No. The induction valve on the left is a bell valve. The valve on the right is a standard drum valve. If you look carefully at the bell valve, you can see that it has a wide open period of rotation (45*). This happens because the valve is located on the circumference of the back end. The valve is fully balanced, with an opening of (34* ABDC) & a closing of (63* ATDC). Even though the valve's total duration is only 209*, it's time area number is hugh compared to any other type of valve with the same numbers. Numbers such as these make it easy to pipe an engine up! The valve is not affected by the pumping action in the crankcase because it's axial movement is controlled with a ceramic ball bearing. Since the valve is totally balanced it's radial load on the backplate's center bushing is minimal. Notice the circular oil groove which drives any lubricant present towards the center bushing as the valve rotates. No part of the valve's ID touches any part of the back plate's OD, which means that the valve runs without any rubing friction! All parts of the valve are fully hardened!
Jim Allen