what’s to stop teams using a qualifying engine (the one of 3 thats producing most oomphf) then swapping it out in the race for a less powerful unit and saving it for the next quali ?
They have to use the same spec engine for qualifying and the race. They used to be able to adjust engine modes for qualifying or for critical times in a race but that’s not allowed now.
They are allowed three identical engines for the year without penalty. Max is now on his third, so he doesn’t get a penalty for this change. He can change back to used engines, but if he takes another new one, he’ll face penalties.
I think the crack was near a mounting point, obviously crash damage. Whether it can be repaired is not certain at this point. I don’t know the details of the rules, but to me it would seem fair to allow them to do the minimum amount needed to repair the engine. All the mechanical components must be undamaged, it’s just a cracked engine block so repairing or replacing that and refitting all the other bits to it would seem fair seeing as it was crash damage. I’m not sure if the cylinder liners are removable, I suspect not, and not sure how fitting used pistons and rings into a new cylinder block would work.