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Marty, how much over 7k are you taking your engine? Valve springs are inde=
ed a wear item, I replace them on the engines I build by probably the 3rd r=
ebuild. This is true for all makes of engines. I have a very nice spring =
checker that I use and checking the spring pressures at install height and =
nose (max compression) is an integral part of each rebuild.
________________________________
From: Fot <fot-bounces@autox.team.net> on behalf of Scott Janzen via Fot <f=
ot@autox.team.net>
Sent: Saturday, July 10, 2021 7:27 AM
To: marty sukey <trmarty@hotmail.com>
Cc: 'Friends of Triumph' Triumph <fot@autox.team.net>
Subject: Re: [Fot] Valve spring pressures
I shim mine to meet the cam maker=92s requirements, and usually find there =
is a range of a few shims within which they are all set the same. I also f=
ind that after two seasons the springs have lost about 30 lb seat pressure.=
I routinely rev my GT6 to 7k (same valve train as your Spit) and figured =
out that at a typical race weekend at Summit Point it might go to redline 5=
60 times (about eight times a lap). your results may vary!
Anyway, a 30 lb loss is over 10%. My settings are roughly 60 lb closed, 23=
0 lb open at 0.523 lift. I run the Isky VWE 005/SP116. They also make a s=
et with a softer inner spring (SP006) if you don=92t need as much spring pr=
essure.
I have a fairly radical cam, and these springs are adequate, have been runn=
ing them for years. Other manufacturers offer what seem to be similar but =
not identical spec springs, but if you open up the box and they have orang=
e paint on them, they are these Iskys. It seems others re-package and sell=
them. I=92ve found this twice from other manufacturers, such as comp cams=
.
My guesses are:
* you may not routinely run over 7k and have not noticed this before.
* It may be valve float
* If it=92s a recent change, look for a broken valve spring
* make sure your spring loads match the cam maker=92s requirements.
* If you have been running these springs =93forever=94, replace them. =
They are a wear item.
See you at Pitt race!
On Jul 10, 2021, at 10:07 AM, ralph hansen via Fot <fot@autox.team.net<mail=
to:fot@autox.team.net>> wrote:
I always set mine up with equal pressures at full closed. I would check the=
m at full open and sometimes adjust them a bit to get better balance when c=
losed. 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. Th=
ink 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 varia=
nces you get through some quicker, others impede your movement. I usually e=
nded up with eight different shim stacks under my valves to achieve this bu=
t my under-developed 1147 would pull to 8k nice a steady and run a few tick=
s off the flyboys and ahead of many stronger cars.
On Saturday, July 10, 2021, 08:48:40 AM CDT, marty sukey via Fot <fot@autox=
Hey all. I am trying to decipher some power loss weirdness I was experienci=
ng 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 ba=
llpark ideas. Heading to PittRace on Wednesday.
Thanks,
Marty
_______________________________________________
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Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
com
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<body dir=3D"ltr">
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
color: rgb(0, 0, 0);">
Marty, how much over 7k are you taking your engine? Valve springs are=
indeed a wear item, I replace them on the engines I build by probably the =
3rd rebuild. This is true for all makes of engines. I have a ve=
ry nice spring checker that I use and checking
the spring pressures at install height and nose (max compression) is an in=
tegral part of each rebuild.</div>
<div>
<div id=3D"appendonsend"></div>
<div style=3D"font-family:Calibri,Helvetica,sans-serif; font-size:12pt; col=
or:rgb(0,0,0)">
<br>
</div>
<hr tabindex=3D"-1" style=3D"display:inline-block; width:98%">
<div id=3D"divRplyFwdMsg" dir=3D"ltr"><font face=3D"Calibri, sans-serif" co=
lor=3D"#000000" style=3D"font-size:11pt"><b>From:</b> Fot <fot-bounces@a=
utox.team.net> on behalf of Scott Janzen via Fot <fot@autox.team.net&=
gt;<br>
<b>Sent:</b> Saturday, July 10, 2021 7:27 AM<br>
<b>To:</b> marty sukey <trmarty@hotmail.com><br>
<b>Cc:</b> 'Friends of Triumph' Triumph <fot@autox.team.net><br>
<b>Subject:</b> Re: [Fot] Valve spring pressures</font>
<div> </div>
</div>
<div class=3D"" style=3D"word-wrap:break-word; line-break:after-white-space=
">I shim mine to meet the cam maker=92s requirements, and usually find ther=
e is a range of a few shims within which they are all set the same. I=
also find that after two seasons the springs
have lost about 30 lb seat pressure. I routinely rev my GT6 to 7k (s=
ame valve train as your Spit) and figured out that at a typical race weeken=
d at Summit Point it might go to redline 560 times (about eight times a lap=
). your results may vary!
