xpensive wrote:Interesting thinking flyn, given that the starter only has to overcome the internal friction?
xpensive wrote:Auxilliary losses should be neglectable in the context flyn, any ideas on F1 starter-power and Rpm?
F1_eng wrote:As has been said, the suggested starter motor method won't really do it. You don't get the same oil pressures and oil film thicknesses as you do during normal running. Both the oil film thicknesses and friction coefficient are included in determining the friction generated by every single component.
Also as said, some components of friction increase with the square of the speed and some don't so you couldn't even attempt to extrapolate the cranking friction up to 18000rpm as you don't know what component of the power loss is dependant on this relationship.
How would I put an image up? I will put up a graph of FMEP for a 1600cc engine through its opperating range for some people to get some idea of frictional power losses, I won't tell you the engine.
If its straight-forward I will put it up if you want xpensive?
If beginning with the squared assumption, if the starter is 1 kW at 1000 Rpm, power-loss at 18k would be 320 kW or 440 Hp, would that be reasonable?
Users browsing this forum: No registered users and 9 guests