squish bands

[drf256]

No need to cut a squish band on an 028 super at all..
It's domed already.

Not true.

Band and piston flat with a small central popup dome. Unlike an 026

 

[jmssaws]

Not true.

Band and piston flat with a small central popup dome. Unlike an 026

Sup doc?
I'm trying to learn about the 026,it's different.

 

[Hedgerow]

Not true.

Band and piston flat with a small central popup dome. Unlike an 026

You sure bout that??

 

[tlandrum]

reverse domes are the best thing going these days,has to be true cause I said it on the interwebs

 

[drf256]

You sure bout that??

Pretty sure for the "Super". Maybe not the standard 028. I could be wrong

 

[tree monkey]

You sure bout that??

if I remember right, there are 3 bores, 2 flat, 1 pop up

 

[bwalker]

This all very interesting. Especially since there are pretty large gains in other two strokes brought about by changes in squish band width and angle.
Two examples would be the Honda CR-500 and older Polaris 700 and 800 twins.

 

[Canadian farm boy]

http://opeforum.com/posts/24736/

I learned this earlier.

 

[tree monkey]

it's been awile since I messed with them

 

[drf256]

SUPER

 

[tree monkey]

This all very interesting. Especially since there are pretty large gains in other two strokes brought about by changes in squish band width and angle.
Two examples would be the Honda CR-500 and older Polaris 700 and 800 twins.

I believe that to be true in larger bores

 

[drf256]

Standard

 

[Brush Ape]

026 I make kind of a pop-up because of the little rim at the top of the squish band. I just trim a narrow band in that areas at the top of the piston. Last one I cut out 0.10 around the top of the piston and lowered the cylinder 0.o7. I ended up with 0.18.

 

[tree monkey]

sooooooooo were we all wrong?

 

[jmssaws]

Only way to know is to cut some on angles and find out.

I tried it and found nothing but somebody else might.

 

[tree monkey]

the last 026 I did I cut .080 off the base

 

[tree monkey]

Only way to know is to cut some on angles and find out.

I tried it and found nothing but somebody else might.

I did too and got nothing

 

[drf256]

the last 026 I did I cut .080 off the base

What???

What piston?

 

[drf256]

026 I make kind of a pop-up because of the little rim at the top of the squish band. I just trim a narrow band in that areas at the top of the piston. Last one I cut out 0.10 around the top of the piston and lowered the cylinder 0.o7. I ended up with 0.18.

Did you cut the narrow band flat, or at Squish angle?

 

[huskihl]

+ 1 on the pop up dome on the supers. I've been into 2 of them that both had them. Don't know about plain 028