i love this kind of convercations.
Just to say, TZ is very good motor, but I saw it last weekend at CP and on end of stright way it was only 34000 RPM, NS12 was 36000, Rex RER 36000.
And what most important is that all of them had different speped.
OS is very old established company, which very well know to produce most reliable engines. also it is not secret that they keep 70% market of nitro engines. But most of those years OS was targeting reliability and performance wasn't main target. TR and now TZ seems like their very good debuts, but still behind brands like Novarossi and Sirio in power side. BTW I saw piston blew up on TZ in powder.
All Novarossi engines are very similar (13.76X14.04), but all of them have some difference-induction timing, ports capacity, case volume etc. Some numbers is very close but still of from each other. I don't care what web site sad about part ####, I mesure them, cut on small pcs, mesured weight of everything, put on balancing stand to check static and dynamic balancing etc.
They are different!!!!!!!!
Whatever you guys have on your car, just make sure you use all 100% power this engine can produce.
Edward