--===============8123020006287152488==
Content-Transfer-Encoding: 7bit
--Apple-Mail-76D785BF-5D57-45F1-80B2-9892F93A9646
charset=utf-8
Content-Transfer-Encoding: quoted-printable
Nick;
With an aluminum flywheel the problem could be with the steel friction surfa=
ce. Are all the machine screws tight? Does the disc interfere with the alumi=
num around the periphery? Check for cracks. Take it off and use the magma fl=
ux penetrant crack test or even better have a shop do it on the steel surfac=
e.=20
Even though the surface of the insert looks ok, it could have a glaze on it t=
hat grabs the disc. I=E2=80=99ve seen the on disc brakes. The brakes will b=
egin to judder - alternating slip grip - yet the discs would look fine. Tak=
ing sandpaper to the discs will remove any material build up and the judder g=
oes away. Best way to do this on the flywheel is to have a machine shop take=
a fine cut - or replace the insert. If it is a very old Tilton like mine, t=
he insert is available from AASCO Motorsports in Anaheim CA. 714 758 8500.
Hope this helps!
Phil
Sent from my iPhone
> On Apr 22, 2020, at 10:27 AM, Nick Black via Fot <fot@autox.team.net> wrot=
e:
>=20
> =EF=BB=BF
> Thanks for all the ideas about this...
>=20
> Mleccese - the car has a rubber seal on the crank and double seals on the t=
rans...nice and dry in there, no oil leaks.
>=20
> Tony - the car has a Tilton 7.25" setup with the "copper" colored full cir=
cumference disc (not individual "pucks") with a Tilton aluminum flywheel.
>=20
> Marcel - the metal clutch line was not changed, but it wasn't kinked anywh=
ere and I could blow thru it ok. The clutch feels as it always has just has t=
his "instant" on/off that the driver cannot modulate.
>=20
> David - the slave rod was in the center hole, but it worked the same when i=
n the lower hole.
> The flywheel looks perfect and there is no measureable "bell" to it, no he=
at cracks or burrs.
>=20
> Phil - the first "repair" was the disc, throwout sleeve. trans input shaft=
and diff change. The "full Monte" of changes have not been on track yet, bu=
t nothing that was replaced has been out of spec anywhere. The car has the s=
teel throwout bearing flange and was pinned as it just doesn't seem rite to l=
et steel on steel rotate. The pin was moved 90 degrees from where it was in c=
ase there was any unseeable wear from the fork on the sleeve.
>=20
> Mike - Doubtful that anything "downstream" of the clutch is the problem. T=
he trans was disassembled and the input shaft was changed after the first ty=
me. The driveshaft was inspected and rebalanced and the diff was changed to o=
ne that has been faultless for years, still had the problem.
>=20
> The only other thing that has been changed is the clutch master diameter..=
.went one size smaller as I thought that might give the driver a bit better c=
hance to "modulate" the pedal. The interface twixt the throwout bearing and t=
he throwout bearing flange has been relieved in case it may have gotten hung=
up somehow on the sleeve. The clearance twixt sleeve and throwout bearing f=
lange is also within specs and moves easily by hand.
>=20
> I'm about out of ideas here at this point and I have no confidence that an=
y of these changes will affect the issue. It sure seems like I'm missing som=
ething here!
