My motor has about 4.5litres on it now and it still has a bit of mechanical pinch, OS must have changed something in the last couple of years since i last ran an OS as they use to lose their pinch in the first 2 litres.
Coming from the Reds engines, the OS is a monster, not quite as controllable but the brute force is fun to drive. I've tamed it down with a 6mm restrictor so it's much easier to drive now. I've got some nitro mizers aswell to try so it'll be interesting to see the run time i can get as with the Reds i could manage 11:30 quite easily track to track.