I certainly can't argu with your pass rallying experience where a heavier flywheel has shown to have its advantages. But we are not building rally cars. These are street cars, and it's well documented that a lighter flywheel frees up the engine's revability and will permit faster acceleration in the first 2 gears.As I recall the argument was being made that the stock unit was lighter but I thought it was RB that said this about the S-10 clutch on the modified stock flywheel being lighter....? I was surprised at the time....
The weight change per se has no benefit unless you want to get weight off of the car. How much benefit is 1 added HP in 2nd gear to the user? (Do the math.) And what disadvantage is it? In rallying an RWD car, a heavy flywheel has some advantages:
So the benefits or detriments should be the focus IMHO, not the weight per se. Light is not superior in all situations.
- It is a damper on the driveline to help prevent a lot of erratic wheel spin as you try to accelerate over a rough, loose surface
- Diving into downhill corners, a heavy flywheel is VERY useful; downshift and dump the clutch just as you throw the car sideways into the corner and the shock to the drivetrain breaks the rear wheels loose very nicely and helps you get the wheels slipping for steering control. Can't do that with a wimpy 10 lb AL flyhwheel....
Anytime rotating mass is removed performance will go up.
My engine reved up MUCH faster on the test stand with the aluminum flywheels vs the stock. Very obvious something changed.
I switched my rear tires on my atv to match my skinny fronts. It shed 20lbs of rotating mass on the rear axle. The atv gained noticible performance and acceleration.
I removed the heavy 3 lbs starter ring gear off my snowmobile primary clutch. The 700 triple 2 stroke now revs up faster then before. Did the same to my brother's 600 triple, same results.
Same applies to crankshaft, and other engine internals, flywheel, and other driveline components, wheel and tire combination etc......
Shed rotating mass = better acceleration...