[Healeys] FW: Dashpot OIl Wt

Wed Jun 16 16:19:39 MDT 2021

Many, many moons ago (around 1963 or so, I was 16 and not really very 
Healey wise), my 54, 100-4 was actually being driven daily and not 
buried away in the back corner of the race barn/garage like it is 
today.  I usually used what ever oil was left over in the can (yes, can 
back then it was in a can, from oil changes, generally from my Modified 
Race Car.  What weight , you say?   It was straight 50 Weight, 
non-detergent, Oilzum.  The car ran well with no ill effects 
what-so-ever.  The carbs were adjusted using a length of fuel line to 
listen for proper synchronization (I certainty didn't have a fancy 
synchronization tool or for that matter the extra money to buy one.

_bill

------------------------------------------------------------------------

On 6/16/2021 7:56 AM, Patrick & Caroline Quinn via Healeys wrote:
>
> G’day
>
> As a matter of interest, the SUs fitted to our 1948 Healey Saloon are 
> not fitted with rods at all.
>
> The caps are made from black Bakelite and I use dashpot oil sold by SU.
>
> Hoo Roo
>
> Patrick Quinn
>
> Blue Mountains, Australia
>
> *From:*Healeys [mailto:healeys-bounces at autox.team.net] *On Behalf Of 
> *Michael Salter
> *Sent:* Wednesday, 16 June 2021 8:46 AM
> *To:* Harold Manifold
> *Cc:* Ahealey help
> *Subject:* Re: [Healeys] Dashpot OIl Wt
>
> 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 <mailto: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 <mailto:healeys at autox.team.net>
>     *Sent: *Tuesday, June 15, 2021 2:20 PM
>     *To: *Michael MacLean <mailto:springer.mike51 at gmail.com>; Ahealey
>     help <mailto: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 <http://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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