<div class=3D""><br class=3D"">
<div class=3D"">Anyway, a 30 lb loss is over 10%. My settings are rou=
ghly 60 lb closed, 230 lb open at 0.523 lift. I run the Isky VWE 005/=
SP116. They also make a set with a softer inner spring (SP006) if you=
don=92t need as much spring pressure.</div>
<div class=3D"">I have a fairly radical cam, and these springs are adequate=
, have been running them for years. Other manufacturers offer what se=
em to be similar but not identical spec springs, but if you open up the box=
and they have orange paint on them, they
are these Iskys. It seems others re-package and sell them. I=
=92ve found this twice from other manufacturers, such as comp cams.</div>
<div class=3D""><br class=3D"">
</div>
<div class=3D"">My guesses are:</div>
<div class=3D"">
<ul class=3D"x_MailOutline">
<li class=3D"">you may not routinely run over 7k and have not noticed this =
before.</li><li class=3D"">It may be valve float</li><li class=3D"">If it=
=92s a recent change, look for a broken valve spring</li><li class=3D"">mak=
e sure your spring loads match the cam maker=92s requirements.</li><li clas=
s=3D"">If you have been running these springs =93forever=94, replace them. =
They are a wear item.</li></ul>
<div class=3D""><br class=3D"">
</div>
<div class=3D"">See you at Pitt race!</div>
<div><br class=3D"">
<div class=3D"">On Jul 10, 2021, at 10:07 AM, ralph hansen via Fot <<a h=
ref=3D"mailto:fot@autox.team.net"; class=3D"">fot@autox.team.net</a>> wro=
te:</div>
<br class=3D"x_Apple-interchange-newline">
<div class=3D"">
<div class=3D"">
<div class=3D"x_ydp359c3cd6yahoo-style-wrap" style=3D"font-family:Helvetica=
Neue,Helvetica,Arial,sans-serif; font-size:13px">
<div class=3D""></div>
<div dir=3D"ltr" class=3D"">I always set mine up with equal pressures at fu=
ll 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 (t=
old 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 a=
re 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 8=
k nice a steady and run a few ticks off the flyboys and ahead of many stron=
ger cars. </div>
<div class=3D""><br class=3D"">
</div>
</div>
<div id=3D"x_ydp4d4ec34dyahoo_quoted_6793605569" class=3D"x_ydp4d4ec34dyaho=
o_quoted">
<div class=3D"" style=3D"font-family:'Helvetica Neue',Helvetica,Arial,sans-=
serif; font-size:13px; color:#26282a">
<div class=3D"">On Saturday, July 10, 2021, 08:48:40 AM CDT, marty sukey vi=
a Fot <<a href=3D"mailto:fot@autox.team.net"; class=3D"">fot@autox.team.n=
et</a>> wrote:
</div>
<div class=3D""><br class=3D"">
</div>
<div class=3D""><br class=3D"">
</div>
<div class=3D"">
<div id=3D"x_ydp4d4ec34dyiv9492892091" class=3D"">
<div dir=3D"ltr" class=3D"">
<div class=3D"" style=3D"font-family:Calibri,Helvetica,sans-serif; font-siz=
e:12pt">Hey all. I am trying to decipher some power loss weirdness I was ex=
periencing on the dyno Thursday over 7000 rpm on my Spitfire. One of the pa=
ths I am going down is valve spring
pressure at full open. I know its cam dependent but what are some of you o=
ther Spitfire folks running so I can get some ballpark ideas. Heading to Pi=
ttRace on Wednesday. </div>
<div class=3D"" style=3D"font-family:Calibri,Helvetica,sans-serif; font-siz=
e:12pt"><br class=3D"">
</div>
<div class=3D"" style=3D"font-family:Calibri,Helvetica,sans-serif; font-siz=
e:12pt">Thanks,</div>
<div class=3D"" style=3D"font-family:Calibri,Helvetica,sans-serif; font-siz=
e:12pt">Marty</div>
</div>
</div>
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