[Fot] "Vernier" Adjustable Cam Sprocket

[John Styduhar]

Mock it up and check for interference between those bolt heads and the
inside of the timing chain cover.

On Mon, Sep 23, 2024 at 11:08 AM fubog1 via Fot <fot at autox.team.net> wrote:

> Yes torque the hub to the cam to spec, using proper shouldered bolts, &
> cinch the screws up good w/a dab of blue loctite, they work fine.
>
> Glen Efinger
>
> On Monday, September 23, 2024 at 09:07:22 AM EDT, Erik Jacobsen via Fot <
> fot at autox.team.net> wrote:
>
>
> Phil,
> My two cents (no cash value [image: Emoji]). I have used vernier
> sprockets on my TR3, my wife's TR6 and my Bugeye race cars, and haven't had
> any issues. I don't torque them to a specific number since mine are all
> aluminum, but I do Loctite blue the screws. Have never had any slipping or
> wear issues. And the ability to get the cam timing just right is awfully
> nice, especially on the 3 as it's so critical.
>
> Cheers,
> Jake
>
> On Monday, September 23, 2024 at 07:21:34 AM CDT, 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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