[Fot] Harmonic Damper Question

[Chuck Arnold]

The good news about the ATI dampner is you measure your snout and they make
the piece that goes on  it to "fit".  Fit means a little under so you have
to warm it before you can press it on.

On Thu, Apr 9, 2009 at 6:50 AM, Robert Lang <lang at isis.mit.edu> wrote:

> Hi,
>
> I installed a crank fan eliminator on my race car last year if for no other
> reason than it looked kool. It also dropped some weight, maybe 1 lb. And
> $30. :-) BTW - the guy that made this part is an awesome Triumph dude in
> Maine - Rick Patton. He's getting 200 HP to the wheels on a supercharged /
> injected TR6 motor with mostly stock internals!
>
> At any rate, I installed the eliminator and after a few events where the
> motor saw fairly big RPMs, the motor developed a rattle that you could only
> hear at idle. Along with FOT 19to1TR6, we determined that the harmonic
> damper had worked loose. I actually expected that to be the source of the
> noise, but I was more expecting the two damper rings to have seperated.
>
> The guy that made the parts looked at the part design and my installation
> and we determined that the back cut on the eliminator was not deep enough
> for my installation and this allowed the stock damper to wiggle a bit in the
> radial direction. Eventually, the crank key got worked over a bit and the
> slot in the dampener got egged out a bit.
>
> Here's the question: if a damper works loose, is it a given that the crank
> snout is damaged? I put a mic on the crank and I get uniform dimensions, but
> as of this moment I don't have another crank pulley to install to do some
> measuring. I'm teetering on the edge of picking up a fancy race dampener (I
> know all the advantages, I'm weighing a new dampener vs. being able to
> "afford" the trip to Nationals this year).
>
> So - the second question is - if the crank is knackered, is it a given that
> I'll wreck whatever dampener I install on that crank?
>
> I hope this is clear in description. I sort of think the answer is a no
> brainer (meaning that the crank is probably not optimal any more and that
> installing a new dampener is probably not the best solution), but I'm trying
> not to have to build a new bottom end on the motor at this time.
>
> Guidance, please?
> rml
> ---------------------------------------------------------------------------
> Bob Lang              NER/SCCA                 |  This space for rent
> Solo Chair 2008       TR6 40 F Prepared        |  Triumph!
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-- 
Chuck Arnold