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Roger--
I remember reading of someone whose damper chambers somehow became
pressurized resulting in the dampers' blowing out of the carb domes and
denting his hood from underneath. I have no recollection of what the
underlying cause was, but since the carb domes are vented is it possible
that the oil is somehow escaping via the vent holes?
Best--Michael Oritt
On Tue, Jun 15, 2021 at 12:54 PM Roger Grace via Healeys <
healeys@autox.team.net> wrote:
> For the SU experts ..
> Have posted about this problem before - and no, it has not gone away.
> Bought new (not rebuilt) HD8 carbs from SU/Burlen about 7k miles ago.
> Problem is excessive use of damper oil.
> Have to top up about every 1.5 tanks of gas usage.
> Ultra careful about filling properly and to feel resistance about 1/2 in
> above the thread.
> Have tried all grades of oil from 20 wt to thick gear oil with no change
> apart from accel. response times. Currently using SAE 30 nd.
> SU have no real ideas either.
> They are encouraging me to purchase new dampers - pn AUC 8112HB ... pricey
> too.
> I am not convinced that will solve it but will do so.
> There is some very minor scuffing on the valves. See photo.
> The pistons drop freely and there is the classic clunk when raised 1/8 in.
> Perhaps this is normal ? maybe other owners don't check their dashpots as
> frequently ? heavier springs to limit movement ?
> any ideas as to what gives most welcome ?
> rg
>
>
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--
Best--Michael
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Content-Transfer-Encoding: quoted-printable
<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"color:#3333ff">Roger=
--</div><div class=3D"gmail_default" style=3D"color:#3333ff"><br></div><div=
class=3D"gmail_default" style=3D"color:#3333ff">I remember reading of some=
one whose=C2=A0damper chambers somehow became pressurized resulting in the =
dampers' blowing out of the carb domes and denting his hood from undern=
eath.=C2=A0 I have no recollection of what the underlying cause was, but si=
nce the carb domes are vented is it possible that the oil is somehow escapi=
ng via the vent holes?</div><div class=3D"gmail_default" style=3D"color:#33=
33ff"><br></div><div class=3D"gmail_default" style=3D"color:#3333ff">Best--=
Michael Oritt</div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" cl=
ass=3D"gmail_attr">On Tue, Jun 15, 2021 at 12:54 PM Roger Grace via Healeys=
<<a href=3D"mailto:healeys@autox.team.net"; target=3D"_blank">healeys@au=
tox.team.net</a>> wrote:<br></div><blockquote class=3D"gmail_quote" styl=
e=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);paddin=
g-left:1ex"><div dir=3D"ltr"><div>For the SU experts ..<br></div><div>Have =
posted about this problem before=C2=A0 - and no, it has not gone away.</div=
><div>Bought new (not rebuilt) HD8 carbs from SU/Burlen about 7k miles ago.=
</div><div>Problem is excessive use of damper oil.</div><div>Have to top up=
about every 1.5 tanks of gas usage.</div><div>Ultra careful about filling =
properly and to feel resistance about 1/2 in above the thread.</div><div>Ha=
ve tried all grades of oil from 20 wt to thick gear oil with no change apar=
t from accel. response times. Currently using SAE 30 nd.</div><div>SU have =
no real ideas either.</div><div>They are encouraging me to purchase new dam=
pers - pn=20
AUC 8112HB ... pricey too.<br></div><div>I am not convinced that will solve=
it but will do so.<br></div><div>There is some very minor scuffing on the =
valves. See photo.</div><div>The pistons drop freely and there is the class=
ic clunk when raised 1/8 in.<br></div><div>Perhaps this is normal ? maybe o=
ther owners don't check their dashpots as frequently ? heavier springs =
to limit movement ?<br></div><div>any ideas as to what gives most welcome ?=
</div><div>rg<br></div><div><br></div><div><br></div></div>
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<br>
</blockquote></div><br clear=3D"all"><div><br></div>-- <br><div dir=3D"ltr"=
><font color=3D"#3333ff">Best--Michael</font></div>
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