Originally Posted by
B16CVH
A few flywheel quotes:
"I had one in my old Cav V6. the most noticable thing I found was lower fuel economy on long runs. The thristy V6 round town was capable of high 35-40mpg on a run. This dropped to 30-35mpg after having the flywheel lightened as the stored energy in the mass of the wheel wasnt turning the engine "for free". Round town I didnt notice any improvement except in the drivabilty, much easier to get going and a much nicer driver."
https://passionford.com/forum/showthread.php?p=3392763
I've not seen any evidence in this thread, any of the quotes or that other PF link that a lightened flywheel affects the amount of Torque an engine produces, as per your earlier reply.
It's a bit arse-about-face in my logical eyes. Torque is produced BEFORE the flywheel and if anything, the flywheel being lighter will help the engine be more efficient.
Agreed that you have to know what you are doing and going too light will have nasty side-effects. Also, whether or not you notice the difference may be questionable too, but that's no different to many other mods (like knife-edging cranks etc).
My 1600CVH makes 300lb/ft with the lightened Flywheel on it. I've had that fitted since around 2004, so any results the car has achieved have been with it. How many other 1600 CVH Turbo's have done 300lb/ft?