I assume that the Morgan owners all have wire wheels? Accelerating,
although it may seem counterintuitive, actually makes sense. Decelerating
may/probably/will have the same effect. I will bet that the vibration is set
up at 55
- 60 mph and goes away as you accelerate through that. This is a very
common malady and can, and does, occur with steel wheels as well. This can be
trued and balanced out. This is a "harmonic" set up at that rotational speed.
Wouldn't you think that it would get worse as the rotational speed increases?
For the most part it doesn't. I have had it at 55 - 60 but the car settles
down as I approach 70 -80-90 mph. The annoying part is that you drive most
of the time at 55 - 60. I have allowed myself some "wiggle room" in my
statements because sometimes the wheel is so far out that it does not conform
to
what I have said here.
I am by no means an officianado on Morgans, in fact know very little about
them. What I recommend is that you call Alan Hendrix at Hendrix Wire Wheel.
NFI. He talks for free. He trues and balances for cash. He can help you
understand this phenomenon, as he did with me.
He may confirm that Morgan has an inherent flaw that causes wheel shimmy,
but I were a betting man I would bet not. I may lose!
David Lylis
69 TR6 CC26160L
60 TR3A TS74461LO
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