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  1. #1
    rhyne717xp's Avatar
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    What kind of solder to use checking squish measurement?

    I was wondering what kind of solder to use checking squish measurement. The manual says not to use acid core type. I am more concerned of what size? I would assume it would have to be fairly thick in gauge but not too thick. What is the best thickness?

    Thanks in advance
    Randy


  2. #2
    SURFnTURF's Avatar
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    2.5 mm is about what you need.Make sure you get it right out at the edge of the bore

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    1/8 inch thick or something close to that. 50/50 tin/lead. You might need to find a welding supply shop to get solder with lead in it.

  4. #4
    rhyne717xp's Avatar
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    Cool, thanks guys. Im gonna try to find some locally.

  5. #5
    rhyne717xp's Avatar
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    Quote Originally Posted by SURFnTURF View Post
    2.5 mm is about what you need.Make sure you get it right out at the edge of the bore
    I have a piston laying around that i could use to estimate where the edge of the bore will be. Gonna test out my new digital caliper

  6. #6
    SURFnTURF's Avatar
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    You need to measure the outside edge directly over the Gudgeon pin front and back for both bores. Get all your measurements and average them out for each bore.

  7. #7
    rhyne717xp's Avatar
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    Quote Originally Posted by SURFnTURF View Post
    You need to measure the outside edge directly over the Gudgeon pin front and back for both bores. Get all your measurements and average them out for each bore.
    Thanks man, I did do that parrellel with the wrist pins front and back. I didn't average them because at first I had the same readings at first 1.34 mm on all. I did another squish measurement about an hour after I had started the engine for a few seconds. I got a lower reading of 1.22 mm. I plan on doing another squish test over the weekend. 1.22 makes more since bc i am getting 170-175 psi cold engine compression with a R&D rec high compression head "designed to run on pump (93) octane".

  8. #8
    rhyne717xp's Avatar
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    1.34 pto 1.39 mag squish in mm average

  9. #9
    SURFnTURF's Avatar
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    Too small you need 1.8 mm minimum for it to not suffer from detonation or squeak a piston/ring.
    You need to do a relieve cut on the domes or run a thicker base gasket.
    I have never done it with an [email protected] Head but you might be able to run the stock head gasket with this head so you get min 1.8mm
    This way you dont have to pull the cylinder off to change gasket or machine the domes.

  10. #10
    rhyne717xp's Avatar
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    Quote Originally Posted by SURFnTURF View Post
    Too small you need 1.8 mm minimum for it to not suffer from detonation or squeak a piston/ring.
    You need to do a relieve cut on the domes or run a thicker base gasket.
    I have never done it with an [email protected] Head but you might be able to run the stock head gasket with this head so you get min 1.8mm
    This way you dont have to pull the cylinder off to change gasket or machine the domes.
    The factory squish is 1.3-1.7mm on a stock head on 87 octane for a 787. I added a R&D head to up the compression. Which tightens the squish a little. I plan on running higher octane. Do you think I should run a 50/50 mix of race fuel?

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