detonation/ squish band

[gb blaster]

So i was reading the fourm "Closing up the squish band clearance on my modified head! My testing continues...." an i dont understand it because i dont know what detonation/ sqush bads is.

I did some research with the search but im still a little confussed about it..

Will some one explain what the 2 are an what they do to the engine?

 

[gb blaster]

Dam no ones willing to explain it a bit for me?

 

[mk2dubbin]

Squish band generally refers to the distance between the top of the piston and the bottom of the dome toward the outer circumference of the piston. The squish band helps to force the air/fuel charge inward toward the center of the piston toward the spark plug. Generally speaking - too little squish (more distance) yields less than optimal power, and too much squish (less distance) traps air and fuel in that area and helps to contribute to higher temps and wear on the cylinder.

This is a very brief and simplified description. You should be able to do a quick search for both squish band and detonation online and read for hours!

 

[best]

Dam no ones willing to explain it a bit for me?

Hey dude, you waited 1hr45min for an answer?
Real education comes harder than that.
You have some real bright guys on here who you should be honoured they waste their time with you.

Detonation is overly rapid combustion.
The burn does not progress smoothly with a push on the piston,
instead due to temperatures, pressures and mixture it burns suddenly with the force of a hammer.

Squish band is outside area of the cylinder combustion chamber that cools and squeezes the air/fuel mixture as the piston comes up to Top Dead Center (TDC). It "squishes" or squirts the air/fuel mixture into the center of the combustion chamber, keeping it mixed and active, avoiding detonation. It also cools or "quenches" the end gasses around the outside diameter and keeps them from detonation, so it is also often called "quench band".

 

[gb blaster]

Hey dude, you waited 1hr45min for an answer?
Real education comes harder than that.
You have some real bright guys on here who you should be honoured they waste their time with you.


Uhmm... hey dude... i am always greatfull an honored for the time people spend helping me... i always say thatnks i just wanted an answer so could contune reading the other fourm so i posted a replie in there for it to be the number on title that shows....


BUt thanks for the information im glade you could help...

 

[dksix]

SCD also has a thread on it.
http://www.blasterforum.com/engine-13/squish-mystery-not-47719/
I think I asked allot of questions in it, as I also didn't understand it. If you are really wanting to understand modding and tuning 2 strokes you should check out Two Stroke Tuners Handbook By: Gordon Jennings . Basically it's the foundation of modern 2 stroke building, old but definitely not out dated. I found it as a PDF, I might be able to email it to you if you can't find it for download.

 

[gb blaster]

thanks i would love the email an ima read that thread now i wonder why my sear didnt return that one

 

[sicivicdude]

Good lord, it's even a sticky at the top of this section.

Literally like 7 posts above above this one currently!

http://www.blasterforum.com/engine-13/squish-mystery-not-47719/

Detonation is nearly what best said Detonation is a rapid conflagration

Detonation - Wikipedia, the free encyclopedia

Pre-detonation is what best described (and what you're talking about in relation to an engine). It specifically relates to an unintended explosion that occurs while the piston is still travelling upwards which "hammers" the rotating mass.

Edit: dksix beat me to it

 

[gb blaster]

i no i used the search tool for detonation only may have had better luck if i did sqush band two

 

[best]

Good lord, it's even a sticky at the top of this section.

Literally like 7 posts above above this one currently!

http://www.blasterforum.com/engine-13/squish-mystery-not-47719/

Detonation is nearly what best said Detonation is a rapid conflagration

Detonation - Wikipedia, the free encyclopedia

Pre-detonation is what best described (and what you're talking about in relation to an engine). It specifically relates to an unintended explosion that occurs while the piston is still travelling upwards which "hammers" the rotating mass.

Edit: dksix beat me to it

I dumbed it down... Is that OK?
I can get really pedantic at times, but I guess you have noticed?
James, keep posting, I enjoy it.

Steve

 

[sicivicdude]

Steve, I just like being specific. Not trying to call you out man! I:I

Detonation is really good stuff when it's timed right, afterall that's what we're after isn't it? Pre-detonation is REALLYYYYY REALLLLLLYYYYYYY bad stuff and will tear an engine to pieces in a hurry. Short of pouring sand directly into an engine I can't think of a better way to completely destroy a motor...