Flex Hone ahoy...

Discussion in 'Small Block Mopar Engine' started by bschubarg, Apr 3, 2018.

  1. bschubarg

    bschubarg FABO Gold Member FABO Gold Member

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    Before and after pics after honing... big fan of Flex Hone.....318 stock bore with intake unshouding...

    Now gap chrome moly rings.... what gap for stock pistons???

    DFEBE989-DA85-4F61-A444-85C95B6BFB49.jpeg

    83C68045-B175-4423-A89C-7910EFF33FAC.jpeg
     
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    • james m smith

      james m smith New Member

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      check gap at top and bottom for cylinder taper
       
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      • harrisonm

        harrisonm Well-Known Member

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        Nice work. Great cross hatch pattern. You can hone my block anytime
         
      • Krooser

        Krooser Reform School Graduate

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        What gap does the ring mfg suggest...better too big than too small
         
      • 70aarcuda

        70aarcuda Master Hoader of SBM FABO Gold Member

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        most want .004 per inch of bore.....4 inch bore would use .016 top ring minimum,,,,,,

        what grit did you use?
         
        Last edited: Apr 21, 2018
      • krazykuda

        krazykuda FABO Gold Member FABO Gold Member Technical Editor

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        Actually the highest side load on the piston is when the crank is 90° to the connecting rod travel, which is at mid stroke...

        I would check the top, bottom, and middle of ring travel of the bore to establish taper....
         
        Last edited: Apr 21, 2018
      • famous bob

        famous bob mopar misfit

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        I personally like a hair more crosshatch. Did u check the clearance and taper first ???
         
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        • bschubarg

          bschubarg FABO Gold Member FABO Gold Member

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          Ring gap was set at .025. I’m sure there’s taper but the whole purpose for me anyways was to re-ring. I’ve put a dozen miles so far just to break it in....after a few hundred I’ll do a compression check... looks like the flex hone did a great job
           
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          • oldkimmer

            oldkimmer Well-Known Member

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            Yes, they look like they do a great job. Kim
             
          • bschubarg

            bschubarg FABO Gold Member FABO Gold Member

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            Compression test complete. Average of 130 psi +/- %5. So what does that mean...?
             
          • oldkimmer

            oldkimmer Well-Known Member

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            Seems pretty decent. Kim
             
          • Marcohotrod

            Marcohotrod Well-Known Member

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            carb open? warm or not? big cam? 130 is a little low. more crosshatch=stroking in and out faster would be better
             
          • bschubarg

            bschubarg FABO Gold Member FABO Gold Member

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            Whoops... engine warm... but did not open carb.... would that increase or decrease PSI?
             
          • bschubarg

            bschubarg FABO Gold Member FABO Gold Member

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            Small cam.... 110 centerline straight up
             
          • bschubarg

            bschubarg FABO Gold Member FABO Gold Member

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            218 @ at 50
             
          • bschubarg

            bschubarg FABO Gold Member FABO Gold Member

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            Well for those who are curious... I retested with engine warm and carb WOT....128 PSI.... interesting the PSI decreased... didn't expect that.
             
          • IQ52

            IQ52 Well-Known Member

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            What does that mean to you? 110 LSA w/ 110 ICL? Or something else? Dot-to-dot?
             
          • Marcohotrod

            Marcohotrod Well-Known Member

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            Carb open may give a higher number, or maybe not. To me 110 centerline is intake centerline, which on the average small mopar I like installed at 107. And I like 110 lobe seperation angle. I am old school
             
          • RustyRatRod

            RustyRatRod Just another dumbass. FABO Gold Member Technical Editor

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            It does not matter which way you do it, since all you are looking for is the percentage difference between each cylinder. As long as you do all of the cylinders with the carburetor in the same position, you will yield the same percentage results.
             
          • RustyRatRod

            RustyRatRod Just another dumbass. FABO Gold Member Technical Editor

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            If you only stabbed it in "dot to dot" I "just bet" you could see some fantastic results if you put a degree wheel on it and advanced it some. Especially if it is retarded dot to dot. You could make a significant difference in bottom end torque.
             
          • Marcohotrod

            Marcohotrod Well-Known Member

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            Set at .025" is a bit much. If u want more low end, advance the cam, degree wheel not needed.
             
          • bschubarg

            bschubarg FABO Gold Member FABO Gold Member

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            Just purchased a three way double roller. Will advance cam this week...... stand by.... I should start a new thread....
             
          • yellow rose

            yellow rose Doctor of Thinkology.

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            I'm going to ask the same question rusty asked...did you degree the cam or line up the dots? They ain't the same.

            If you are going to change the timing set you better damn sure degree the cam BEFORE you change anything to see where you are, and then degree it again with the new parts. If you don't, you have no clue where the cam is timed.

            And I damned sure ain't going to tell you to move a cam without degreeing first. That's just crazy and the same kind of crap guys did when I was in high school.
             
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            • famous bob

              famous bob mopar misfit

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              GREE W/ THE ABOVE POST! A bunch of people have done things like changing cam timing w/o degreeing, BUT I WOULDN`T ! unless it was a engine I built and had previously set it up, and knew what the clearances and timing was already, and knew that it would take the change.
               
            • bschubarg

              bschubarg FABO Gold Member FABO Gold Member

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              Even though we are getting off topic here I would like to report that I installed the 3-Way chain for 4 degrees advance and not having degreed the cam in the first place; CrustyFatRod :) was correct. It made a world of difference in the low end performance.
               
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