Has anyone ceramic coated their headers as well as the turbine housing and noticed a performance increase?...I am reading these website and many of them are claiming performance from ceramic coating due to the ceramic material keeping the heat inside the pipe. I will be doing this just to keep underhood temps down a bit, by coating the headers inside and out as well as the turbine housing and if there is a performance increase, its even better.
And the second question I have is relating to the valve flow. I read somewhere that for an NA engine the exhaust valve and port should flow approximately 75 percent as much as the intake side, and for turbo apps, it should flow 80 percent. I drew out a bar graph from some calculated flow numbers done by DR Jones on mk3tech. And he flow benched a stock head and the max the exhaust flowed compared to the intake side was 66.6%, so if the exhaust should be flowing 80 percent the exhaust valves, the port should be enlarged slightly to match the intake flow. Could someone just explain where this 80 percent number came from? The dynamic flows and the physics behind this number, and does this number relate to the valve overlap depending on cam duration at all?
Thanks,
And the second question I have is relating to the valve flow. I read somewhere that for an NA engine the exhaust valve and port should flow approximately 75 percent as much as the intake side, and for turbo apps, it should flow 80 percent. I drew out a bar graph from some calculated flow numbers done by DR Jones on mk3tech. And he flow benched a stock head and the max the exhaust flowed compared to the intake side was 66.6%, so if the exhaust should be flowing 80 percent the exhaust valves, the port should be enlarged slightly to match the intake flow. Could someone just explain where this 80 percent number came from? The dynamic flows and the physics behind this number, and does this number relate to the valve overlap depending on cam duration at all?
Thanks,
