Re: [Healeys] Resonance at 2900 rpm

[i erbs <eyera3000@gmail.com>]

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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@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@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@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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<div dir=3D"auto"><br>The engine was balanced when I rebuilt it. Replaced t=
he flywheel to accommodate a late model clutch cover, but did not balance t=
he new flywheel.<div dir=3D"auto">How do you check a harmonic balance?<br><=
div data-smartmail=3D"gmail_signature" dir=3D"auto">Ira Erbs<br>1959 AH 100=
-6<br>1967 MGB<br>Milwaukie, OR</div></div></div><br><div class=3D"gmail_qu=
ote"><div dir=3D"ltr" class=3D"gmail_attr">On Sun, May 2, 2021, 3:51 PM Mic=
hael Salter &lt;<a href=3D"mailto:michaelsalter@gmail.com";>michaelsalter@gm=
ail.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"=
margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir=3D"=
auto"><span style=3D"font-family:sans-serif;font-size:12.8px">&quot;Yes on =
engine&quot;.</span><div dir=3D"auto"><span style=3D"font-family:sans-serif=
;font-size:12.8px">Well to be honest that opens a whole can of worms.=C2=A0=
</span></div><div dir=3D"auto"><span style=3D"font-family:sans-serif;font-s=
ize:12.8px">Engine balance would certainly be the first suspicion and that =
involves a total rebuild.</span></div><div dir=3D"auto"><span style=3D"font=
-family:sans-serif;font-size:12.8px">Sometimes an exhaust system can develo=
p a &quot;resonance &quot; which if caused by a muffler will usually result=
 in it cracking eventually.=C2=A0</span></div><div dir=3D"auto"><span style=
=3D"font-family:sans-serif;font-size:12.8px">I&#39;ve encountered various o=
ther sources=C2=A0 ...=C2=A0</span></div><div dir=3D"auto"><span style=3D"f=
ont-family:sans-serif;font-size:12.8px">Badly balanced and mounted alternat=
or.</span></div><div dir=3D"auto"><span style=3D"font-family:sans-serif;fon=
t-size:12.8px">Disintegrating front balancer</span></div><div dir=3D"auto">=
<span style=3D"font-family:sans-serif;font-size:12.8px">=C2=A0&amp; Loose f=
lywheel</span></div><div dir=3D"auto"><span style=3D"font-family:sans-serif=
;font-size:12.8px">Come to mind.</span></div><div dir=3D"auto"><span style=
=3D"font-family:sans-serif;font-size:12.8px"><br></span></div><div dir=3D"a=
uto"><span style=3D"font-family:sans-serif;font-size:12.8px">Time for some =
diagnosis.</span></div><div dir=3D"auto"><span style=3D"font-family:sans-se=
rif;font-size:12.8px"><br></span></div><div dir=3D"auto"><span style=3D"fon=
t-family:sans-serif;font-size:12.8px">M</span></div><div dir=3D"auto"><span=
 style=3D"font-family:sans-serif;font-size:12.8px"><br></span></div></div><=
br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Sun.=
, May 2, 2021, 6:38 p.m. i erbs, &lt;<a href=3D"mailto:eyera3000@gmail.com"=
 target=3D"_blank" rel=3D"noreferrer">eyera3000@gmail.com</a>&gt; wrote:<br=
></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-=
left:1px #ccc solid;padding-left:1ex"><div dir=3D"auto">Yes on engine.<div =
dir=3D"auto">Yes to switching flywheel to BJ8 and special disk for toyota=
=C2=A0<br><br><div data-smartmail=3D"gmail_signature" dir=3D"auto">Ira Erbs=
<br>1959 AH 100-6<br>1967 MGB<br>Milwaukie, OR</div></div></div><br><div cl=
ass=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Sun, May 2, 20=
21, 11:18 AM Bob Spidell &lt;<a href=3D"mailto:bspidell@comcast.net"; rel=3D=
"noreferrer noreferrer" target=3D"_blank">bspidell@comcast.net</a>&gt; wrot=
e:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;bo=
rder-left:1px #ccc solid;padding-left:1ex">Did you have your engine balance=
d at rebuild? If you did, have you <br>
changed out the clutch or flywheel since?<br>
<br>
On 5/2/2021 11:01 AM, i erbs via Healeys wrote:<br>
&gt; Howdy all,<br>
&gt; Been driving my car a lot lately and I&#39;ve been reminded that I get=
 <br>
&gt; some load resonance between 2800 and 2900 rpm, in any gear. Have <br>
&gt; Smitty 5 speed.<br>
&gt; Any ideas?<br>
&gt;<br>
&gt; Ira Erbs<br>
&gt; 1959 AH 100-6<br>
&gt; 1967 MGB<br>
&gt; Milwaukie, OR<br>
&gt;<br>
<br>
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