Author Topic: Measuring Squish  (Read 109 times)

0 Members and 0 Guests are viewing this topic.

Offline KilliansRedLeo

  • Nitro Hotsaw
  • *******
  • Posts: 2361
  • Karma: 80
  • Location: Rochester, NY
    • RoCHusqvarna
Measuring Squish
« on: January 02, 2014, 06:53:47 pm »
I am doing a post on the modification of a 261 Husqvarna. I want the reader to measure squish prior to taking the saw apart. If you measure squish without cleaning any accumulated carbon off the piston you will get a less that accurate measurement of the squish. Normally this is done with new/clean pistons, so I know it will not be 100% accurate, I just need a ballpark measurement. Should I just forget this stop or can I add/subtract some nominal factor from the squish measurement to partially account for the carbon? What is your experience?
"When the people fear the government...you have tyranny....When the government fears the people....you have liberty"

Thomas Jefferson
1743-1826

Share on Facebook Share on Twitter


Offline mdavlee .

  • Global Moderator
  • Nitro Hotsaw
  • *******
  • Posts: 1968
  • Karma: 171
Re: Measuring Squish
« Reply #1 on: January 02, 2014, 07:34:24 pm »
 I don't usually bother with carbon removal if there's some there. It's usually not thicker than .002-.003" at the most.

Offline KilliansRedLeo

  • Nitro Hotsaw
  • *******
  • Posts: 2361
  • Karma: 80
  • Location: Rochester, NY
    • RoCHusqvarna
Re: Measuring Squish
« Reply #2 on: January 02, 2014, 07:43:41 pm »
I don't usually bother with carbon removal if there's some there. It's usually not thicker than .002-.003" at the most.

Cooooooool, just what I needed to know. So if they measure 0.035 squish they can add 0.002 to 0.003 to that and get 0.037 to 0.038!


"When the people fear the government...you have tyranny....When the government fears the people....you have liberty"

Thomas Jefferson
1743-1826

Offline 660magnum

  • Global Moderator
  • Nitro Hotsaw
  • *******
  • Posts: 6437
  • Karma: 249
  • For The Love Of Chainsaws
  • Location: NCO
Re: Measuring Squish
« Reply #3 on: January 02, 2014, 07:47:28 pm »
I always considered that the soft carbon got mashed down and some of it got embedded into the solder etc. That it wasn't enough to bother with and when you run the engine, the carbon will return.
We should share what we know... someone may learn...
That knowledge can live after us... and that "Pays It Forward".
Be all that you can be . . .

Offline Al Smith

  • Moderator
  • Nitro Hotsaw
  • *******
  • Posts: 2753
  • Karma: 170
Re: Measuring Squish
« Reply #4 on: January 02, 2014, 07:51:46 pm »
I lift the cylinder ,remove the rings and clean everything up first .Then half the time miss cutting and have to fumble around and make a different gasket .Not a big deal if you don't cut enough .You can always recut it .Kinda tough to put it back on though if you cut too much .

 

Related Topics

  Subject / Started by Replies Last post
Squish

Started by joe_indi Stihl

9 Replies
2482 Views
Last post August 12, 2012, 03:55:31 pm
by Al Smith
6 Replies
315 Views
Last post September 28, 2014, 04:01:36 pm
by farmboy
17 Replies
222 Views
Last post January 22, 2014, 11:37:54 pm
by aclarke
9 Replies
346 Views
Last post December 15, 2014, 05:11:31 pm
by 1manband
1 Replies
164 Views
Last post January 02, 2016, 09:58:46 am
by weimedog