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Piston To Valve Clearance

Discussion in 'Engine Building' started by BIGGERS, May 18, 2003.

  1. BIGGERS

    BIGGERS Junior Member

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    how do you engage the vtec to check piston to valve clearance on a ls/vtec?
     
  2. lsvtec

    lsvtec GNU/Linux Evangelist

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    The only way I know of is to use air pressure to lock the VTEC followers.
     
  3. no2psi

    no2psi Senior Member

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    Here is what I did. I rolled the engine on the small lobes, and measured what type of clearance I had.
    Then measured each of the small lobes with a caliper. Get the biggest measurment you can. (Overall diameter)
    Then get the small measurment of the same lobe.(Heel Diameter) Take the Overall diameter - Heel diameter=(net cam lift) Take your net cam lift mulitplied by your Rocker arm ratio (In your case 1.5) This equals your valve lift.
    Now do the same thing with your BIG lobes, exept use a rocker arm ratio of 1.58 for VTEC Rocker arms. Add the difference to the your indentation and you will know if you have contact. Take into consideration rod stretch too. Something like .035"
    It sounds complicated, but isnt really.
     
  4. B16

    B16 Super Moderator VIP

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  5. lsvtec

    lsvtec GNU/Linux Evangelist

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    That is a great idea, I wish I had found that when building my engine.
     
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