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Joe, see notes interspersed into your text below...
Pile -O-Parts Collection of TR Parts...I resemble your remarks, Jack
Wheeler.
On to a diagnosis of drive line vibration in IRS TR4A w/OD, if I may
solicit
some help from the FOT. Important!!!!
Subject Car: TR4A 1965 IRS with OD.
Operating Conditions: Long distance high speed driving for extended
periods.
Symptoms: Vibration (which seems to be RPM related) at about 3000 RPM at
each
shift point and during cruise.
Discussion: Seems to be a long term problem...before I became familiar
with
the car.
*Overdrive unit replaced in recent years with rebuilt unit. Not known if
condition was there before.
[Jack Wheeler]
The TR-4A's used a heavy weight strapped around the tailshaft of the
transmission. I was never sure what it was for, but I always suspected it
had something to do with vibration. Does he have one of these on the car?
If not, wouldn't hurt to put one on and see if it makes a difference.
*U-Joints replaced on 'regular basis'...this car is accumulating
substantial
miles.
*Not known if driveshaft is "out of phase" or even if TR is sensitive to
same.
[Jack Wheeler]
I always made sure my driveshafts were balanced on the race car. Early on,
I had a high speed engine miss, which seemed to correlate with a high speed
vibration. An engineer friend, and fellow TR-4 racer (Jeff Getchell)
suggested I have the driveshaft balanced. I did, and suddenly, both the
high speed miss and the vibration went away. We think the vibration was
upsetting the float levels, and affecting fuel flow to the engine.
*Condition of engine and driveline mounts unknown.
[Jack Wheeler]
I had a rear mount break one time during a race. It was pretty noticeable
though, as the shift lever would noticeably slide from side to side as I
went around corners.
Hope some of this helps......... Good Luck!
*Total restoration in recent years...Nut & Bolt frame off.
Effect: Driveline is fairly smooth, but not necessarily 'good' at below
3,000
RPM (indicated). Smooths out again at 3400 RPM (indicated) or better. A bit
too fast for most roads in overdrive.
This car will continue to be driven for long distances...likely another
10,000 miles yet this year. And more in years to come....knowing the owner.
He deserves better.
FOT? Jack Wheeler?....of course you know this driveline. Have any
suggestions? Anyone else?
(I had a 1966 TR4A IRS that I remember running to 108 MPH (non-OD) without
this vibration and it spent most of it's life with a bit of squat to rear
due
to sagging springs)
There is a 4,000 to 5,000 mile trip planned this Fall in this car. Enuff
said
here.
Regards & Thanks,
Joe Alexander
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