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Engine compression

Discussion in 'Trucks and Trailers' started by ArboristSite, Sep 27, 2001.

  1. ArboristSite

    ArboristSite LawnSite Member
    Posts: 65

    Anyone have information on what the compression should be per cylinder on a Dodge 360? I found one used for my plow truck and want to check it out before hand. Thanks, Darin
     
  2. strickdad

    strickdad LawnSite Senior Member
    Posts: 544

    what year engine?
     
  3. ArboristSite

    ArboristSite LawnSite Member
    Posts: 65

  4. thelawnguy

    thelawnguy LawnSite Silver Member
    Posts: 2,412

    Minimum compression 100 psi (engine warm spark plugs removed and wide open throttle)

    Maximum variation per cylinder 40 psi.
     
  5. HOWARD JONES

    HOWARD JONES LawnSite Member
    Posts: 233

    May I ask what the FSM is, and is it online? Many years ago I raced and built my own engines - 40 pound variation sounds absolutely awful, like a real smoker.
     
  6. thelawnguy

    thelawnguy LawnSite Silver Member
    Posts: 2,412

    Factory Service Manual (Chrysler)

    No its not online, its in your garage or local used bookstore :D
     
  7. strickdad

    strickdad LawnSite Senior Member
    Posts: 544

    a compression test is an ok way of telling and engines cond. but a leak down test is alot better. the above post says 100 psi with a maxium spread of 40 psi. i say he is in the ball park , but it should be around 115 to 120 with no more than 20 psi. spread.
     

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