>=20
> lack-o-slip here in NorCal
> Nick
> _______________________________________________
> fot@autox.team.net
>=20
> http://www.fot-racing.com
>=20
> Donate: http://www.team.net/donate.html
> Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
> Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/vfracing@aol=
.com
>=20
>=20
--Apple-Mail-76D785BF-5D57-45F1-80B2-9892F93A9646
charset=utf-8
Content-Transfer-Encoding: quoted-printable
<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto">Nick;<div>With an aluminum flywheel the pro=
blem could be with the steel friction surface. Are all the machine screws ti=
ght? Does the disc interfere with the aluminum around the periphery? Check f=
or cracks. Take it off and use the magma flux penetrant crack test or even b=
etter have a shop do it on the steel surface. </div><div>Even though th=
e surface of the insert looks ok, it could have a glaze on it that grabs the=
disc. I=E2=80=99ve seen the on disc brakes. The brakes will begin to j=
udder - alternating slip grip - yet the discs would look fine. Taking s=
andpaper to the discs will remove any material build up and the judder goes a=
way. Best way to do this on the flywheel is to have a machine shop take a fi=
ne cut - or replace the insert. If it is a very old Tilton like mine, t=
he insert is available from AASCO Motorsports in Anaheim CA. 714 758 8500.</=
div><div>Hope this helps!</div><div>Phil<br><br><div dir=3D"ltr">Sent from m=
y iPhone</div><div dir=3D"ltr"><br><blockquote type=3D"cite">On Apr 22, 2020=
, at 10:27 AM, Nick Black via Fot <fot@autox.team.net> wrote:<br><br><=
/blockquote></div><blockquote type=3D"cite"><div dir=3D"ltr">=EF=BB=BF<div c=
lass=3D"yahoo-style-wrap" style=3D"font-family:Helvetica Neue, Helvetica, Ar=
ial, sans-serif;font-size:13px;"><div dir=3D"ltr" data-setdir=3D"false">Than=
ks for all the ideas about this...</div><div dir=3D"ltr" data-setdir=3D=
"false"><br></div><div dir=3D"ltr" data-setdir=3D"false">Mleccese - the car h=
as a rubber seal on the crank and double seals on the trans...nice and dry i=
n there, no oil leaks.</div><div dir=3D"ltr" data-setdir=3D"false"><br></div=
><div dir=3D"ltr" data-setdir=3D"false">Tony - the car has a Tilton 7.25" se=
tup with the "copper" colored <span><span style=3D"color: rgb(0, 0, 0);=
font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;">ful=
l circumference disc (not individual "pucks") with a Tilton aluminum flywhee=
l.</span></span></div><div dir=3D"ltr" data-setdir=3D"false"><span><span sty=
le=3D"color: rgb(0, 0, 0); font-family: "Helvetica Neue", Helvetic=
a, Arial, sans-serif;"><br></span></span></div><div dir=3D"ltr" data-setdir=3D=
"false"><span><span style=3D"color: rgb(0, 0, 0); font-family: "Helveti=
ca Neue", Helvetica, Arial, sans-serif;">Marcel - the metal clutch line=
was not changed, but it wasn't kinked anywhere and I could blow thru it ok.=
The clutch feels as it always has just has this "instant" on/off that the d=
river cannot modulate.</span></span></div><div dir=3D"ltr" data-setdir=3D"fa=
lse"><span><span style=3D"color: rgb(0, 0, 0); font-family: "Helvetica N=
eue", Helvetica, Arial, sans-serif;"><br></span></span></div><div dir=3D=
"ltr" data-setdir=3D"false"><span><span style=3D"color: rgb(0, 0, 0); font-f=
amily: "Helvetica Neue", Helvetica, Arial, sans-serif;">David - th=
e slave rod was in the center hole, but it worked the same when in the lower=
hole.</span></span></div><div dir=3D"ltr" data-setdir=3D"false"><span><span=
style=3D"color: rgb(0, 0, 0); font-family: "Helvetica Neue", Helv=
etica, Arial, sans-serif;">The flywheel looks perfect and there is no measur=
eable "bell" to it, no heat cracks or burrs.</span></span></div><div dir=3D"=
ltr" data-setdir=3D"false"><span><span style=3D"color: rgb(0, 0, 0); font-fa=
mily: "Helvetica Neue", Helvetica, Arial, sans-serif;"><br></span>=
