Ported 026 Squish Check

[Moparmyway]

.....my peripheral vision is fantastic.

You dont need peripheral vision to read between the lines, but it does come in handy when someone is trying to sneak up on you and kick you in the sack

 

[Mastermind]

You dont need peripheral vision to read between the lines, but it does come in handy when someone is trying to sneak up on you and kick you in the sack

True......very true.

 

[blsnelling]

I was simply suggesting that you're experience may vary from mine since the conditions are different and atypical.

But, since we're on the topic, a proper squishband taper is important. Without it, and without proper squish clearance, combustion is lazy and inefficient. Here's a little technical reading for you guys. Section 4.1 is most relevant to this discussion.

https://www.google.com/url?sa=t&sou...x-ISIaSSR7pXzbNDQ&sig2=Pd_acxfFKndYgaTzEjZwRA

 

[Mastermind]

What taper do you cut the band to?

I ask because I've seen cast squish bands vary wildly.

 

[drf255]

The pic I see shows a band that's angled. but has a piston that's angled as well. At least in the diagram in the article. I guess it does point the squish into the chamber.

 

[jmssaws]

What taper do you cut the band to?

I ask because I've seen cast squish bands vary wildly.

I'm interested in this as well, I use a flat piston and a flat band, seems to work ok.

 

[Mastermind]

If precision is the key to making power, then it would stand to reason that a cast squish band is far from ideal.

 

[jmssaws]

Are we trying to reinvent the wheel? Trying to make it rounder?

 

[Mtthwvn]

Guys I was just curious as to why the squish band would be angled, trying to get anything stirred up wasn't my intention...I just didn't understand the reasoning behind the tapered squish band is all.

 

[jmssaws]

I've always cut them flat but I'm probably wrong, there was that one time I was. Lol

 

[Mastermind]

Guys I was just curious as to why the squish band would be angled, trying to get anything stirred up wasn't my intention...I just didn't understand the reasoning behind the tapered squish band is all.

Why in the world would having a discussion about these things cause anything to be stirred up?

 

[Mastermind]

We all have different ways to do things. Without discussion, how will any of us understand the why in another person's methods?

 

[Stihlofadeal64]

Reading and learnin...
Maw said for me to get more learnin

 

[Mastermind]

I cut the squish flat as a matter of convenience. In the past, I have tried a 1° taper, but could tell no difference, so I went back to zero taper.

 

[Mtthwvn]

Why in the world would having a discussion about these things cause anything to be stirred up?

We all have different ways to do things. Without discussion, how will any of us understand the why in another person's methods?

And I agree 100%, I really enjoy the discussions about things like this. I just wanted to let everyone know I wasn't trying to ruffle anyone's feathers by questioning their method of madness lol

And thanks for the insight on how you cut the squishband. Do you do anything with the Pistons or are they cut a certain way as well?

Matt

 

[jmssaws]

I've never tried a taper, it's easier to cut them flat and they run decent but if a taper made a decent gain is certainly try it.

 

[Mastermind]

And I agree 100%, I really enjoy the discussions about things like this. I just wanted to let everyone know I wasn't trying to ruffle anyone's feathers by questioning their method of madness lol

And thanks for the insight on how you cut the squishband. Do you do anything with the Pistons or are they cut a certain way as well?

Matt

I don't alter the piston on any saw besides the 026. It starts out with a dome, and I cut it flat. I'd tried a bunch of different ways to get consistent compression numbers in the 026, but never could make every saw turn out right where I wanted it.

Treemonkey shared his method, and I tried it....I've been cutting the piston flat every since. Scott was spot on.....

 

[drf255]

I always cut with a taper. But I want it to be flat. My tooling just aint that great.

I need to buy a new lathe and start cutting bands on it.

 

[Trx250r180]

My atv heads had tapered squish and plug in the center of a perfect round dome ,but they ran pipes and longer stroke ,and slide carbs etc.
Had interchangeable domes in a billet head to change compression ratios also ,but they also produced close to 60 hp ,not 5 to 8 like a saw .

 

[jmssaws]

A flat squish with 020 clearance should pretty well have the charge in the combustion chamber I'd think, I don't think "aiming" it there will gain power but I've never tried it.