I have great experience with OS and Nova based engines.

OS maybe has has a slight edge in power, but, usually that power only gets lost in wheelspin for the avarage driver... So there is no point. And they are way way to expensive so i have stopped buying OS branded engines and gone back to Nova. Unless there is high grip and a large track, i get better laptimes with my BTT engines as they are easyer to drive.

Previously i have sold Crono (Novarossi, Recab OS engines and also for a slight momont, Picco). I now sells Nova here in Norway.

In our last Norwegian cup race, i was the only one doing 10 minutes fuelstop in my semi, and only one doing 9minutes in the finale! Only one OS guy made 10 in the other semi, with several OS-engines in semi and A finale. I drove a slightly modified Novarossi Elite 5 engine. I ended 6th in the main.

The Elite 5 is suprisingly easy to drive and very smooth. Has the top end of an OS but use a bit more fuel than OS. OS is 3 times the mony of an Elite 5...