Lightweight flywheel why

All trac 3sgte engine swap by Nick9 - Oct 30, pm. Jdm 2zz in American celica by Celicaworld - Oct 20, pm. Need advice about where to get replacement heater core please!!! Remix Custom Roof Spoiler? Powered by UBB. Previous Thread. Next Thread. New Reply. Copy Link to Clipboard. Share Post on Facebook. Share Post on Twitter. Share Post on Reddit. A dual-mass flywheel, as the name implies, has two masses connected by springs and bearings, PhoenixFriction explains.

This increases dampening capability, which means smoother shifts and acceleration. Plus, it means less drivetrain and powertrain noise and less wear. The downside is more noise and vibrations as well as potentially more drivetrain wear. Update on the drift car, quick release steering wheel and buckets are in! Clutch kit has arrived, Stage 1 organic with lightweight single-mass flywheel. Plus, if it fails, you have to replace it, rather than resurface it.

As for fitting a lighter conventional engine flywheel, the same pros and cons apply. One exception to the above advice is that if you intend to fit a dog engagement gearbox, you'd be well advised to fit a lightweight flywheel to give the dogs an easier life. Hi All, Many thanks for the advice I really appreciate it.

The car in question is my E28 Mi track car. It has been fully prepared full 8 point weld in cage, brakes uprated, fully adjustable platform suspension etc and now tips the scales at circa kgs. The engine has been left alone, however the clutch is now on the way out, so I thought it best to do the flywheel at the same time I'm unsure as to what the current flywheel weighs, but I'm sure it is heavy!

Given the additional info, does this change anything regarding your answers? Cheers all, DTC. Something that started out life as a big barge with a very big engine would suit a heavy lightening of the flywheel if the engine was in something light, or the car had been stripped On a car with relatively tall gearing, a biggish engine, I see little point in bothering with a lightened flywheel, unless a particular clutch happens to come with one anyway.

Ive never went out of my way to have a lightened flywheel, and probably never will. RT posts months. Flywheel weight doesn't affect torque. It only affects engine inertia. Ok, engine inertia gives you 'torque' off the line through the kinetic energy contained within its mass, but you know what I mean.

BB-Q 1, posts months. There is a bhp increase from lightened internals and flywheel etc. Maximum hp is not affected at all. However, to accelerate a mass requires power. Half that mass and half the power is required to accelerate it. If the power is not used to accelerate that mass where does it go? Melody's weight loss councillor. Yes, the performance improvement is quantifiable and measureable. When you accelerate, the weight of every part of the car resists the power of the engine.

On top of that, all the spinning bits need to be spun round faster, and the polar moment of inertia of all the rotating bits resists this spinning up. You can convert the polar moment of bits like a flywheel into an equivalent weight, and in the lower gears this is a big factor.

Driving 'The Fat One'. Because unless there is a bizarre distribution of mass a lighter flywheel has a lower polar moment of inertia than a heavy one, meaning that it will either speed up or slow down it's rotation more easily. Therefore it gives both better acceleration and engine braking. For exactly the same reason, racing bicycles strive to reduce the mass of their wheel rims and tyres.

Polar moment of ineria is a separate issue from the desire to simply make the machine lighter. When we were building FF engines, the regulations gave a minimum mass for the flywheet and clutch combined.

We used the heaviest clutch we could find so that more material could be machined from the outer edge of the flywheel which is at a greater diameter than the clutch; this way we could meet the regulation mass but keep as much of it as possible concentrated near the centre of the flywheel. This reduces its polar moment of inertia even though the actual mass is the same. If you think that is engineering porn, then just wait 'till you see what Premier Power does to a Sigma flywheel.