I built 4 valve cases from 1mm steel (use stainless if possible), drilled 6 holes per case and welded M4 screws from inside on the cases (it's easier before welding up the cases completely). So they stand like bolts from the cases away. Welding from inside keeps the outer surface nearly untouched, so valves can close completely. [-> see attachement]cbromano wrote:MK-
How did you fasten the spring steel to the valve plate?
The valves are pressed on the cases by the retainer plates, which are fastened with some nuts (here: M4). You see that you will need some kind of retainer anyway. If you just fasten the valves with a screw, the valves would soon getting loose or could even brake near the hole, so it's better or rather necessary to press them along their whole "fastening line" on the cases.
Yes, they do just go to a line parallel to airflow, but without retainers they won't bend! This means that they would simply snap behind the screw (or nut) and brake (experiments at piston engines showed this).cbromano wrote: Also- I am probably wrong but wouldn't the valves not carry enough momentum to go past a line parallel with airflow? I would think the retainers would not be necessary because the valves move a lot less then petal valves.