[Healeys] Dashpot OIl Wt

[Michael Salter]

On later SUs with plastic caps a carb backfire will send the rod up through
the cap if too heavy an oil is used.

M

On Tue., Jun. 15, 2021, 6:42 p.m. Harold Manifold via Healeys, <
healeys at autox.team.net> wrote:

> I checked two versions of the Healy Workshop Manual:
>
>
>
> Issue 2 – 20W/20 or 20W/30
>
> Issue 9 – 10W/30 or 10W/40
>
>
>
> Both manuals have this statement “In no circumstances should a
> heavy-bodied lubricant be used”. The oil is to act as a damper and reduce
> the pistons in the carburetor from fluttering. Once the temperature gets
> above about 40 deg C the viscosity is very similar for all of the
> lubricants mentioned. Note 75W/90 gear oil is very close to 15W/40 motor
> oil. Straight 90 is probably not a good choice as it will be heavy-bodied
> at lower temperatures.
>
>
>
> The manuals suggest the lightest oil that will control piston flutter is
> the right one.
>
>
>
> Harold
>
>
>
> *From: *David Nock BCS via Healeys <healeys at autox.team.net>
> *Sent: *Tuesday, June 15, 2021 2:20 PM
> *To: *Michael MacLean <springer.mike51 at gmail.com>; Ahealey help
> <healeys at autox.team.net>
> *Subject: *Re: [Healeys] Dashpot OIl Wt
>
>
>
> We have used 20 / 50 straight from an oil can on the bench for 40 years
> and never had a problem.
>
>
>
>
>
> David Nock
> British Car Specialists
> 209-948-8767
> www.britishcarspecialists.com
>
>
>
>
>
> *From:* Michael MacLean via Healeys
>
> *Sent:* Tuesday, June 15, 2021 1:18 PM
>
> *To:* Ahealey help
>
> *Subject:* [Healeys] Dashpot OIl Wt
>
>
>
> 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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