"I've had a broken crank with an RB engine in the past, and other friends had them on other Nova based engines, and that doesn't mean Novarossi has bad quality. In most cases we've concluded in it beeing because of a bad tuned engine(overheated) or bad quality fuel." end of quote


I agree 100% with you AFM. We have to remember also that there will always be many factor involving these kind of problems in an engine ranging from user's mistakes, productions flaws etc... I have venture again in using Sirio engines, after almost 8 years using, almost exclusively, Nova Rossi based engines (Top, REX, J.P's) I have found out that given the price of a Sirio you are getting in return a good "all around engine". It is a relieve for me not to expend 250.00 plus on engines every year.

I personally race a Collari/Sirio engine on my Sedan. Now I am planning on buying an EVO Sirio for my club races.