Fruity, I partially disagree. As I said in another post, it's only the first part of an incline in which a heavier flyweel (rotating mass in general) is of some assistance.Lightened flywheels are known to have a negative effect for going uphill, or at least such a steep hill that engine speed will reduce.
Yes. If the car were to start the climb from a standstill at the bottom of the hill, with a lesser flywheel effect (lesser rotational inertia from any source) the car would accelerate from rest all the way to the top of the hill with somewhat greater alacrity, than it would with a greater rotational engine mass.However, it will still accelerate slightly better going uphill.
This is an interesting thought. It has crossed my mind before that at least theoretically there must be some degree of gyropscopic action (associated primarily with rotational engine mass, but also gears and wheels etc.) that would assist the car to change direction when steering one way, but hinder it when steering the other way. I can't say that I've ever felt a difference that I could attribute to such an effect. I'm fairly sure such an effect exists, just not at all sure what magnitude it might have. I assume it would be different for engines mounted east/west than it would be for engines mounted north/south.A side effect of a lightened flywheel is less large-diameter gyroscopic mass. I'm not going to try to explain about that so just accept that reduced gyroscopic mass helps the car turn easier when travelling at speed.
If anyone doubts the existence of this effect, take a bicycle wheel and hold it in front of you with both hands (by the axle) at arms' length, have some rotate it fast, and then 'steer' it to the right, then 'steer' it to the left. You'll feel the gyroscopic affect, quite different left vs right. The wheel will 'steer' easily one way, and be quite resistant 'steered' the other way (can't remember which way is what, years since I did this experiment). The wheel will also try to rise higher when 'steered' one way, and try to drop lower 'steered' the other way.
Agreed. I don't know what the equivalence ratio is (differs at diferent rpm I'm sure), but it is quite significantly harder to get a rotating mass to move forward than an equivalent mass that is not rotating. Gyroscopes don't 'like' to move, other than rotationally.I'm sure I read that removing around 5kg of flywheel mass is equivalent to removing 100kg of chassis mass. On a TS a lightened flywheel feels like less than a 50kg weight loss to me.
The improvement in engine response is probably the main gain.