I was just browsing around the net and came across a site that sells PERFORMANCE LIGHT WEIGHT FLYWHEELS and i said why. If anything I would want a heavier flywheel. THATS THE MAIN SOURCE OF TORQUE ON A 4cyl.

Or are they for stock motors and maybe match its HP range so the flywheel doesnt bog the stock civic so much at the line????

Anyone have an answer to this????? thanx

 

Removing weight from the rotating parts of the car allows the engine to provide more power accelerating the car and not the drive train. The flywheel provides no torque to the engine so the logic that it is the main source of torque for the four cylinder is flawed.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MrPink69 &raquo;</TD></TR><TR><TD CLASS="quote">
. THATS THE MAIN SOURCE OF TORQUE ON A 4cyl.
</TD></TR></TABLE>

funny i always thought it was the engine. anyway as said earlier it will let the engine rev faster and in theory make more power since the engine has less weight to spin. most people agree that it will net you faster et's but not improve trap speed. personally i have a 10lb chromoly ACT that i really like.

 

alls the lightened flywheel will help is revving, you would probably gain a couple hundred rpms up top, and it'll get there quicker, however this isn't ideal for daily driving as the motor also loses revs much quicker, its not too much of a nuisence once you get used to the way it reacts.

 

yesssssss, that answered nothing And the flywheel does create torque and lots of it on a 4cyl. Torque is, (in easy words) the weight spinning( crank, flywheel mainly) and gaing momentum helping to turn your motor. And sure you would accelerate off the line a lil faster with a lighter one but youd have no top end cause ud have no torque.

so please can someone that knows what theyre talkin about explain the reason for performance lightweight flywheels.

 

that goes to the first post!!! you bastards are to fast at posting lol or maybe im slow?

 

you should do a search mrpink69! if lightened flywheels are so bad why do all of the top racers use them? and i speak from experience because i have a fidanza 8lb flywheel and i dont really feel any huge difference in anything except it revs alittle quicker and its alittle harder to start from a stop. but after a few hours it feels just like stock! so you do what you would like to your car but i can bet if you ask anyone that HAS a lightened flywheel in their car they would say that they like it better than stock!!!!!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MrPink69 &raquo;</TD></TR><TR><TD CLASS="quote">yesssssss, that answered nothing And the flywheel does create torque and lots of it on a 4cyl. Torque is, (in easy words) the weight spinning( crank, flywheel mainly) and gaing momentum helping to turn your motor. And sure you would accelerate off the line a lil faster with a lighter one but youd have no top end cause ud have no torque.

so please can someone that knows what theyre talkin about explain the reason for performance lightweight flywheels.</TD></TR></TABLE>

I know what I am talking about. There is no way for a flywheel to create torque. Torque is defined as:

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Dictionary &raquo;</TD></TR><TR><TD CLASS="quote">1. The moment of a force; the measure of a force's tendency to produce torsion and rotation about an axis, equal to the vector product of the radius vector from the axis of rotation to the point of application of the force and the force vector.
2. A turning or twisting force. </TD></TR></TABLE>

The weight of the flywheel has nothing to do with torque. What you are thinking of is inertia of an object in motion, which is defined by Newtons first law of motion:

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Newton &raquo;</TD></TR><TR><TD CLASS="quote">I. Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it. </TD></TR></TABLE>

So, a flywheel's weight has nothing to do with how much torque is produced.

 

booooyeah!!!!!!!!!!!

Aside from the old drag racers' arguments, the lighter rotating assembly provides easier rev matching and better response on a road course.

 

Hmmmmm look at that definition of torque( the measure of a force's tendency to produce torsion and rotation about an axis) reading that definition would you not think that more mass on the axis would create more torsion and rotation in turn creating more torque.

or the other thing i was wondering was is; maybe the weight of a stock flywheel is to great for the power of a stock motor and just bogs it down off the line to much because the motor doesnt create enough power to turn the heavier flywheel so these light weight flywheels are made more for the stock power ranges maybe? if so, it is probably better to keep your stock flywheel or get a heavier one once you start creating more power correct?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MrPink69 &raquo;</TD></TR><TR><TD CLASS="quote">Hmmmmm look at that definition of torque( the measure of a force's tendency to produce torsion and rotation about an axis) reading that definition would you not think that more mass on the axis would create more torsion and rotation in turn creating more torque.

</TD></TR></TABLE>

You are still confusing tq with inertia. The engine turns the flywheel, not the other way around.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MrPink69 &raquo;</TD></TR><TR><TD CLASS="quote">Hmmmmm look at that definition of torque( the measure of a force's tendency to produce torsion and rotation about an axis) reading that definition would you not think that more mass on the axis would create more torsion and rotation in turn creating more torque.

or the other thing i was wondering was is; maybe the weight of a stock flywheel is to great for the power of a stock motor and just bogs it down off the line to much because the motor doesnt create enough power to turn the heavier flywheel so these light weight flywheels are made more for the stock power ranges maybe? if so, it is probably better to keep your stock flywheel or get a heavier one once you start creating more power correct? </TD></TR></TABLE>

Ok, please educate me in the area of physical motion, since I obviously don't know what I am talking about.

