I do purge nitrous threw my engine its just part of my routine. I purge to the atmospere get to around 975 psi hit the bang button 2-3 times purge down to 950 then stage. The other weekend a racer I know was telling me he stopped purging threw his engine and thats when he stopped hurting pistons. Im only on a .030 jet and he sprays alot more than me, is there something to this? should I stop purging threw the engine? Anyone elnse have results like this guy? I havent hurt anything on my engine yet and dont want to if I can avoid it, just wanting some of everyones input. thanks mike.