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  1. #1
    flyboy's Avatar
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    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?

    Thanks
    James


  2. #2
    WATER WOODY's Avatar
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    Have the head milled to proper specs.Did you do your squish test from front to back of motor or side to side?

  3. #3
    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

  4. #4
    mtrager's Avatar
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    To get your squish any lower you are going to have to cut your cylinders.

    Which will raise your compression.

  5. #5
    Mike's GPR's Avatar
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    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.

  6. #6
    flyboy's Avatar
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    woody PM sent.

    squish is the distance from the piston to the head. at TDC

  7. #7
    Mike's GPR's Avatar
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    Quote Originally Posted by flyboy View Post
    woody PM sent.

    squish is the distance from the piston to the head. at TDC
    Thanks

  8. #8
    mrbtd's Avatar
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    Here is a good read.

    http://www.greenhulk.net/forums/show...ghlight=squish

    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.

  9. #9
    One day at a time..... N8R's Avatar
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    my 1300 is .37-.38 thousandths with 165,162,159 lbs

  10. #10
    sleeplessnMS's Avatar
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    I thought squish was that sound ya get when ya step on a cock roach??? I better check into this....

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