 

Boys...if he doesn't see it yet....he's not gonna

 

A heavy flywheel does not create TQ, but it does store it. IE a 200 lb flywheel will take longer to get to 8000 RPMs than a 10 lb. but will stay spinning longer when power is shut off. Kinda like slowing down an oil tanker compared to a Cris Craft.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DonF &raquo;</TD></TR><TR><TD CLASS="quote">A heavy flywheel does not create TQ, but it does store it. IE a 200 lb flywheel will take longer to get to 8000 RPMs than a 10 lb. but will stay spinning longer when power is shut off. Kinda like slowing down an oil tanker compared to a Cris Craft. </TD></TR></TABLE>

Inertia

 

Inertia is what you have to overcome to get it moving, TQ is what is actually measured when you try to stop or load it.

 

ohhhhh ok well that helps good stuff thanx

 

The reason for my confusion is because i was thinking about the crank. if you were install a heavier crank you would get a lot more torque. So i figured putting some more weight on the crank say like with a heavier flywheel you would get more torque but hey, what do i know?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MrPink69 &raquo;</TD></TR><TR><TD CLASS="quote">The reason for my confusion is because i was thinking about the crank. if you were install a heavier crank you would get a lot more torque. So i figured putting some more weight on the crank say like with a heavier flywheel you would get more torque but hey, what do i know?</TD></TR></TABLE>

No, if you were to install a heavier crank, you would NOT get more torque. Installing a crank with a longer stroke will give you more torque however.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MrPink69 &raquo;</TD></TR><TR><TD CLASS="quote">Torque is, (in easy words) the weight spinning( crank, flywheel mainly) and gaing momentum helping to turn your motor. </TD></TR></TABLE>


http://en.wikipedia.org/wiki/Physics

 

ok i dont kow what im talking about because i disagree with you? you START a thread asking why you would want a lightweight flywheel. you get like 10 people telling you why they are better but because its not what you wanted to hear so you argue why heavier is better.

it seems like you already made your mind up so why post? go ahead add some weights you your crank your flywheel your brake rotors even and you can drive a slug of a car.

 

lol ive already done this before and dynoed. I know that more weight is better. My question was WHY LIGHT WEIGHT FLYWHEELS?especially for a 4cyl.I know that more weight is better. BUT obviously you can also have to much. Lets look at it this way. Are you you guys saying that if you could you would completly remove ur flywheel?

Have any of you built a go-cart or anything? try taking the flywheel off a like a 1cyl snowmachine engine. it wont even run because theres not enough turning weight to give the motor momentum to spin. (not saying ur 4cyl honda woodnt run with out one, just an example of the torque from a flywheel)

Have any of you ever been aroung something with huge torque say like a tractor? Have you ever seen how long it takes for one of those engines to wind down? If you looked at the output shaft used to run the attachments it spins for like 25-30 seconds because of the torque.

OR how about a big *** diesel truck. TAKE A WILD GUESS AT WHERE THEY BUILD MOST OF THE TORQUE!!! A BIG *** CRANK. ******* rediculous that none of you would know that. i just lost a little faith in this sight

to the person that said a light turning mass would be good for a road course: i totally agree with that as long as there are no big straight aways and you like runing at very high rpm.

 

your logic is flawed. your this is a dead horse seriously. you really dont understand the difference between inertia and torque. torque is the engine output measured as a force. inertia is simply stored force in the rotating assembly. inertia fights against the motor under acceleration and deceleration. you do want more accerleration dont you?

i also call bs on the dyno. your telling me you personally dynoed the same motor and the only thing you changed was ADDED weight to the flywheel and you gained power?

 

As stated above, you are confusing torque with inertia/momentum.

(An object in motion tends to stay in motion/ an object at rest tends to stay at rest unless acted upon by an outside force)

The outside force is the engine.

The go cart example is rediculous. Of course the engine wont run without a flywheel. You will need the momentum of the flywheel to help carry the crank through the combustion process. If yoiu reduce the weight of the flywheel on that same engine, it will have less inertia to overcome and therefore rev quicker.

Simple laws of physics. You have described them in your last post. You even used the word "momentum" in describing the snow machine engine. And you described the function of momentum in relation to the tractor.

The flywheel doesn't 'create' torque, it stores torque. It is Pk- Potential energy to use another physics term.

You obviously understand most of this. I see your confusion, but a heavier flywheel may arguably help a car get off the line faster, but
it will 'fight' the engines ability to rev therefore slowing the car down over the whole race.

 

You sir need to go back to high school physics. The weight of a rotating assembly has NOTHING to do with the amount of torque it produces. All the weight does is create kinetic energy within the rotating mechanism. Our 800hp sprint cars DO NOT RUN FLYWHEELS. Why? BECAUSE THEY DO NOT NEED THEM. Have you ever lifter a piece of forged steel the size of a tractor crankshaft? They weigh hundreds of pounds sometimes. They take a long time to wind down because it weighs alot to be strong enough to handle the torque of the engine without twisting. Please do some research or go to school for this before you attempt to argue your point.