[Fot] Valve spring pressures

[ralph hansen]

 I always set mine up with equal pressures at full closed. I would check them at full open and sometimes adjust them a bit to get better balance when closed. The pressure to open is more critical (told by a very old race tech from back in the day) to balance and smooth out the running at high rpm. Think of it as running through a series of eight spring loaded closed doors. If they are all the same spring pressure you fly through, with spring variances you get through some quicker, others impede your movement. I usually ended up with eight different shim stacks under my valves to achieve this but my under-developed 1147 would pull to 8k nice a steady and run a few ticks off the flyboys and ahead of many stronger cars. 
    On Saturday, July 10, 2021, 08:48:40 AM CDT, marty sukey via Fot <fot at autox.team.net> wrote:  
 
  Hey all. I am trying to decipher some power loss weirdness I was experiencing on the dyno Thursday over 7000 rpm on my Spitfire. One of the paths I am going down is valve spring pressure at full open. I know its cam dependent but what are some of you other Spitfire folks running so I can get some ballpark ideas. Heading to PittRace on Wednesday. 
Thanks,Marty_______________________________________________
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