</span></div><div dir=3D"ltr" data-setdir=3D"false"><span><span style=3D"col=
or: rgb(0, 0, 0); font-family: "Helvetica Neue", Helvetica, Arial,=
sans-serif;">Phil - the first "repair" was the disc, throwout sleeve. trans=
input shaft and diff change. The "full Monte" of changes have not been on t=
rack yet, but nothing that was replaced has been out of spec anywhere. The c=
ar has the steel throwout bearing flange and was pinned as it just doesn't s=
eem rite to let steel on steel rotate. The pin was moved 90 degrees from whe=
re it was in case there was any unseeable wear from the fork on the sleeve.<=
/span></span></div><div dir=3D"ltr" data-setdir=3D"false"><span><span style=3D=
"color: rgb(0, 0, 0); font-family: "Helvetica Neue", Helvetica, Ar=
ial, sans-serif;"><br></span></span></div><div dir=3D"ltr" data-setdir=3D"fa=
lse"><span><span style=3D"color: rgb(0, 0, 0); font-family: "Helvetica N=
eue", Helvetica, Arial, sans-serif;">Mike - Doubtful that anything "dow=
nstream" of the clutch is the problem. The trans was disassembled and the in=
put shaft was changed after the first tyme. The driveshaft was inspected and=
rebalanced and the diff was changed to one that has been faultless for year=
s, still had the problem.</span></span></div><div dir=3D"ltr" data-setdir=3D=
"false"><span><span style=3D"color: rgb(0, 0, 0); font-family: "Helveti=
ca Neue", Helvetica, Arial, sans-serif;"><br></span></span></div><div d=
ir=3D"ltr" data-setdir=3D"false"><span><span style=3D"color: rgb(0, 0, 0); f=
ont-family: "Helvetica Neue", Helvetica, Arial, sans-serif;">The o=
nly other thing that has been changed is the clutch master diameter...went o=
ne size smaller as I thought that might give the driver a bit better chance t=
o "modulate" the pedal. The interface twixt the throwout bearing and the thr=
owout bearing flange has been relieved in case it may have gotten hung up so=
mehow on the sleeve. The clearance twixt sleeve and throwout bearing flange i=
s also within specs and moves easily by hand.</span></span></div><div dir=3D=
"ltr" data-setdir=3D"false"><span><span style=3D"color: rgb(0, 0, 0); font-f=
amily: "Helvetica Neue", Helvetica, Arial, sans-serif;"><br></span=
></span></div><div dir=3D"ltr" data-setdir=3D"false"><span><span style=3D"co=
lor: rgb(0, 0, 0); font-family: "Helvetica Neue", Helvetica, Arial=
, sans-serif;">I'm about out of ideas here at this point and I have no confi=
dence that any of these changes will affect the issue. It sure seems like I'=
m missing something here!</span></span></div><div dir=3D"ltr" data-setdir=3D=
"false"><span><span style=3D"color: rgb(0, 0, 0); font-family: "Helveti=
ca Neue", Helvetica, Arial, sans-serif;"><br></span></span></div><div d=
ir=3D"ltr" data-setdir=3D"false"><span><span style=3D"color: rgb(0, 0, 0); f=
ont-family: "Helvetica Neue", Helvetica, Arial, sans-serif;">lack-=
o-slip here in NorCal</span></span></div><div dir=3D"ltr" data-setdir=3D"fal=
se"><span><span style=3D"color: rgb(0, 0, 0); font-family: "Helvetica N=
eue", Helvetica, Arial, sans-serif;">Nick</span></span></div></div><spa=
n>_______________________________________________</span><br><span>fot@autox.=
team.net</span><br><span></span><br><span>http://www.fot-racing.com</span><b=
r><span></span><br><span>Donate: http://www.team.net/donate.html</span><br><=
span>Archive: http://autox.team.net/archive http://www.team.net/pipermail/fo=
t</span><br><span>Unsubscribe/Manage: http://autox.team.net/mailman/options/=
fot/vfracing@aol.com</span><br><span></span><br><span></span><br></div></blo=
ckquote></div></body></html>=
--Apple-Mail-76D785BF-5D57-45F1-80B2-9892F93A9646--
--===============8123020006287152488==
Content-Transfer-Encoding: 7bit
Content-Disposition: inline
_______________________________________________
fot@autox.team.net
http://www.fot-racing.com
Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
--===============8123020006287152488==--
|