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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