flywheel lightening

does anybody know anything about this specifically? I talked to several shops in my town and they acted like there was no such thing. ("lighten a flywheel? what in the hell would you want to do that for????")

are there any links or anything that i could look at as to what areas can be machined off to lose the weight?

just buy a lightened flywheel......i bought mine like 6 months ago off ebay, and had it machine (just a little to make it even lighter

you got it lightened eh? thats what im talking about. exactly what part do they machine off? One would think that if you made the flywheel thinner, you would have less clutch. am i right on that one?

u are true...but its not too noticable, when they took off the very little they took off on mine they took it off over the whole inside surface exept where it bolts on, it was a lightweight flywheel to began with, so they couldnt safley machine hardly anything off....

91civicDXdude- just curious man- in your sig it says that you have a D16Z6 and are running it with a 90 CRX Si ECU- how does your VTEC engage with that ECU :confused: ...because we know that the D16A6 is non VTEC.

i believe he is using a toggle switch.... i just hooked up my vtec to my nitrous buttons on my steering wheel....its pretty neat, everyone who rides with me thinks i have nitrous, but then are confused when they find no tank.... :-D sooner or later i will get around to buying a rpm activated switch or something.........but for now this is pretty cool

go to www.sofast.com get the phone number form there if they don't have yours listed...thay can either lighten yours or sale you one already lightened...I got one for my gsr engine from there

i just have it wired up to this spring loaded button thing. i just hold it in my shifter hand and hit the vtec when i want it to engage. I just ordered MSD rpm activated switch though so it will be in by tuesday and i'll be rockin the automated VTEC

I like the Vtec engage button on your steering wheel, its like the time i had to Refill the Gass Tank for our B-B-Q and some stupid freasmen at school thought i had NOS!!!! and i was like, YEA, i am gonna go and get it refilled this afternoon, then i am gonna beat 10 second cars, and they were like WOW! :rolleyes:

So what differences have you noticed with the lightened flywheel?


gunnmen01

Originally posted by gunnmen01
So what differences have you noticed with the lightened flywheel?


gunnmen01


Yea, whats the point of having one? other than reducing weight? and how much weight do you save anyways?

a lightened flywheel can free up a couple of extra horses by letting your engine rev faster. the same idea as a lightened crank pully or underdrive pullys. the engine doesn't have to work as hard to rev. it gives your engine less recipricating mass.

by the way, if anyone wants to reply to my thread titled deck hight, please feel free to.

Originally posted by casedogg
by the way, if anyone wants to reply to my thread titled deck hight, please feel free to.

I read that post, but i diddt know anything about the b17, only that it came in the 2nd gen GS-R's............ Thats all, i might even be wrong about it bieng from a 2nd gen GS-R........... :( i'm stooopid......

well, with a lightened underdrive pully, and flywheel i do feel a better takeoff, but thats all, hell our cars can beat most others on takeoff anyway, so there isnt really and real use other than freeing up a FEW more horses, in my opinion its not worth the money or trouble of installing it

everylittle bit helps when your trying to squeeze every last hp out of an all motor engine

Compare a hf flywheel to a si flywheel you will find that the hf is about 2lbs lighter. and it will fit I have one on mine. "cheap mods" basiclly they take out the area around the bolts. But if ya got lighter you will lose some tourqe just so ya know. I wont go into the phyicis of it but rotating mass, the more weight ya have moving the the more it takes to slow it down. Do you understand I just confused myself. lol

good point. i just happen to have a CRX HF lying around that i've been meaning to steal the clutch and pressure plate off of, might as well make it a package deal and grab the flywheel while im at it :D

i'm also in the process of lightening the flywheel on my '00 civic (d16y8 i think... it's sohc vtec [correct me]). i already asked around and they say that i should only take off 1kilo from it because I have a heavy car. is that true? did a little research and they said that it would be best to try to take the weight from the outer part of the flywheel. it's physics basically. they also said that you'd lose 3rd gear onwards if you shed too much wieight.

i don't really get some parts of it though like the loss of mass therefore torque to turn the wheels because you didn't exact change the circumference of the flywheel, ergo, no change in ratio in engine rotation and drivetrain. therefore your wheels should turn in much the same way in proportion to the engine... the same speed. lightening the fly relieves the engine of some weight, allowing it be able to turn the fly much easier. so in my mind, there shouldn't be any problem. right? except that of the idling because of lessening the momentum between combustion strokes.

i'm thinking that you'd lose something as regards to the relationship of the fly and the clutch. since your engine would be turning the fly much easier, faster, the clutch will most probably slip more during engagement. maybe that's how you lose torque.

more information please!!!

A heavier flywheel will lose less momentum when the clutch engages, because it has more energy from the weight and mass it carries.

i have a 9.75 lbs. fly wheel it works just fine.

A lighter flywheel will spin up faster and cause less drag on the engine when accelerating..

91civicDXdude- just curious man- in your sig it says that you have a D16Z6 and are running it with a 90 CRX Si ECU- how does your VTEC engage with that ECU :confused: ...because we know that the D16A6 is non VTEC.

they also chip are pm6 ecu's to work with vtec in a/c memory...thats if you dont have a/c in your car anymore like mine....I know a guy who does it an hour away from me from Honda-Tech

an aluminum crank, rods, pistons and a lightweight flywheel would get you increased throttle response because there is less mass to get moving. Wouldn't be bad for a NA car, but forget it turbo.

the way i see it is if you can make your car lighter you should do it. especialy if you can do it without cutting up your body supports. get me? it can only help. i have actually heard somone saying if you make your flywheel to light you can do damage or somthing but could have been stupid people. idk. but dont say it like "whats the point of lightening your flywheel? it only makes the car lighter" i mean yeah if you arent going all out this probly ain the upgrade for you but its i good one if you are planning on replacing your clutch soon.

the way i see it is if you can make your car lighter you should do it.

The idea isn't to get the car lighter, if you were that obsessed with car weight, take out all the bolts and replace them with aluminum bolts. What a lightened flywheel is all about is essentially increasing your RPM response time from idle to redline. If you could hit Vtec sooner, you would be faster. If the engine doesn't have so much weight in the rotation to get moving, it can get to higher RPM's sooner.

ok now i see. thanks for that response. i think i dident actually read this before i posted. i thought i posted a long time ago and read it just now and i was toward the end of it. oh well. good info here

The idea isn't to get the car lighter, if you were that obsessed with car weight, take out all the bolts and replace them with aluminum bolts. What a lightened flywheel is all about is essentially increasing your RPM response time from idle to redline. If you could hit Vtec sooner, you would be faster. If the engine doesn't have so much weight in the rotation to get moving, it can get to higher RPM's sooner.
yes but if you get too light of a flywheel than it will be bad.i think anything under 8 lbs (because that's what a spoon is) is TOO light.