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Head Gasket

Discussion in '1982-Present GM Diesel' started by Blazr77400, Sep 14, 2001.

  1. Blazr77400

    Blazr77400 1/2 ton status

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    Has anyone ever thought of using a Thicker head gasket to lower the compression a bit so adding a turbo wont hurt it as much. I think 19:1 is the ideal compression for the turboed 6.2 isn't it?
     
  2. josephn

    josephn 1/2 ton status

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    Never thought about it but that sounds like it might work.
    Anyone else have any thoughts?

    1982 6.2L Diesel K5 Blazer, TH700, 31 inch tires.
    Fire ALWAYS makes it better.
     
  3. BlueBlazer

    BlueBlazer 1/2 ton status

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    No, it wont work. First of all, youd need a very thick gasket which would be too thick to seal effectively. Secondly, diesels have their combustion chamber in the piston, not in the head like gas motors. So moving the head away from the block would have almost no effect on ratio.

    82 K5, 6.2L Diesel, sm465, np205, 14 bolt welded, 8 lug 10 bolt lock right, 410 gears, 35" Mud Kings
    SPEAK SOFTLY AND DRIVE A BIG TRUCK
     
  4. Blazr77400

    Blazr77400 1/2 ton status

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    I dont understand what you mean, The combustion chamber is in the Piston not the Head.
    The thickness of the gasket wouldnt have to me much because of the already high compression ratio. I think the 6.2's are built a little different, they have a little different combustion process as opposed to other diesel, I dont know. Maybe its just the injection thats different.
     
  5. BlueBlazer

    BlueBlazer 1/2 ton status

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    First of all, you really have to see the insides of a diesel to know what Im talking about. Basically, the head surface is flat as opposed to a gas motor in which the combustion chamber is recessed in the head. Instead, the piston itself has a bowl shaped cast into it where the fuel is sprayed and ignited. Since this is the space that the air is compressed into, moving the head away from the piston would do little to lower compression.

    82 K5, 6.2L Diesel, sm465, np205, 14 bolt welded, 8 lug 10 bolt lock right, 410 gears, 35" Mud Kings
    SPEAK SOFTLY AND DRIVE A BIG TRUCK
     
  6. josephn

    josephn 1/2 ton status

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    So instead of using a thicker head gasket you would have to have the bowl in the pistons cut deeper right?

    1982 6.2L Diesel K5 Blazer, TH700, 31 inch tires.
    Fire ALWAYS makes it better.
     
  7. BlueBlazer

    BlueBlazer 1/2 ton status

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    Well yes and no. You wouldnt cut the old ones. There are a few companies (peninsular diesel, etc.) that make the pistons with a bigger bowl that make either 19:1 or 18:1 compression. Very pricey and are really only needed with insane amounts of boost.

    82 K5, 6.2L Diesel, sm465, np205, 14 bolt welded, 8 lug 10 bolt lock right, 410 gears, 35" Mud Kings
    SPEAK SOFTLY AND DRIVE A BIG TRUCK
     

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