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I always set mine up with equal pressures at full closed. I would check th=
em 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. T=
hink 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 vari=
ances you get through some quicker, others impede your movement. I usually =
ended up with eight different shim stacks under my valves to achieve this b=
ut my under-developed 1147 would pull to 8k nice a steady and run a few tic=
ks off the flyboys and ahead of many stronger cars.=C2=A0
On Saturday, July 10, 2021, 08:48:40 AM CDT, marty sukey via Fot <fot@a=
utox.team.net> wrote: =20
=20
Hey all. I am trying to decipher some power loss weirdness I was experien=
cing 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 depende=
nt but what are some of you other Spitfire folks running so I can get some =
ballpark ideas. Heading to PittRace on Wednesday.=C2=A0
Thanks,Marty_______________________________________________
fot@autox.team.net
http://www.fot-racing.com
Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
com
=20
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<div dir="ltr" data-setdir="false">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. </div><div><br></div>
</div><div id="ydp4d4ec34dyahoo_quoted_6793605569"
class="ydp4d4ec34dyahoo_quoted">
<div style="font-family:'Helvetica Neue', Helvetica, Arial,
sans-serif;font-size:13px;color:#26282a;">
<div>
On Saturday, July 10, 2021, 08:48:40 AM CDT, marty sukey
via Fot <fot@autox.team.net> wrote:
</div>
<div><br></div>
<div><br></div>
<div><div id="ydp4d4ec34dyiv9492892091">
<div dir="ltr">
<div style="font-family:Calibri, Helvetica,
sans-serif;font-size:12pt;color:rgb(0, 0, 0);">
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. </div>
<div style="font-family:Calibri, Helvetica,
sans-serif;font-size:12pt;color:rgb(0, 0, 0);">
<br>
</div>
<div style="font-family:Calibri, Helvetica,
sans-serif;font-size:12pt;color:rgb(0, 0, 0);">
Thanks,</div>
<div style="font-family:Calibri, Helvetica,
sans-serif;font-size:12pt;color:rgb(0, 0, 0);">
Marty</div>
</div>
</div>_______________________________________________<br><a
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_______________________________________________
fot@autox.team.net
http://www.fot-racing.com
Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
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