Tdc tool

Discussion in 'PSI Superchargers Tech Questions' started by promodracer, Apr 30, 2014.

  1. promodracer

    promodracer Member

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    who has the nicest Tdc tool to thread into a hemi with rod and return spring that will accept basic dial indicator. Any pics or links?
    Thanks guys.
     
    #1
    promodracer, Apr 30, 2014
  2. underby6

    underby6 Active Member

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    BAE has the nicest one, no pics on his website but it's an extremely handy piece. It also does cam timing on both lobes, any cylinder you'd like. I don't like checking TDC with a dial indicator though, use a stop instead. Run the motor both directions til it hits the stop, equal distance between them is your zero.

    Brandon Booher
    NHRA TAD #3
    Torque MGMT. - Owner
     
    #2
    underby6, May 1, 2014
  3. promodracer

    promodracer Member

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    best tdc indicator

    thanks guys
     
    #3
    promodracer, May 3, 2014
  4. Mark Leigh

    Mark Leigh Member

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    Ditto what Brandon said -- you shouldn't do a location of true TDC with a indicator ---
     
    #4
    Mark Leigh, May 3, 2014
  5. promodracer

    promodracer Member

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    tdc indicator

    OK I'm convienced to use basic tdc tool.
    Thanks guys.
     
    #5
    promodracer, May 15, 2014
  6. Wildcatracing

    Wildcatracing Member

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    Finding TDC

    Hi guys, can you explain what the typical difference between the 2 methods would be? I have never done a back to back comparison and would be interested to know. Thanks
     
    #6
    Wildcatracing, May 15, 2014
  7. GregM784

    GregM784 Member

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    Using a mech stop is preffered.

    When you use a dial indicator, it can be off by x amount of degrees because of piston dwell. Dwell changes with stroke & rod length, so how long is your piston at TDC dwell? who knows. If you use a mech stop, you split the difference from both stopping points and you are at exact TDC.
     
    #7
    GregM784, May 19, 2014
  8. ozrace

    ozrace New Member

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    I've always used a dial indicator, check the piston coming up to the same distance both ways, and split then difference.
     
    #8
    ozrace, May 19, 2014
  9. Fuel Cars

    Fuel Cars AA/AM

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    This the most accurate.
     
    #9
    Fuel Cars, May 19, 2014
  10. GregM784

    GregM784 Member

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    That would work. I was referring to when you were looking at when it stopped at TDC. My bad.
     
    #10
    GregM784, May 20, 2014
  11. Ken Sitko

    Ken Sitko Super Comp

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    I have found that the dial indicator method is within 1 degree.
     
    #11
    Ken Sitko, May 21, 2014
  12. Will Hanna

    Will Hanna We put the 'inside' in Top Alcohol
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    degree

    What's a degree amongst friends?

    I don't know how much more accurate you can get than a mechanical stop. Of course if you push on the thing hard enough you can vary it slightly. I try to get it within a quarter degree. New style RCD pointer is pretty good too.

    If you have an older style drop in pointer from RCD, I would recommend epoxying it in the holder to get rid of slack and movement.

    I like to triple check it and if there is someone else in the shop have them come verify. TDC is kind of the cornerstone of the engine.
     
    #12
    Will Hanna, May 21, 2014

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