[Fot] "Vernier" Adjustable Cam Sprocket

[Mike Harmuth]

Phil, I use one from Rimmer Bros (now part of Moss) that's all metal.

Here's the current TR version, made by Kent
https://rimmerbros.com/Item--i-145870URK

This is the one on the Spit, installed and running for a few years now. My
machine shop guy likes it.
[image: IMG_20190716_141429.jpg]

On Mon, Sep 23, 2024 at 8:33 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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