Clearancing Molnar rods for roller cam

Discussion in 'Small Block Tech' started by Mark Demko, Jul 2, 2018.

  1. Mark Demko

    Mark Demko Well-Known Member

    All done, I removed 4.5 grams. I made sure each rod weighed the same.... 622.8 g
     
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  2. sean Buick 76

    sean Buick 76 Buick Nut Staff Member

    So did you decide if you are going to have the crank rebalanced or run it?
     
  3. Mark Demko

    Mark Demko Well-Known Member

    Im running it.
    I installed all the pistons, and it turns over like velvet.
    My machinist said it will be off a bit, but nothing to worry about.
     
    Last edited: Jul 8, 2018
  4. Bens99gtp

    Bens99gtp Well-Known Member

    Did you by chance figure out how clearance you have between the rod and cam. Metal parts do expand when warm and moving........I've heard the top end of rod at high rpm can stretch .020 or more depending on rod. Not sure what the minute rod to cam clearness should be
     
    Mark Demko likes this.
  5. sean Buick 76

    sean Buick 76 Buick Nut Staff Member

    You in good hands with those guys so I’m sure it will be fine...
     
  6. Mark Demko

    Mark Demko Well-Known Member

    No I haven't checked, I tried looking at the #1 when I gained clearance, I wanted to see "how much" room I had, but DAMN, its tuff to near impossible to see:mad:
     
  7. 300sbb_overkill

    300sbb_overkill Well-Known Member

    You need one of those little round mirrors on a stick they sell at the auto parts stores for that, will make life so much easier.;)
     
    Mark Demko likes this.
  8. Mark Demko

    Mark Demko Well-Known Member

    I have that and an inspection camera (bore scope) Im gonna try again, maybe I can climb in there:p
     
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  9. Jim Weise

    Jim Weise GOT AIR?

    Mark,

    To measure your cam to rod clearance, a nice fat roll of solder works well... just align it along the length of the rod and rotate the motor thru the contact zone.. it will compress the solder at the point of minimum clearance.. You might have to pop the piston on the same journal out, to get good access.. then measure the crushed area on the solder with a vernier caliper. Most of us like to see a min of .050 clearance.
    JW
     
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  10. Mark Demko

    Mark Demko Well-Known Member

    Thanks Jim!!!!
     

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