[Healeys] Resonance at 2900 rpm

[i erbs]

The engine was balanced when I rebuilt it. Replaced the flywheel to
accommodate a late model clutch cover, but did not balance the new flywheel.
How do you check a harmonic balance?
Ira Erbs
1959 AH 100-6
1967 MGB
Milwaukie, OR

On Sun, May 2, 2021, 3:51 PM Michael Salter <michaelsalter at gmail.com> wrote:

> "Yes on engine".
> Well to be honest that opens a whole can of worms.
> Engine balance would certainly be the first suspicion and that involves a
> total rebuild.
> Sometimes an exhaust system can develop a "resonance " which if caused by
> a muffler will usually result in it cracking eventually.
> I've encountered various other sources  ...
> Badly balanced and mounted alternator.
> Disintegrating front balancer
>  & Loose flywheel
> Come to mind.
>
> Time for some diagnosis.
>
> M
>
>
> On Sun., May 2, 2021, 6:38 p.m. i erbs, <eyera3000 at gmail.com> wrote:
>
>> Yes on engine.
>> Yes to switching flywheel to BJ8 and special disk for toyota
>>
>> Ira Erbs
>> 1959 AH 100-6
>> 1967 MGB
>> Milwaukie, OR
>>
>> On Sun, May 2, 2021, 11:18 AM Bob Spidell <bspidell at comcast.net> wrote:
>>
>>> Did you have your engine balanced at rebuild? If you did, have you
>>> changed out the clutch or flywheel since?
>>>
>>> On 5/2/2021 11:01 AM, i erbs via Healeys wrote:
>>> > Howdy all,
>>> > Been driving my car a lot lately and I've been reminded that I get
>>> > some load resonance between 2800 and 2900 rpm, in any gear. Have
>>> > Smitty 5 speed.
>>> > Any ideas?
>>> >
>>> > Ira Erbs
>>> > 1959 AH 100-6
>>> > 1967 MGB
>>> > Milwaukie, OR
>>> >
>>>
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