|| Viv Collins |
| Date :
|| 2002-01-23 15:22:51
| Subject :
|| Re:Mini Myers Initial Tests -- Long Post
Larry Cottrill wrote :
>Viv Collins wrote :
>>Excellent Larry you have done a lot of hard work.
>>May I ask why you did not put the intake chamber on as to me it’s the combination of the chamber and the nozzle that make it viable but you did surprise me with the closed end pulsing I was reading all the way through your posting expecting you to say it would not pulse I nearly fell off my chair at the end:-)
>I just decided at the last minute that an important thing to do was to try to isolate the nozzle as a separate crucial issue -- partly because it just always struck me as the most unconventional part of the scheme, and partly because of my natural sinful rebellion against everybody trying to 'design it' to work. (I am not as ungrateful as I probably made it sound on the other thread!) I did originally intend to build it with the mixing chamber I bought at Wal-Mart for $2.96 US, and I'll certainly still re-work it to use that. I'm not giving up on carburetion, though (but, I do have to admit that the current 'flat venturi' design must be woefully suboptimal).
>It also made it easier to build and set up quickly for a 'first shot' at seeing the principle in action. I think we (at least, I) suffer too often from 'the paralysis of analysis'. As I think I wrote to Bruno once, after you're fifty your problem isn't making up your mind about what you want to do -- it's that you keep being reminded that you're running out of time!
Larry you keep calling the chamber at the front a mixing chamber! Yes, I agree it is one of the things it does but I think it does more than that.
I believe it gives a fixed volume for the nozzle to pressurise and acts in a resonant fashion to aid induction.
We always go on about Kadenacy in relation to the exhaust gasses but think about the induction AF mixture rushing into the combustion tube, what happens to the pressure in the chamber? and when the chamber starts to fill from the inlet hole?
The volume of the chamber its length and the inlet hole size all make me wonder what he needed them for?
As I said before its not just that nozzle you have to worry about its how it interacts with the chamber.
I would be hard pressed to give a coherent answer on why just yet but I do think it very important to the operating cycle.
But the great thing is you went ahead and tested with out it so now when you do add it we will have something to compare against