Chainsaw Repair

Joe,
In my case, the grooves on the piston, wouldnt it be a shortcut/easier method to fill the syringe with water, top up the grooves to piston top height and read off how many ccs of water is on the piston?
Maybe kerosene instead of water?
Joe (from India) 

very true, good point.  the difference in methods, is mainly in accuracy.  we are talking about maybe 10 to 15 very small drops of liquid = 1cc.

if the top surface of what you will need to find the volume of is flat, it's standard practice to use a glass plate with the method you describe.  "CCing heads."

suggested using clay or silly putty, because it would work for many different kinds of situations where surface is irregular or crowned etc.

liquids leave a depressed cup type of shape on the top surface.  the wider the area is that you will be measuring.... leaves a deeper depression. reason for using clay or glass below.

it all depends on what you are trying to accomplish.

-joe

You are trying to tell me about the inaccuracy in using a liquid because of the surface tension which would not give an accurate level, ok I understand.

Could you tell me what happens if the squish area is increased beyond limits?

...the same thing that happens when squish is set to the bare minimum....just more of it.

the further away the fuel is from the plug, the longer amount of time it takes for the burn.  inefficient.

depends on fuel mix quality, purpose, and load the motor will mainly see in operation.

I agree. Lots of folks over the years have taken the squish down into the teens in an effort to increase compression without realizing the squish velocity is excesssive.

Joe,  what are your thoughts on why saw mfgs  use a flat squish in lieu of tapered squish band?

Adam