Rebuilt 318 install problem

Small Block Mopar Engine

  1. Calipag

    Calipag FABO Gold Member FABO Gold Member

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    I am having the toughest time setting the timing on our freshly rebuilt 318 motor. I have set the #1 piston to TDC on the compression stroke. Setting the distributor to 10 degrees advance as a starting point with the vacuum advance disconnected. It will not start consistently, and when it does I can not find the timing mark on the balancer with the timing light. These are the thing I've checked over and over:


    1) Spark plug wires in the correct location on cap and motor
    2) TDC #1 piston on the compression stroke (The timing line on the balancer matches TDC)
    3) New Factory HEI distributor
    4) New cap and rotor
    5) Running a GM module and Mopar coil - polarity to the distributor has been checked and is correct

    When the engine is running it crackles out the carb.

    The engine is a 74 318 motor, with a Edelbrock LD4B intake and Edelebrock 600 carb. The engine has an RV cam and the heads were milled .015.

    I just can't understand were I'm going wrong. I am pulling what little hair I have left out!

    I have a link (video) to the motor running , i'm not sure if the link will work.

    iCloud - Loading …

    Save my sanity and tell me what I'm doing wrong!

    Thank you!!!!
     
  2. brian6pac

    brian6pac Well-Known Member

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    Where is the timing mark ? Take your timing light and go around the balancer. Your on the drivers side front cyl ?
     
  3. Calipag

    Calipag FABO Gold Member FABO Gold Member

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    I can not find the mark. I've looked around the balancer and even had a mirror trying to find it- but could not see it!
     
  4. brian6pac

    brian6pac Well-Known Member

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    Clamp your timing light on other wires it has to show up some where, try #6 that's 180 out. I would try all the wires till you find it then you can figure out what's up.
     
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    • Garrett Ellison

      Garrett Ellison Amateur driver on public roadway, do not imitate..

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      Mark your balancer from tdc line out to 60 degrees or buy a timing tape. I am suspicious of cross firing or plug wires swapped. I seen you mentioned Mopar coil? is it a stock type? I would try an e core coil or a high performance coil. Is the mechanical advance causing it to over advance when you are revving it up? Here is a link to the \6 site with in depth hei installation, it may be worth checking out if you've not seen it before. HEI Electronic Ignition Retrofit How-To - Slant Six Forum
       
      Last edited: Jan 29, 2019
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      • 67Dart273

        67Dart273 Well-Known Member

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        Forget the coil for now

        You know how to use a piston stop? Verify that the timing marks are correct

        Either the timing mark is wrong because the balancer has slipped, or you have a mismatched timing cover/ balancer, or you have the pickup coil leads reversed Google "rotor phasing"

        You ARE connecting to the front plug on the driver's side, right?

        (Fords are on pass side LOL)
         
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        • thesiren74

          thesiren74 Well-Known Member

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          180° out.
           
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          • thesiren74

            thesiren74 Well-Known Member

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            Pull distributer and turn the rotor 180° drop it back in and fire it up.
             
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            • thesiren74

              thesiren74 Well-Known Member

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              Another thing is one plug terminal off, i've done it before you will not get enough timing.
               
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              • Garrett Ellison

                Garrett Ellison Amateur driver on public roadway, do not imitate..

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                Also, check that reluctor is in proper position for small block, the big block distributor uses the same reluctor, but it is in reverse rotation. If it is installed in reverse rotation, it will cause similar condition.
                 
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                • brian6pac

                  brian6pac Well-Known Member

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                  The engine runs, it can't be 180 out
                   
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                  • thesiren74

                    thesiren74 Well-Known Member

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                    Well its either a terminal off or the ignition is junk.
                     
                  • thesiren74

                    thesiren74 Well-Known Member

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                    Just watched the video,yeah something is up with the ignition do you have a stock one laying around to test?
                     
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                    • Garrett Ellison

                      Garrett Ellison Amateur driver on public roadway, do not imitate..

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                      When I re-curved my distributor, I had wiped my index mark off my reluctor during cleanup and installed it upside down by accident. I had the same exact symptoms, pulled distributor and turned reluctor over, problem solved. But, a thorough recheck is in order, it's usually the minor details that lead to the most trouble. One terminal, two wires crossed. This is basic knowledge and you probably don't need it, but it may help others out.
                       
                      Last edited: Jan 30, 2019
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                      • memike

                        memike Super Moderator Staff Member FABO Gold Member

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                        Would an intake vacuum leak do this or am I wrong?
                         
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                        • Garrett Ellison

                          Garrett Ellison Amateur driver on public roadway, do not imitate..

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                          It would have to be a pretty severe one, but the back crack through the carburetor is indicative of a timing issue. Do you have second timing light to verify with?
                           
                          Last edited: Jan 30, 2019
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                          • PRH

                            PRH Well-Known Member

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                            I’d try reversing the wires coming from the dist to the module.

                            I’d also put a hole in the dist cap to verify the rotor phasing.
                             
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                            • Bad Sport

                              Bad Sport HALF A BUBBLE OFF Staff Member FABO Gold Member

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                              Do yourself a favor, set the #1 piston to TDC on the compression stroke again.

                              Lift up the distributor cap once you have it and make sure the rotor is pointing at the front intake bolt, drivers side.

                              If that isn't right, correct it. If it is correct, double and triple check your plug wires.

                              Go from there.
                               
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                              • Calipag

                                Calipag FABO Gold Member FABO Gold Member

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                                I will be checking it again with another light tonight.
                                 
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                                • Calipag

                                  Calipag FABO Gold Member FABO Gold Member

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                                  I agree, and have done that procedure at least 5 times and I'm getting the same results.

                                  I feel like I'm checking all the right boxes and still getting a wrong result.
                                   
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                                  • Calipag

                                    Calipag FABO Gold Member FABO Gold Member

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                                    I've tried reversing the wire from the dist to the module and it makes things worse. Meaning it won't run at all and spits and back fires.
                                     
                                  • Bad Sport

                                    Bad Sport HALF A BUBBLE OFF Staff Member FABO Gold Member

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                                    Been there.

                                    I once crossed 5 and 7 and I kept missing it, lol.

                                    I dunno how, my buddy came down and looked at it and fixed it. :BangHead:

                                    I just wasn't seeing it for some reason.
                                     
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                                    • Calipag

                                      Calipag FABO Gold Member FABO Gold Member

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                                      It is a brand new distributor; not that means it's right but I feel it's something else. I've been thru the wires countless times to be sure of the order and they are correct.

                                      It just does not make sense to me at all. I wish I had a second set of eye to look over the car in person to see what I'm missing! I'm at that point! I hate to throw in the towel but it's kicking my butt!
                                       
                                    • Calipag

                                      Calipag FABO Gold Member FABO Gold Member

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                                      I do not have the old ignition. I followed @TrailBeast instructions thoroughly and feel it's more of a timing situation. At this point I'd try anything.
                                       
                                    • JoeSBP

                                      JoeSBP RLTW!

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                                      did you verify TDC with a piston stop?
                                      what distributor are you using?
                                      What method did you use for setting it at 10°?
                                       
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