[Fot] "Vernier" Adjustable Cam Sprocket

[JS Performance Motoring, LLC]

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 at jsperformancemotoring.com
https://www.facebook.com/JSPerformanceMotoring/


On Mon, Sep 23, 2024 at 8:24 AM vfracing--- via Fot <fot at 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 the
> 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 says
> 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
>
>
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