While cruising through recent patent applications I came across this design for a new poppet valve from Michael Czysz, designer / builder of the MotoCzysz. It’s pretty interesting. Instead of the usual circular valve we’re all familiar with, this design is triangular but not straight edged, it’s the shape you would get if you took sections of the circle and folded them over inward. The end result is roughly the same perimeter as the circular valve but in a triangular shape.
What’s the benefit? Well, for one it’s lighter. There’s less material since you have removed some of the central mass of the valve. Second, you can fit more valves in a given head area since the fingers can overlap in what would have been the circumference area of neighboring valves. Third, they will actually cool better since the perimeter contact area is the same but there is less mass to cool.
How well will this actually work? I have no idea since this is definitely outside my areas of expertise but from the descriptions given, it makes a lot of sense. Once you get past the odd appearance, the idea seems very neat.
Has this been tried in an engine already? That’s something we’ll have to find out but it shows Michael Czysz isn’t afraid to think outside the box.
More drawings below: