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  1. #1
    rpa101's Avatar
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    Matrix port timing

    If someone has a matrix cylinder off and has some time can they measure the ports from the top of cylinder to port open and close
    thanks


  2. #2
    Click avatar for tech links/info K447's Avatar
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    Quote Originally Posted by rpa101 View Post
    If someone has a matrix cylinder off and has some time can they measure the ports from the top of cylinder to port open and close
    thanks
    There are several variations of the 'Matrix' engine configuration. Some still have a second base gasket (as part of the original 'factory' conversion) under each cylinder to raise the port timing. During rebuild sometimes the second base gasket was omitted, thereby lowering port timing and raising compression.

    Some Matrix engines have a special cylinder head that sits down inside the top of the cylinder slightly to bring compression up and compensate for the taller cylinder caused by the doubled base gaskets. If this lowered head is used without the second base gasket the squish zone becomes near zero, which did damage some engines that were rebuilt without the second base gasket and squish was not checked.

    Some have had porting done to change from the standard MSX 140 cylinder that was used on the 'stock' Matrix.

    Some have had the cylinders shaved shorter to compensate for the double base gasket and raise compression.

    Essentially each still existing Matrix has its own story. They were built in several batches or 'series' but there are differences, especially now that they have been around long enough to need rebuilding and performance tuning has occurred.

  3. #3
    rpa101's Avatar
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    Yes k447 you are correct from my research their was some matrix motors that the port timing was corrected to use one gasket
    I am getting some sleeves made for my 800ves cylinders I'm going to use on my 1200 project so I need to compare 140s to a matrix or if I can get someone to measure a 140s from the top down I can get an idea on we're to go with this

  4. #4
    Click avatar for tech links/info K447's Avatar
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    Quote Originally Posted by rpa101 View Post
    Yes k447 you are correct from my research their was some matrix motors that the port timing was corrected to use one gasket
    I am getting some sleeves made for my 800ves cylinders I'm going to use on my 1200 project so I need to compare 140s to a matrix or if I can get someone to measure a 140s from the top down I can get an idea on we're to go with this
    I probably have some old MSX 140 cylinders around here I can measure. Or you can come by and pick one up

  5. #5
    rpa101's Avatar
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    Thanks k447 if you could measure it for me would be great your a 6hr round trip for me and my wife is limiting road trips apparently I pick up to much stuff on them lol

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    Matrix porting

    This is a very interesting 3head,mine wich came stock from polaris
    has n.3 polaris metal gasket under the cylinder,these are stock msx140's jug,150 psi compression 0'06-0,055" squish

  7. #7
    Click avatar for tech links/info K447's Avatar
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    Quote Originally Posted by rpa101 View Post
    Thanks k447 if you could measure it for me would be great your a 6hr round trip for me and my wife is limiting road trips apparently I pick up to much stuff on them lol
    I won't have access to the MSX 140 cylinders until middle of next week.

    If I forget to report back please remind me

  8. #8
    rpa101's Avatar
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    Quote Originally Posted by modesto View Post
    This is a very interesting 3head,mine wich came stock from polaris
    has n.3 polaris metal gasket under the cylinder,these are stock msx140's jug,150 psi compression 0'06-0,055" squish
    You wouldn't know how thick the shim stack was ? With gasket ?
    Really im not 100% sure the cylinder resign was not for lowering comp. to reduce heat and detonation ? I'm sure the increased port timing helped with the pipes ?
    Thanks k447 that would be awesome

  9. #9

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    Quote Originally Posted by rpa101 View Post
    Quote Originally Posted by modesto View Post
    This is a very interesting 3head,mine wich came stock from polaris
    has n.3 polaris metal gasket under the cylinder,these are stock msx140's jug,150 psi compression 0'06-0,055" squish
    You wouldn't know how thick the shim stack was ? With gasket ?
    Really im not 100% sure the cylinder resign was not for lowering comp. to reduce heat and detonation ? I'm sure the increased port timing helped with the pipes ?
    Thanks k447 that would be awesome
    Are you ask me for the all thickness of raising up ?
    around 1 mm due to the fact i measured the gasket 0,35 mm each

  10. #10
    rpa101's Avatar
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    Quote Originally Posted by modesto View Post
    Quote Originally Posted by rpa101 View Post
    Quote Originally Posted by modesto View Post
    This is a very interesting 3head,mine wich came stock from polaris
    has n.3 polaris metal gasket under the cylinder,these are stock msx140's jug,150 psi compression 0'06-0,055" squish
    You wouldn't know how thick the shim stack was ? With gasket ?
    Really im not 100% sure the cylinder resign was not for lowering comp. to reduce heat and detonation ? I'm sure the increased port timing helped with the pipes ?
    Thanks k447 that would be awesome
    Are you ask me for the all thickness of raising up ?
    around 1 mm due to the fact i measured the gasket 0,35 mm each
    Yes and thanks for your help

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