comfortable will be the car, but the less acceleration you will have.

The lighter, the less comfortable will be the car, but the more acceleration you will have.

If the flywheel is too lighten, the rotation of the engine will be iregular when the throtle is closed, so the minimun rotation speed of the engine will have to be encreased.

Allways balance the flywheel, or the engine bearings will die rapidly, as said it is due to the vibrations due to the fact that it is unbalaced, the strengh of the vibration increase with the rotation speed squared of the engine.

Tim2cv · Snailer Joined: 03 Jul 2007 Posts: 87 Location: Derby UK

hey, this is my fly wheel which is going to be fitted to the Ami.

http://www.facebook.com/photo.php?pid=1769721&l=67ad5&id=594675293

It has been machined and balanced.

Will let you know how it goes... the car currently has a traffic clutch which didnt seem to work...

TIM
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86 Dolly
71 Ami 8
?? AKSuper 1299cc
www.international2cvfriends.com

björn · Posted: Wed Feb 13, 2008 8:27 pm Post subject:

hi tim
what is the diverens in weight old and new?
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Etienne · Hoodrider Joined: 25 May 2007 Posts: 2829

Is this a NES flywheel?

Geoff showed me some really light one!
And I drove his Ami8 with good engine and lighten flywheel... it was really cool... The perfs are really good (in city traffic)!
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robin2cv · Dropped Joined: 18 Jun 2007 Posts: 144

hey
I drive whit a flywheel thats is lightend 2kilos I think.
It is on a 652cc visa and I never drove this engine whit a normal flywheel but I 'm pleased whit the engine behaiver.

greets robin

Tim2cv · Snailer Joined: 03 Jul 2007 Posts: 87 Location: Derby UK

Bjorn,

I will have to weigh it some time and let you know (difference between it and normal 2cv)

YES, it is the NES one from Geoff... cant wait to hit the road with it and see how it goes....

TIM
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86 Dolly
71 Ami 8
?? AKSuper 1299cc
www.international2cvfriends.com