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Malte Lowered
Joined: 11 Dec 2007 Posts: 534 Location: Germany
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Posted: Wed Jan 02, 2008 7:00 pm Post subject: flywheel?! |
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does a lightend flywheel give more power???
why do people lighten their flywheels?!?!
thanks in advance for enlighten me :) _________________ in rust we trust... |
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Ramon2cv Dropped
Joined: 05 Aug 2007 Posts: 132 Location: Eivissa
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Posted: Wed Jan 02, 2008 7:10 pm Post subject: |
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no more power!!!
but more acceleration thats all _________________ rent a car and a lifestyle |
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stefan Dropped
Joined: 25 Aug 2007 Posts: 257 Location: holland
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Posted: Wed Jan 02, 2008 7:15 pm Post subject: |
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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 Lowered
Joined: 09 Aug 2007 Posts: 742 Location: MALDON, ENGLAND, UK
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Posted: Wed Jan 02, 2008 9:35 pm Post subject: |
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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 .
(hope this makes sense???) _________________ If it works ok, "LEAVE IT THE FUCK ALONE". |
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Punky Dropped
Joined: 18 Jun 2007 Posts: 361 Location: Netherlands
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Posted: Wed Jan 02, 2008 11:24 pm Post subject: |
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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, ...? |
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sivipas Snailer
Joined: 17 Oct 2007 Posts: 99
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Posted: Thu Jan 03, 2008 7:28 pm Post subject: |
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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. |
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Bart Lowered
Joined: 17 Jun 2007 Posts: 783 Location: Södertälje
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Posted: Thu Jan 03, 2008 9:14 pm Post subject: |
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Quote: | I don't know if it affects engine durability if you mount unbalanced flywheel. | As far as I'm aware yes, because it can cause strong viberations which are uncomfortable as well. |
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Malte Lowered
Joined: 11 Dec 2007 Posts: 534 Location: Germany
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Posted: Thu Jan 03, 2008 10:51 pm Post subject: |
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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.
_________________ in rust we trust... |
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sivipas Snailer
Joined: 17 Oct 2007 Posts: 99
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Pimslet Snailer
Joined: 14 Nov 2007 Posts: 52 Location: France Nièvre Nevers Magny Cours
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Posted: Mon Jan 07, 2008 7:50 pm Post subject: |
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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.
Quote: | 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 .
(hope this makes sense???) |
In fact, it won't change anything on the top speed that you will climb, but you will loss you speed more rapidly, because the flywheel has got less energy to give. _________________ Always trying to gets more power on my AZLP, fortunately the fuel has been cheaper for one month. |
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Tim2cv Snailer
Joined: 03 Jul 2007 Posts: 87 Location: Derby UK
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björn Lowered
Joined: 19 Jun 2007 Posts: 1695 Location: hillywood(hilversum)/holland
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Posted: Wed Feb 13, 2008 8:27 pm Post subject: |
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hi tim
what is the diverens in weight old and new? _________________
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Etienne Hoodrider
Joined: 25 May 2007 Posts: 2829
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Posted: Wed Feb 13, 2008 9:27 pm Post subject: |
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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)! _________________ www.super2cv.com |
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robin2cv Dropped
Joined: 18 Jun 2007 Posts: 144
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Posted: Wed Feb 13, 2008 11:44 pm Post subject: |
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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 |
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Tim2cv Snailer
Joined: 03 Jul 2007 Posts: 87 Location: Derby UK
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Posted: Fri Feb 15, 2008 8:49 pm Post subject: |
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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 _________________ 86 Dolly
71 Ami 8
?? AKSuper 1299cc
www.international2cvfriends.com |
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