More dense. How old are you? Also it's not explosion we are looking for, it's combustion. Combustion = controlled expansion, which is something we can harness to perform work. Explosion = uncontrolled expansion, which is something that breaks parts. Detonation is explosion of all or part of the mixture.


whathonda- That's right, it's called quench area (also called squish area). Helps in detonation tolerance, and is definitely important to chamber dynamics.

 

So this design in an NA setup could actually let you run a slightly higher compressing ration? or would the difference even be worth calculatiing?
I suppose the same would be true for FI motors too. letting you run more boost, timing or whever other variables there are in determing detonation resistance. If it's even worth factoing in, what do you think Texan

 

maybe I am blowing this way out of proportion, but what the hell is that supposed to mean????? I hope this was in no way an insult to my intelligence. This your world that I am trying to learn. Step into a field where I possess great knowledge, and I might be asking you the same damn thing.

 

It was a simple question. I haven't met anyone that didn't know what density meant before, so I thought perhaps you were quite a bit younger. Why would I insult you after being patient in explaining something to you?

 

Exaclty,i dont think he meant anything by it.He took the time to repeat what he said to in different ways and was always polite.You my friend are ungrateful.

 

It's not so much an effect that's calculated into chosen c/r, it's just something you try to maximize in any given chamber. There are way too many dynamic things going on in a cylinder for enthusiasts like us to be able to draw simple mathematical conclusions from, but it's safe to say that more quench when possible is always a good thing. This is why DPR always welded up their chambers and made a cloverleaf shape. Also note that in order for quench areas to work properly (quench not only helps mixture homogeny but also helps to cool the piston), the tolerance between the piston at TDC and cylinder head mating surface needs to be very small. If you take KB Piston's advice, they claim the effect loses most of it's anti-knock properties above .06".

 

could you elaborate on that area. I'm not getting the picture.

 

The distance between piston crown and cylinder head. Quench area is where the flat portions of both come very close to one another, forcing air from that area towards the center of the bore and creating strong turbulence (as well as making that portion of the chamber run a bit cooler than the rest).

 

Oh, the diameter on the head is smaller than the bore on the block. Thus, there is a quench area in between.

edit: what's valve relief?



[Modified by Cuong-nutz, 1:56 AM 3/1/2003]

 

That makes sense to make the quench area very short (less than .06")so that the air is forced out with more pressure thus creating more turbulance.
Just to clarify for me, the headgasket is sized to the bore of the cylinder, right. If the edges hung out into the combustion chamber woulden't they actually create hot spots? making that cylinder more prone to knocking? What about filling the chamber like you were talking about texan. Woulden't that create hot spots on the edges since they 'stick out' more. Or are the edges rounded over? I bet you could really raise your compresion ratio by making that clover leaf design. Do poeple do this on B series heads?

 

Ok, so i blew it out of proportion, but you are wrong. I know what density is, I just don't know if you say "more dense" or "less dense" when molecules are closer together. Easily confused, besides science not my thing. HOWEVER, I am very appreciative of Texan's time and patience on this subject. He was a great teacher. By the way, I'm 21. All you had to do was click on my name, and it will tell you. Later. and no harm done.

 

I was thinking about trying that out myself on a spare b16 head I have laying around. I wonder what type of welding to do this; heliarch or what?