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<DIV>Greg, </DIV>
<DIV>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!</DIV>
<DIV> </DIV>
<DIV>Good Luck,</DIV>
<DIV>John Houlton</DIV>
<DIV> </DIV>
<DIV>
<DIV>In a message dated 9/15/2008 7:57:35 P.M. Central Daylight Time,
lunkercars@earthlink.net writes:</DIV>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"><FONT
style="BACKGROUND-COLOR: transparent" face=Arial color=#000000 size=2>Hello
all,<BR>Beaten by equipment...<BR>My previous posting from Brainard quoted the
common wisdom "you <BR>gotta' finish to win". Well, I was reminded that
you gotta' start to <BR>finish. Sunday at Brainard shaped up to be what
I would call "ideal <BR>conditions"... cold, wet and basically miserable
enough that only <BR>fools/idiots/& the die-hards like me [3 in 1]
would dare go out - <BR>perfect. Not sure if excessive oil pressure from
the 40ish temp on my <BR>20W50 caused it [doubtful] or if it was just
it's time, but upon <BR>startup for the sunday race the oil cooler chose
to rupture in the <BR>pits and that was the end of that. Could have
by-passed it for the <BR>next race but it was canceled due to conditions
too perfect for me to <BR>even imagine. Oh well - finding out that the
top 4 finishers behind <BR>me on saturday are all ice racers boosted my
ego enough and knowing <BR>that they were all gunning for me might not
have made sunday quite as <BR>enjoyable as saturday.<BR>Interesting to
note that that although I do buy better that 50% of my <BR>perts from
Moss, 100% of my failures have been from parts they have <BR>supplied.
Once again, my cheepo nature has proven to be false <BR>economy
and bitten me in the butt.<BR>Now on to good vibrations and bad vibrations.
The Beach Boys told us <BR>about the good ones but some aren't and never
will be. First time I <BR>ever felt the bad one was at Watkins Glen. It
may well have existed <BR>before but my car has never been on a track
that fast. So far as my <BR>butt and brain can tell, it doesn't come on
until somewhere beyond <BR>100mph. After getting the driveshaft
straightened last week I thought <BR>I had surely got to the problem.
First couple sessions at Brainard <BR>felt good but that proved to be a
combination of wishful thinking and <BR>not going fast enough. It's
still there. For a time at The Glen and <BR>again at Brainard I almost
convinced myself that it was 4th gear only <BR>but I am now pretty sure
that it is only dependent on road speed - <BR>i.e., it's felt near
redline in 3rd and only gets worse as 4th <BR>progresses. Scared the
speed right out of me the first time I felt it <BR>come on, but after
many teeth grinding laps with nothing coming thru <BR>the block
[convinced it's not engine related], the trans. case, or <BR>thru the
floor, I've lived with it thru the last two races. Doesn't <BR>mean I
like it and that combined with a bum oil cooler, moody starter
<BR>[thanks again Moss Motors] and exorbitant entry fees, will likely
<BR>keep me from going to Road America.<BR>Any Ideas? The drive-shaft
straightening didn't seem to do anything. <BR>I've run it on 3 different
sets of tires and wheels, so that's not <BR>it. U-joints are fine [by
all appearances], can't find any slop in <BR>the trans. output shaft or
the diff, input [pinion] shaft nor any run- <BR>out on the input shaft
flange or axles. Defiantly not coming from <BR>the front as it is not
transmitted thru the steering wheel. Rear axle <BR>bearings seem to be
in fine shape.<BR>The engine is fresh and in good balance. The trans. is new
to me <BR>[close ratio in a TR6 case] but no recognized problems from
the <BR>previous FoT owner. I have given the original, stock, open.
3.70 <BR>differential a hard life since it's early retirement but I
still <BR>can't see how that would figure in. The only unknown is my
frozen <BR>axle shafts... As part of my recent "freshening", I sent the
crank <BR>shaft [more on that later], stub axles, front hubs, rear hubs
and <BR>half shafts to Controlled Thermal Processing
[http://metal-wear.com] <BR>to be cryogenically frozen [-300f/+300f in a
68 hour process]. Being <BR>unknown voodoo, I'm creating a
scenario where the axle[s] have a bow <BR>in it [them] causing a
imbalance, causing the vibration but not <BR>detectable from the flange
end - not very likely but I'm grasping at <BR>straws here [oh yea, I'm
still in the mid-west so it must be corn].<BR>Please believe me, at this point
I am willing to consider any ideas <BR>regardless how far fetched. And
maybe one [some] of you know what I'm <BR>feeling and have the spot-on
answer.<BR><BR>Greg "Lunker" Hilyer<BR>TR4 #314<BR>Albuquerque NM <BR>
<BR>_______________________________________________<BR>http://www.team.net/donate.html<BR><BR>Fot
mailing
list<BR>Fot@autox.team.net<BR>http://autox.team.net/mailman/listinfo/fot<BR><BR></FONT></BLOCKQUOTE></DIV></FONT><BR><BR><BR><DIV><FONT style="color: black; font: normal 10pt ARIAL, SAN-SERIF;"><HR style="MARGIN-TOP: 10px">Psssst...Have you heard the news? <A title="http://www.stylelist.com/trends?ncid=aolsty00050000000014" href="http://www.stylelist.com/trends?ncid=aolsty00050000000014" target="_blank">There's a new fashion blog, plus the latest fall trends and hair styles at StyleList.com</A>.</FONT></DIV></BODY></HTML>