This is the difference between a man a boy, right here. A man can admit when he's wrong and take the feedback of other men, and a boy, cannot.

I would say you were correct the first time. "The light flywheels decrease the inertia, so it gives a quick response to acceleration and deceleration. For this reason, light flywheels are used in the sports car. When the clutch disengaged, there is a greater drop of RPM because there is no heavy flywheel to keep the momentum going on. It is not good in normal condition because light flywheels increase the tendency of the engine to die during the gear shifts." www.mecholic.com/2016/12/light-flywheel-vs-heavy-flywheel-effects.html

Good job on you for learning. You’re very punchable in this video.

Its more involved than just inertia, which is just the simplified way of explaining it. It actually has to do with energy (rotational energy (k=1/2(inertia)(velocity), but I will refer to it as linear kinetic to simplify it). As we know from our physics class, kinetic energy(linear) = 1/2(m)(v^2) where m is mass, and v is velocity. The oem flywheel has a greater mass than the lightweight flywheel, so when they have the same velocity, the kinetic energy will be greater. You can also think of it like "momentum". If you have a smart car rolling at, say 20 m/s, it will take a lot less force to speed up to 30 m/s than an F450 accelerating from 20 m/s to 30 m/s. And newton's law F=ma, larger mass will take larger force to achieve same acceleration. I will remember next time that people want more technical explanations which are more complex. So back to the flywheel: - OEM will be faster if you are accelerating from constant velocity in higher gears. - Lightweight will be faster in accelerating from rest. Hopefully this makes sense

No, it makes no sense, because you still have to put energy in to accelerate the heavier flywheel, it's not a steady state, it's accelerating. That extra kinetic energy is stored inside the flywheel, it's not available to accelerate the car with, the energy for that has come from the vehicles engine, so it had less available to accelerate the car. Either way, accelerating the car from a steady state/rpm, the lighter flywheel will accelerate faster. The ONLY time a heavier flywheel will help you accelerate faster, is if you have a vehicle that can't exceed the tyre traction in first gear, and you're setting off from a standstill. In which case you can rev the engine to store energy, and then drop the clutch to use it. The minute the clutch is fully engaged however, the car will accelerate slower from the heavier flywheel. TL:DR - Lighter flywheel faster everywhere, apart from some odd situations accelerating from rest. - I.E. Opposite of what you're saying.

I would agree with Rippthrough. Although Japanda's equations are correct, the way you're using them isn't. You have to take into consideration the change in energy between the two rpm's(4000 and 8000). For example: (I know these are not actual Newtons, but i'm too lazy to do conversions.) at 4000 rpm's: OEM Flywheel: 1/2(16.8)(4000)^2 = 134,400,000 N Lightweight Flywheel: 1/2(11.4)(4000)^2 = 91,200,000 N at 8000 rpm's: OEM Flywheel: 1/2(16.8)(8000)^2 = 537600000 N Lightweight Flywheel: 1/2(11.4)(8000)^2 = 364800000 N So for the OEM flywheel there is a difference of 403,200,000 N between the RPMs. For the lightweight flywheel there is a difference of 273,600,000. Meaning 41% more energy to accelerate the oem flywheel than the lightweight. There has to be a different reason for why your test said otherwise. Also, there shouldn't be much of a difference in acceleration with a change in flywheel. Don't think of your upgrade as an increase in performance. Think of it as an upgrade in your transmission. You are now able to shift faster, because your RPM's will increase/decrease faster. TL:DR -Lightweight flywheel uses less energy -Lightweight flywheel does not make car faster -Lightweight flywheel helps shift faster

What I am saying is that the energy is stored in the flywheel and can be converted into kinetic energy to aid in accelerating in higher gears so the engine doesn't have to work as hard later on in the acceleration because the energy is stored in the flywheel. (also your units should be Joules). I am open to talk on this, because I am still learning.

No, you can't use the stored kinetic energy, because to do so you would have to slow the flywheel down whilst the engine is accelerating. Obviously, that does not happen, what does happen is you store more and more kinetic energy in the flywheel because it's speed is increasing with the engine. The engine is supplying that energy, so that's less energy going to to wheels to accelerate the car.

doesn't it take a couple hundred miles before a new clutch feels right?

The pressure plate pushes the clutch disk onto the flywheel. The flywheel is connected to the engine output shaft. The pressure plate connects to the flywheel, but its an entirely different piece. Watch my full clutch and flywheel install on my channel to get a better idea of what I'm talking about.

No.

there is a tiny bit but its not bad enough to bother me when I am driving it around

He probably didn't reset his trip computer when he filled up.

His test was deeply flawed, the lighter flywheel will NOT reduce your top end performance.

Edward Dergosits the test is wrong. Something else affected his results

My bad I haven't it just seemed very similar to the pulley vid

yeah you are right. 17 year old me had no idea what he was talking about lmao.

I gues this kind of engine need inertia a lot more than conventionnal engine because of short excentric shaft stroke. A lot of people are concluding the same.

>its just a 4 banger

It's a rotary, not a banger...it's a spinner

congrats on finally getting your license