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All heavy oil does is make the mixture much richer on acceleration. If
there is no difference with acceleration, then I would go to the lighter
oil because you won't be wasting so much fuel. Seems counterintuitive but
heavy oil acts to make the "accellerator pump" work harder and push more
fuel into the engine on acceleration.
Cheers,
Alan
On Wed, Jun 16, 2021 at 4:54 AM Michael MacLean via Healeys <
healeys@autox.team.net> wrote:
> I watched a recent John Twist YouTube video today on fitting H type SU
> carbs to a T type MG. In the video he says to use 90 wt gear oil in the
> dashpot. He also said the lighter oils and ATF that so many people
> recommend contribute to the early wear and tear on the carb. Anyone else
> using this weight oil in the carb? All my life I have been putting 20 wt
> oil in the dashpot.
> Mike MacLean
>
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<div dir=3D"ltr"><div dir=3D"ltr">All heavy oil does is make the mixture mu=
ch richer on acceleration.=C2=A0 If there is no difference with acceleratio=
n, then I would go to the lighter oil because you won't be wasting so m=
uch fuel.=C2=A0 Seems counterintuitive but heavy oil acts to make the "=
;accellerator=C2=A0pump" work harder and push more fuel into the engin=
e on acceleration.<div><br></div><div>Cheers,</div><div><br></div><div>Alan=
</div><div><br></div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" =
class=3D"gmail_attr">On Wed, Jun 16, 2021 at 4:54 AM Michael MacLean via He=
aleys <<a href=3D"mailto:healeys@autox.team.net";>healeys@autox.team.net<=
/a>> wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0=
px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><=
div dir=3D"ltr">
<div id=3D"gmail-m_2158936493115773648gmail-:1hh"><div dir=3D"ltr"><div>I w=
atched a recent=20
John Twist YouTube video today on fitting H type SU carbs to a T type MG.=
=C2=A0 In=20
the video he says to use 90 wt gear oil in the dashpot.=C2=A0 He also said=
=20
the lighter oils and ATF that so many people recommend contribute to the
early wear and tear on the carb.=C2=A0 Anyone else using this weight oil i=
n=20
the carb?=C2=A0 All my life I have been putting 20 wt oil in the dashpot.=
=C2=A0 <br></div><div>Mike MacLean</div></div></div></div>
</blockquote></div></div>
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