Rotary Valves Make Normal Valves Look Silly - Why Aren't We Using Them?

Takes a lot of space. Whether this will be true for larger engines with larger combustion chambers, I don't really know, just something to keep in mind. The other little drawback I noticed, and this one is from the BSA special, the Ralph Watson car. We can see it. There are traces of combustion around the bottom of the valve, and this is because the

rotary

valve cavity is not sealed against the combustion chamber. We're only sealing the sides of the barrel, so some of the combustion gas, some of the combustion energy, escapes the chamber and enters the little space around the valve.

This is a very small volume, but it is still a small loss of energy and therefore a small loss of efficiency. It's probably a very small loss that is more than made up for by removing the valve springs and camshafts and all that, but again it's something to keep in mind. There is also a small benefit when you think about camshafts and

rotary

valves

. The rotary valve cylinder simply rotates, like a camshaft, and is also driven by a timing belt or chain, like a camshaft, which means we can take a variable valve timing gear and connect it to the cylinder. the rotary valve and obtain variable values. valve timing

using

existing technology very easily.

So, a nice and convenient little benefit. I guess that's all. It is definitely a promising technology, with its small challenges in terms of sealing and the timing for it, it is not ideal, but still, regardless of whether it will happen in the next decade, two or not, it is worth knowing because it serves as Very good demonstration of the shortcomings of the ubiquitous poppet valve. That's all, as always, thank you very much for watching. See you soon with more fun and useful things on the D4A channel.