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Re: [Spridgets] SU question for racer types...

To: spridgets@autox.team.net, Mark Haynes <haynes386@netzero.net>
Subject: Re: [Spridgets] SU question for racer types...
From: Michael MacLean <rrengineer.mike@att.net>
Date: Fri, 12 Nov 2010 15:13:06 -0800 (PST)
I still have the Healey intake manifold with the HS2 carbs that have the
throats augered out for sale if anyone is interested.  Thia setup was used by
a local racer back in the 60s. I don't know where he bought the Healey marked
intake manifolds. Pics available upon request.  Oh, the dampers are in place.
Mike MacLean
60 Sprite
56 BN2

--- On Fri, 11/12/10, Mark Haynes <haynes386@netzero.net> wrote:

From: Mark Haynes <haynes386@netzero.net>
Subject: Re: [Spridgets] SU question for racer types...
To: spridgets@autox.team.net
Date: Friday, November 12, 2010, 8:35 PM

When we first bought the Spit racer, the HS2s on it were in this condition.
After talking with some of the Sprite/Spit racers, the conclusion that we
to was this- The dashpot dampers had been removed to 'help it accelerate
faster', since the dashpot dampers slow the rise of the dashpots.
It was flawed logic. All that removing the dampers did was to (as Kirk said)
cause the dashpots to rise erroneously fast leading to a huge lean condition
as it accelerated and a flat spot in the power curve. We played with heavy
weight oils, light weight oils and no oil and found (surprise, surprise) that
SU designed them pretty well and that using a lightweight oil (dashpot oil,
believe it or not) gave the best throttle response.
I know for a fact that John Twist advocates, nay, insists upon, using 90wt
in dashpots. His theory being how many times has that dashpot gone up and
in the 50 or so years that the car has been around, and how much wear has
there been on the interface? He has a point, and if you are just toodling
around town, you won't notice the difference, if you drive hard, who knows,
its mostly SOP feel anyway.
>From the work that I did with the Spit, I'd put another set of dampers in
use dashpot oil or 90 st whatever your gut tells you.
My experience and my $.02

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