RAD VALVES

[dawarriorman]

Found it. First go to this page and then use the browser search for "supersonic".

 

http://www.mototuneusa.com/success_stories.htm

 

It turns out that when you decrease the area of the exhaust port to the point where the flow

exceeds the speed of sound, the amount of energy necessary to clear the cylinder of

exhaust gasses is almost zero !!

 

Then try this page.

 

http://www.mototuneusa.com/super_sonic_nozzle.htm

[FireHead]

Found it. First go to this page and then use the browser search for "supersonic".

 

http://www.mototuneusa.com/success_stories.htm

Then try this page.

 

http://www.mototuneusa.com/super_sonic_nozzle.htm

 

My initial impression is that this guy is a bit of a hippie that has fallen victim to some of the "half sciences" that he speaks out against. I will study it some more, because there is some validity to what he is takling about. Cylinder scavenging via resonant tuning of the exhaust has been around for a very long time. I'll post some more about this when after I have thought about it some more. :baseball_shocked:

[dawarriorman]

Yeah, thats the feeling I got too. He strikes me as one of those conspiracy guys.

 

He's also changed some of it too from when I first read it a few years ago. He used to say that the students were partially right. Can't remember exactly whats different, but he has changed it.

[FireHead]

Yeah, thats the feeling I got too. He strikes me as one of those conspiracy guys.

 

He's also changed some of it too from when I first read it a few years ago. He used to say that the students were partially right. Can't remember exactly whats different, but he has changed it.

 

Here's my problem with what he talks about.............No one who does this kind of thing for aliving uses the terminoligy that he does. " High velocity port," "low velocity port," and "supersonic nozzle," there are no such things. If you going to design a port you are going to design it to flow most efficiently in the range that the engine will be operating the most. You are not going to do the same thing and then try to figure how stall the air flow.

 

The FSAE people he spoke of have an interesting design problem on their hands, they are saddled with a displacement limit and having to pull through a restrictor in the intake tract. Therefore, ports are the easy part of these projects. You can't ever do better than supersonic speed through the restrictor, so that leaves you with getting the most non-overlapping intake pulses possible. He doesn't seem to be able to wrap hism ind around the problem in this case.

 

The other thing to think about, is that the people who are on the leading edge of this technology, rarely commit any of this information to paper outside their company, let alone the internet. Most of the stuff you find on the internet for this type of subject is crap. There is a book that is currently published by the SAE called Ferrari Formula 1, that has alot of information on this type of thing as well as the principle are then applied to an engine scenario. It's a bit of an expensive book, but if you are really into this subject, then you'll love it. :baseball_santa: