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Leak down test results

Discussion in 'Engine Building' started by ohmstable, May 22, 2004.

  1. ohmstable

    ohmstable Senior Member

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    I just did a leakdown test on my DOHC ZC and here are the results

    Cyl #1 - 27% leakage ; mostly from exhaust valves
    Cyl #2 - 20% leakage ; mostly from exhaust valves
    Cyl #3 - 50% leakage ; mostly from exhaust valves
    Cyl #4 - 25% leakage ; mostly from exhaust valves

    These numbers seem pretty bad, especially #3. I also notice that the exhaust side of the head has some serious carbon buildup - approx 1 - 2 mm of buildup.

    So my question is, should I get the head redone? should I do it myself? If I wanted to do it myself, where would I get the valves and shit from? I want to get it done as cheap as possible.
     
  2. projectxspeed

    projectxspeed Senior Member

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    How do you preform a leak down test on an engine?
     
  3. ohmstable

    ohmstable Senior Member

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  4. projectxspeed

    projectxspeed Senior Member

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  5. MikeBergy

    MikeBergy Blah blah blah....

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    you can't do the head yourself unless you have a press and a valve grinder. The shop I am using charges like $12/valve for a regular reseat and valve 2 angle grind, provided you can do your own disassembly and reassembly. And yeah, that is a lot of carbon. But I had more than that on my piston heads. Why did you do the leakdown in the first place? Poor performance? I did mine with a homemade tester after my timing belt tensioner blew out; my cylinders had lots of leakage.
     
  6. turboB20hatch

    turboB20hatch Senior Member

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    damn im paying 165 right now to have crower dual valve springs installed with top proline racing valves with a resurface and a 3 angle valve grind.

    if you dont know how to do it. pay to have it done.
     
  7. MikeBergy

    MikeBergy Blah blah blah....

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    If that is the price including all the new parts, please refer me to your machine shop, cuz you are getting majorly hooked up.
     
  8. ohmstable

    ohmstable Senior Member

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    I had just bought this engine and decided to do the leakdown test before putting it into my car. Looks like I'll have to get the head work done. I've got to find a place here in Toronto, Canada that will do it.
     
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