The total weight of the scavenge and feed oil pump rotors fitted in Formula One V10 engines was previously more than 1 kg, leading to demands for weight savings and friction reductions. A polyethyl ethyl ketone material and a polyimide material have been used to manufacture the scavenge pump outer rotor in a two-stage injection molding process, and a polyethyl ethyl ketone extrusion material has been used to manufacture the feed pump outer rotor. This has resulted in a weight saving of 465 g and a friction reduction of 1.8 kW.
Article of Honda R&D Technical Review F1 Special (The third Era Activities) (269 - 270)