[Fot] Harmonic Damper Question

[Bill Babcock]

What do you have to lose trying it? I might not put an expensive  
dampener on it perhaps, just a decent one, but it's likely that your  
crank is fine.
On Apr 9, 2009, at 3:50 AM, Robert Lang 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!
> Voice:781-438-2568    FAX: 617-258-9535        |  Cell: 339-927-4489
> ---------------------------------------------------------------------------
> _______________________________________________
> Support Team.Net http://www.team.net/donate.html
>
> http://www.fot-racing.com
>
> Fot mailing list
> Fot at autox.team.net
> http://autox.team.net/mailman/listinfo/fot
>

Bill Babcock
Babcock & Jenkins
Billb at bnj.com
503.936.7660
www.bnj.com

Editor
Ke Nalu e-Magazine
Paddlesurfing's Web Journal

Bill at kenalu.com
www.kenalu.com
blog: www.ponohouse.com/ponoblog