Yep, right on the money. I am aware that the combustion is what actually pushes the rotor. I guess I overlooked that fact when trying to understand how the combustion charge behaves in terms of flow or how it tumbles etc.

For what it's worth, the discussion here has been informative. I admit that these are aspects of rotary combustion I've not considered before so I don't see the discussion as futile.

 

When we were talking about the charge tumbling like a liquid, that was in reference to the charge before it ignites and generates heat.

 

Classic RX8Club, always focusing on the most irrelevant details ....

 

Wasn't really "focused", just a discussion of charge inertia and flame propagation - both of which are highly important to effective octane.
Very relevant.

 

Can we just call the area near the spark plugs; where compression takes place, "Wendy" and move on?

 

No.

Next suggestion.

 

/\ Rastus ?

It's both manly and aggressive .....

 

How about not.

Compression doesn't "take place" at the spark plugs. It starts waaaay before that and continues a bit after. Dynamic compression doesn't even end until 170° of rotation or so.

Lets just call it "compression" and leave it at that.

 

TDC of the compression stroke. The mixture is fully compressed, and ignition has started.

 

...
Back for more?

EDIT - Here, I'll make it easier for you:
What happens first - Maximum static compression or ignition?

 

I feel dumber from some posts

In regards of knock, if I understand correctly: determining factor if engine will knock on given fuel is charge density and temperature after dynamic compression? Of course not considering dilution, homogeneity of charge, timing...

 

I take it you do not agree?

 

my point in posting that statement is that there is a lot of difference of "opinion" out there. Even from recognized experts.
That statement came directly from Paul Yaw. I think he is well recognized and accepted as a pretty good authoritive on the rotary engine?
Personally I agree with that statement, but some people will want too put their own spin on it. Some may not be able to interprete that statement correctly. Some will argue about it, detail after detail-like the worst politician in the world.
.
Everyone can believe whatever they want too. Its none of my business what they believe.

By the way I dont come on this forum to do "battle" so to say I dont choose my battles well is very reflective and I thank you for that.

If people that read this thread want some good factual information about the main topic--then go to Pauls tech papers--he has one on gas/ignition in which he speaks of octane in great detail.

 

ignition! were's mah cookie.

 

There are many people that believe many things that are factually incorrect.
That does not mean they can espouse those beliefs without challenge and I believe it is the responsibility of those that know better to defend the facts so that those factually incorrect beliefs do not get canonized by those that do not know better.

I guess that depends on who you ask. There are some well-placed individuals in the rotary world that depended on Paul's authoritative position and got toasted pretty badly.

 

Is it possible to have maximum static compression on a running engine (ie, requires ignition)?

 

Static compression is mechanical compression.
Dynamic compression builds on and supersedes static compression.

 

lol. Those that know better? Thats another opinion.
People need to educate themselves and in order to do that, an open mind in needed. Some people have more of an open mind than others and some people will learn more than others. Whatever.
I hope that any rotary owner will do a lot of studying, networking, observing, hands on work and then apply their own ideas to their own questions. Hopefully they will share their results with the rest of us.
Unfortunately the best information concerning octane is not on this forum.

 

i suppose thats one view, of course it depends on what your looking for. but just go run an advanced search for posts from me using the word octane. maybe not the best available anywhere on the net but you'll have some pretty damn good info

here's a smattering

https://www.rx8club.com/showthread.p...ne#post2575047

https://www.rx8club.com/showthread.p...ne#post3695509

actually just page one of this very thread should do it. up to about post 25 everything was good.

https://www.rx8club.com/showthread.p...ghlight=octane

these two papers

https://www.rx8club.com/attachment.p...1&d=1311810406

http://www.epa.gov/otaq/presentation...-isaf-no55.pdf

of course stealth's posts are always spot on on the subject

https://www.rx8club.com/showthread.p...ne#post3424016

oh and this post https://www.rx8club.com/showthread.p...ne#post2213002 ill put it here so you can scroll back that thread and read the whole subject and make sure to read the info in Jeff Hartmans book in the link

in fact read that whole thread. its pretty damn good

 

Best explanation of detonation and flame-front propagation:

http://www.motorcycle.com/how-to/wre...tion-3420.html

 

now we are getting somewhere

 

Yeah - twelve years ago.

 

also about 6 years ago and 3 years ago. its just part of the cycle i guess

 

Indeed, though it is frustrating to have those that have been here that long acting as if it hasn't been discussed.

 

you didnt get it did you?
"Now we are getting somewhere" meant that the focus of the thread changed.
it had nothing to do with the subject matter