solid lifter/edelbrock head guys?

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  1. lewtot184

    lewtot184 Well-Known Member

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    anyone here ever do a cold vs hot valve lash check? i'm wondering what kind of differences your getting between hot and cold. my lash cold is all over the map, nothing consistent. trying to weed out "pilot" error vs thermal changes, thanks!
     
  2. dvw

    dvw Well-Known Member

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    My Indy -1's are lashed cold. I feel it is more accurate do to the fact that hot lash the temp can vary greatly. I run .014"/.015" cold = .020" hot. I always check cold and use a sharpie to record any change with that rocker. Then next time I can see if the same rocker changes. In 200 passes I have yet to see more than .002" change in any rocker. Usually 1 or 2 are off .001" when checked. T&D paired rockers, comp 996 springs, .800" lift roller , 200 passes
    Doug
     
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    • lewtot184

      lewtot184 Well-Known Member

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      dvw, i think your on to something. i set the lash hot a few weeks ago . cold i'm getting over .010" variance on the 1,3,5,7, side; just a few thousandths on the 2,4,6,8 side. do you notice the exhaust valve growing noticeably more than the intake went hot? thanks!
       
    • IQ52

      IQ52 Well-Known Member

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      The aluminum head is expanding and lifting the rocker shaft away from the cam and valve tips. On the aluminum heads it's pretty typical to be .006" loose hot, after setting the lash cold. If your lash is .020" hot, just set it .014" cold.

      If you are going to set it hot, do one side, fire the engine back up and warm it up, then do the second side.
       
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      • lewtot184

        lewtot184 Well-Known Member

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        i think your last sentence is my problem. i think going to a cold setting is going to be more consistent for me.
         
      • Propwash

        Propwash Well-Known Member

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        I have the same issue with my eddy heads and solid lifter Comp Cam. Rechecking cold, there's no rhyme or reason. I stick with Comp's recommendation to set hot. PIA though.....get the car hot, pull the cover on one side, set as fast as possible without burning the crap out of myself, put the cover back on, start up the car again, get it hot and start all over again.

        Come spring I may try the -.006 theory. Set them cold and see where they sit hot again. Thanks!
         
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        • dvw

          dvw Well-Known Member

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          That's why I set the exhaust .001" looser. For those of you that believ in hot setting. Set them cold, run it and get it hot. Pull the cover and check them all quickly and record the readings. Let it cool over night and recheck. calculate the difference. You won't have to set it hot again. Mine is .020" hot, .014/.015 cold on average. How hot is hot? check it warmed up and right after a pass. Then tell me what you see. I doubt they'll be the same. Get it in the ball park and adjust from there for best performance, just not to loose, It 's not valve train friendly.
          Doug
           
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          • 66Satellite47

            66Satellite47 FBBO Gold Member FBBO Gold Member

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            I'm with dvw, set them cold, don't burn yourself & check 'em again hot. The difference cold/hot should stay consistent over time. Good records are a help.
             
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            • lewtot184

              lewtot184 Well-Known Member

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              when i put this engine together i did the -.006" lash reduction. on start-up i had some low rpm running issues









              i reduced lash .006" when i put the engine together with the intent of getting some run time on the new parts and then re-setting hot. apparently that's not going to work. there was .008"-.010" lash difference between the odd fire and even fire bank. the engine runs cool, especially in this weather, and i think the cool down was greater than i would have expected. i'll start a cold lash setting work-up and stick to it. thanks everyone!
               
            • Canyon707

              Canyon707 Well-Known Member

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              I see big differences between hot and cold. I have a comp cam and al heads. I set cold allowing what comp recommends. I was told by other pro drag racers to set one hot then check it after the engine is completely cold and make the adjustments at that point 2014-11-20 15.19.50.jpg .these valve covers make it easy to adjust hot with no mess.
               
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              • 69 GTX

                69 GTX FBBO Gold Member FBBO Gold Member

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                Will how often do you have to set yours? Trying to decide between Hyd roller & solid roller.
                 
              • lewtot184

                lewtot184 Well-Known Member

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                what i've noticed is frequent adjustments are more due to the person doing the adjusting than due to parts wear. we usually create our own maintenance headaches. go solid. juice lifters may be a greater headache with a roller.



                just got done re-adjusting the lash cold. will do a test drive shortly.
                 
              • lewtot184

                lewtot184 Well-Known Member

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                like frankenstein; it's alive, it's alive! kinda funny for as much as i loosened some of the lash up it didn't make much difference in the way it drove.
                 
              • 383man

                383man Well-Known Member

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                Thats what I do. Mine calls for .020 hot and I set them at .014 cold. I drive my car alot on the street but I only adjust the valves once a year and they are always right on or very close. Ron
                 
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                • dvw

                  dvw Well-Known Member

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                  • Canyon707

                    Canyon707 Well-Known Member

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                    I think that's the best.

                    - - - Updated - - -

                     
                  • Bigal75

                    Bigal75 Well-Known Member

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                    Ok I'm going to set my cold too - solid lifter and the recommendation is 0.016 - I have aluminum heads as well - where should I set them at?
                     
                  • lewtot184

                    lewtot184 Well-Known Member

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                  • Bigal75

                    Bigal75 Well-Known Member

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                    No its a Bullet cam. Yeah, that seems kind of tight huh.
                     
                  • lewtot184

                    lewtot184 Well-Known Member

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                    call bullet and see if there's someone there that can talk to you about tappet/lobe clearance minimums. there has to be a minimum running clearance on the ramps. i'm not a comp cams fan but they do have some tight clearance profiles too; but i'd be afraid of getting one of their clearasil junkies on the phone if i was needing hard core info.
                     
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