Thread: compression VS Squish
02-23-2009, 11:21 AM #1
compression VS Squish
This might help others out too..
I currently have the 3 piece R&D heads on my 1390. here is the question:
my compression is 163-158-155, but my squish is .055. What do I need to do to get my squish tighter without raising my compression?
and, Is it worth it to get my squish tighter? I am running a 2 layer head gasket.
am I good where I am at, or will I see large gains by tightening up the squish?
02-23-2009, 11:26 AM #2
Have the head milled to proper specs.Did you do your squish test from front to back of motor or side to side?
02-23-2009, 11:58 AM #3
- Join Date
- Dec 2007
just got my head back from jim. ustng a new 2 layer gasket do i need to be concerened with squash or can i just bolt it on and what is squash
02-23-2009, 12:08 PM #4
To get your squish any lower you are going to have to cut your cylinders.
Which will raise your compression.
02-23-2009, 12:13 PM #5
Explain this squish stuff to me. I'm confused. I am sending my head to get milled, but not sure what the squish talk is all about.
02-23-2009, 02:27 PM #6
woody PM sent.
squish is the distance from the piston to the head. at TDC
02-23-2009, 02:28 PM #7
02-23-2009, 02:51 PM #8
Here is a good read.
I say leave the tighter squish to the racers. I rode a ski with high compression and tight squish (28 to 30 thou squish) and the torque/throttle response is unbelievable. The fuel/octane requiments are out of the range for a friendly rec ski.
I had a Lowell and Jim cut Oem head at different points and noticed very little difference between the two. I do think the Pro-Tec head ends up with a tighter squish because of the dome shape.
02-23-2009, 05:18 PM #9
my 1300 is .37-.38 thousandths with 165,162,159 lbs
02-23-2009, 10:29 PM #10
I thought squish was that sound ya get when ya step on a cock roach??? I better check into this....
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