Peripheral ports

[Jamie R]

Ok quick question,  maybe Clive can impart some of his knowledge.

So lay in bed thinking about ports (as you do) and wondered if Mazda had ever adopted a power valve system to the exhaust port, similar to what Yamaha did with the YPVS two stroke bikes.

Link below explaining the concept if your unfamiliar ( sorry the guy in the vid is annoying)

https://youtu.be/N-Vc60nQF1A

Just wondered if there is any advantage adjusting the "timing" of the exhaust port thinking this would be simpler to execute on peripheral port than side port on the renesis

So the overlap I hear about can be altered dependant on engine load, rpm, dunno, just my mind overthinking. I don't know enough about the dynamics inside the rotary to understand whether there is a benefit in having an adjustable port.

I'm thinking I apply for a patent just in case Mazda haven't lollll

[clive]

Morning,

OK, I worked my way through the pressure washer ad, then started watching, wow the guy was such a  bad narrator!,  Sadly I  lost the will to live after a few minutes

OK, Lets do simple, just like me.

Yes you can change the port timing to put the power where you want it in the rev range by lifting or lowering the ports roof or base. In very extreme cases the upper or lower portion of the port would be filled. 

Think of it the same way as changing a cam shaft to achieve different  lift and duration on an engine with pistons and valves. 

[Jamie R]

Did Mazda ever mass produce engines with this feature?

[clive]

N/A Mazda Works Race Cars only