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Hi Phil,
Are those 6mm class 12.9 socket head cap screws? If so, that's
very similar to the powertune venier sprockets for the 6 cylinder engines.
I've used them a few times without issues, although the Goodparts option
with 5/16 bolts is much more confidence inspiring on a race engine.
For the 6mm bolts, I use blue loctite 243, and torque them to about 11
ft-lbs.
Jason Sukey
JS Performance Motoring, LLC
440.984.7720
jason@jsperformancemotoring.com
https://www.facebook.com/JSPerformanceMotoring/
On Mon, Sep 23, 2024 at 8:24=E2=80=AFAM vfracing--- via Fot <fot@autox.team=
.net>
wrote:
> Hi all;
>
> After completely and embarassingly blowing cam timing on two consecutive
> engines i bought from Moss a so-called "vernier" adjustable cam timing
> sprocket made by Powertune. It consists of a hub and sprocket held in
> relative position to each other with 6 Allen head cap screws near the
> periphery of the sprocket. The cap screws have a fancy machined and
> anodized aluminum washer under them to spread the load. (See picture).
>
> My question/concerns are:
>
> Is this robust enough to hold position? Is the friction between hub and
> sprocket sufficient?
>
> Do the aluminum "washers" hold up or do they creep over time, reducing th=
e
> clamping load and allowing it to slip?
>
> Does anyone have a suggestion for the torque spec on the 6 Allen headed
> cap screws (no specs given with the sprocket) or the hub to cam (book say=
s
> 24 - 26 ft lbs).
>
> Should I assemble this Loctite between the hub and sprocket to keep it
> from slipping?
>
> Or should I send this back and get a more robust unit? If so, where can =
I
> get a better one?
>
>
> Thanks!
>
>
> Phil Gott
>
>
> _______________________________________________
> fot@autox.team.net
>
> http://www.fot-racing.com
>
> Donate: http://www.team.net/donate.html
> Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
> Unsubscribe/Manage <http://www.team.net/pipermail/fotUnsubscribe/Manage>:
> http://autox.team.net/mailman/options/fot/jason@jsperformancemotoring.com
>
>
>
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<div dir=3D"ltr">Hi Phil,<div>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Are those =
6mm class 12.9 socket head cap screws?=C2=A0 If so, that's very similar=
to the powertune venier sprockets for the 6 cylinder engines.=C2=A0 I'=
ve used them a=C2=A0few times without issues, although the Goodparts option=
with 5/16 bolts is much more confidence inspiring on a race engine.</div><=
div>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0</div><div>For the 6mm bolts, I use b=
lue loctite 243, and torque them to about 11 ft-lbs.</div><div><br></div><d=
iv><br></div><div><br clear=3D"all"><div><div dir=3D"ltr" class=3D"gmail_si=
gnature" data-smartmail=3D"gmail_signature"><div dir=3D"ltr"><div><div dir=
=3D"ltr"><div><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div>Jason=
Sukey</div><div><span></span><span></span>JS Performance Motoring, LLC<br>=
</div><div>440.984.7720</div><div><a href=3D"mailto:jason@jsperformancemoto=
ring.com" target=3D"_blank">jason@jsperformancemotoring.com</a><br></div><d=
iv><a href=3D"https://www.facebook.com/JSPerformanceMotoring/"; target=3D"_b=
lank">https://www.facebook.com/JSPerformanceMotoring/</a><br></div></div></=
div></div></div></div></div></div></div></div><br></div></div><br><div clas=
s=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Mon, Sep 23, 202=
4 at 8:24=E2=80=AFAM vfracing--- via Fot <<a href=3D"mailto:fot@autox.te=
am.net">fot@autox.team.net</a>> wrote:<br></div><blockquote class=3D"gma=
il_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,2=
04,204);padding-left:1ex"><div><div style=3D"font-family:arial;font-size:16=
px"><div dir=3D"ltr">Hi all;</div><div dir=3D"ltr"><br></div><div dir=3D"lt=
r">After completely and embarassingly blowing cam timing on two consecutive=
engines i bought from Moss a so-called "vernier" adjustable cam =
timing sprocket made by Powertune.=C2=A0 It consists of a hub and sprocket =
held in relative position to each other with 6 Allen head cap screws near t=
he periphery of the sprocket.=C2=A0 The cap screws have a fancy machined an=
d anodized aluminum washer under them to spread the load. (See picture).</d=
iv><div dir=3D"ltr"><br></div><div dir=3D"ltr">My question/concerns are:</d=
iv><div dir=3D"ltr"><br></div><blockquote style=3D"margin:0px 0px 0px 40px;=
border:none;padding:0px"><div dir=3D"ltr">Is this robust enough to hold pos=
ition?=C2=A0 Is the friction between hub and sprocket sufficient? =C2=A0</d=
iv><div dir=3D"ltr"><br></div><div dir=3D"ltr">Do the aluminum "washer=
s" hold up or do they creep over time, reducing the clamping load and =
allowing it to slip?</div><div dir=3D"ltr"><br></div><div dir=3D"ltr">Does =
anyone have a suggestion for the torque spec on the 6 Allen headed cap scre=
ws (no specs given with the sprocket) or the hub to cam (book says 24 - 26 =
ft lbs).</div><div dir=3D"ltr"><br></div><div dir=3D"ltr">Should I assemble=
this Loctite between the hub and sprocket to keep it from slipping?</div><=
div dir=3D"ltr"><br></div><div dir=3D"ltr">Or should I send this back and g=
et a more robust unit?=C2=A0 If so, where can I get a better one?</div></bl=
ockquote><div dir=3D"ltr"><br></div><div dir=3D"ltr">Thanks!</div><div dir=
=3D"ltr"><br></div><div dir=3D"ltr"><br></div><div dir=3D"ltr">Phil Gott</d=
iv><div dir=3D"ltr"><br></div><div dir=3D"ltr"><br></div></div></div>______=
_________________________________________<br>
<a href=3D"mailto:fot@autox.team.net"; target=3D"_blank">fot@autox.team.net<=
/a><br>
<br>
<a href=3D"http://www.fot-racing.com"; rel=3D"noreferrer" target=3D"_blank">=
http://www.fot-racing.com</a><br>
<br>
et=3D"_blank">http://www.team.net/donate.html</a><br>
Archive: <a href=3D"http://autox.team.net/archive"; rel=3D"noreferrer" targe=
t=3D"_blank">http://autox.team.net/archive</a> <a href=3D"http://www.team.n=
et/pipermail/fotUnsubscribe/Manage" rel=3D"noreferrer" target=3D"_blank">ht=
tp://www.team.net/pipermail/fot<br>
t/jason@jsperformancemotoring.com" rel=3D"noreferrer" target=3D"_blank">htt=
p://autox.team.net/mailman/options/fot/jason@jsperformancemotoring.com</a><=
br>
<br>
<br>
</blockquote></div>
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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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