BTW, I do remember a heat shield in my Dolomite with twin SU's in the UK,
factory fitted as standard on the 1500 engine.
Alan
Bob Sykes wrote:
> mikep@michindust.com wrote:
>
> > Good Day....I hope everyone enjoyed their cars this weekend!
>
> Good Day, & yes indeed!
> //
> > After installing my dual HS4 setup, syncing the carbs (UNISYN) and checking
> > the mixture (COLORTUNE), the car runs great, except when in stop and go
> > traffic or after an extended idle. It "feels" like it is flooding itself,
> //
>
> Short answer, two words: "Heat Shield"
> (I'm assuming you don't have one)
>
> Longer answer below:
> I had the same problem when I initially fitted HS4s to one of my Spits.
>
> > I installed Gross Jets in place of the float needles, but that does not
> > appear to have made a difference.
>
> BTDT - New needle valves, Grose Jets, didn't help, also checked &
> rechecked floats, even set them "low". Also tried fuel pressure
> regulator which helped some, but is unnecessary once the heatshield
> is in place.
>
> > Other potentially useful information:
> > 1296, low miles
> > Headers
> //
> This (the headers) is the other part of the equation:
> The headers produce more radiant heat than the cast iron manifold.
> When the car is moving at a reasonable clip, there is enough airflow
> past the exhaust/carbs to keep them happy. Not so for slow moving.
>
> I can run the SUs with the stock manifold and no heatshield without
> the problem you described. I Can't run the headers sans heatshield,
> even in the winter. The ZS and Weber carbs do not seem to be as
> susceptible to this malady. Hope this helps...
>
> --
> LBC'ing U,
> Bob (& Spitfires)
> [digest mode]
> http://home.att.net/~stan.part
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