over the past year in our cylinder head program we have been trying different valve seat angles and the effect they have on airflow and port velocity. in fact i am working with William Dennish on an article on these different valve seat profiles. we have designed 30-50 degree contact angles. 30 flow well at low lifts and 50 degrees work well at the higher lifts. an interesting design are cvo,and screaming eagle heads from Harley. they have a raised 45 degree seat. in the past we used to cut in our own angle be over with it. it comes to fact these are a very good seat set up. the problem you have to CNC machine to machine these seat profiles. in the past year and half we purchased a NEWEN CNC machine to design and cut these valve seat profiles. in the past month i have put alot a development in these raised seat designs. i have changed the valve contact angle to 50 degree and the approach angle to the seat is now 82 degree. Harley uses a 90 degree approach. we have seen the air flow pick up from .50 lift-.600 lift. i also want to note for the past year or so all my heads have 50 degree seats with no issues, there is myth these seat are short lived is just that a myth. i have to get work, thanks charlie
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Topic: valve seat angles (Read 1201 times)