[Fot] Beaten by equipment

Mon Sep 15 19:23:49 MDT 2008

A friend of mine had an odd vib, on a whim he swapped the drums and  
yeah it went away.

A.

On 15-Sep-08, at 9:20 PM, JHOUATHOME at aol.com wrote:

> Greg,
> My TR4 used to have a similar mystery vibration, which in the end,  
> after much frustrating searching over many events, turned out to be  
> an out of balance rear brake drum.  Stupid, I know.  I had also been  
> through several attempts to balance wheels, replace wheels, and  
> balance everything else, and simply never thought of those old iron  
> drums.  I swapped them out and never had the problem again.  The  
> strangest thing about it was that the problem seemed to be  
> intermittent, and would crop-up with no pattern that I could figure  
> out.  In the end, that was it though.  Upon more careful  
> consideration I realized that it was only happening at Road America,  
> the Glen, and BIR, all pretty fast places.  I was delighted to  
> figure it out.  Hope this is your problem, and not something more  
> expensive!
>
> Good Luck,
> John Houlton
>
> In a message dated 9/15/2008 7:57:35 P.M. Central Daylight Time, lunkercars at earthlink.net 
>  writes:
> Hello all,
> Beaten by equipment...
> My previous posting from Brainard quoted the common wisdom "you
> gotta' finish to win". Well, I was reminded that you gotta' start to
> finish. Sunday at Brainard shaped up to be what I would call "ideal
> conditions"... cold, wet and basically miserable enough that only
> fools/idiots/& the die-hards like me [3 in 1] would dare go out -
> perfect. Not sure if excessive oil pressure from the 40ish temp on my
> 20W50 caused it [doubtful] or if it was just it's time, but upon
> startup for the sunday race the oil cooler chose to rupture in the
> pits and that was the end of that. Could have by-passed it for the
> next race but it was canceled due to conditions too perfect for me to
> even imagine. Oh well - finding out that the top 4 finishers behind
> me on saturday are all ice racers boosted my ego enough and knowing
> that they were all gunning for me might not have made sunday quite as
> enjoyable as saturday.
> Interesting to note that that although I do buy better that 50% of my
> perts from Moss, 100% of my failures have been from parts they have
> supplied. Once again, my cheepo nature has proven to be false
> economy  and bitten me in the butt.
> Now on to good vibrations and bad vibrations. The Beach Boys told us
> about the good ones but some aren't and never will be. First time I
> ever felt the bad one was at Watkins Glen. It may well have existed
> before but my car has never been on a track that fast. So far as my
> butt and brain can tell, it doesn't come on until somewhere beyond
> 100mph. After getting the driveshaft straightened last week I thought
> I had surely got to the problem. First couple sessions at Brainard
> felt good but that proved to be a combination of wishful thinking and
> not going fast enough. It's still there. For a time at The Glen and
> again at Brainard I almost convinced myself that it was 4th gear only
> but I am now pretty sure that it is only dependent on road speed -
> i.e., it's felt near redline in 3rd and only gets worse as 4th
> progresses. Scared the speed right out of me the first time I felt it
> come on, but after many teeth grinding laps with nothing coming thru
> the block [convinced it's not engine related], the trans. case, or
> thru the floor, I've lived with it thru the last two races. Doesn't
> mean I like it and that combined with a bum oil cooler, moody starter
> [thanks again Moss Motors] and exorbitant entry fees, will likely
> keep me from going to Road America.
> Any Ideas? The drive-shaft straightening didn't seem to do anything.
> I've run it on 3 different sets of tires and wheels, so that's not
> it. U-joints are fine [by all appearances], can't find any slop in
> the trans. output shaft or the diff, input [pinion] shaft nor any run-
> out  on the input shaft flange or axles. Defiantly not coming from
> the front as it is not transmitted thru the steering wheel. Rear axle
> bearings seem to be in fine shape.
> The engine is fresh and in good balance. The trans. is new to me
> [close ratio in a TR6 case] but no recognized problems from the
> previous FoT owner. I have given the original, stock, open. 3.70
> differential a hard life since it's early retirement but I still
> can't see how that would figure in. The only unknown is my frozen
> axle shafts... As part of my recent "freshening", I sent the crank
> shaft [more on that later], stub axles, front hubs, rear hubs and
> half shafts  to Controlled Thermal Processing [http://metal-wear.com]
> to be cryogenically frozen [-300f/+300f in a 68 hour process].  Being
> unknown voodoo, I'm creating a scenario where the axle[s] have a bow
> in it [them] causing a imbalance, causing the vibration but not
> detectable from the flange end - not very likely but I'm grasping at
> straws here [oh yea, I'm still in the mid-west so it must be corn].
> Please believe me, at this point I am willing to consider any ideas
> regardless how far fetched. And maybe one [some] of you know what I'm
> feeling and have the spot-on answer.
>
> Greg "Lunker" Hilyer
> TR4 #314
> Albuquerque NM
>
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--
Andre Rousseau - andre at gt6.ca
'68 Triumph GT6 MK1 - http://www.gt6.ca/
Ottawa, ON, Canada

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