| [ Total Views: 584 | Total Replies: 2 | Thread Id: 21887 ] |
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 cumonghia
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| posted on April 20th, 2004 at 05:16 PM |
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about that mid mount webber
I was told one reason the 1916 is running bad is that the 40 dcn doesnt have a grove between the chambers. Im not sure if thats on the manifold or the
base of the carby. but if this grove is put in, it evens the flow. Now she runs rich, then sought of normal as the revs pick up and then she leans out
the harder you push it. has anyone hear of this grove?
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AdrianH
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| posted on April 20th, 2004 at 08:31 PM |
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Its like a balance tube. Should help with the reversion that you can experience with twin single throats (basically what you are running). I would try
grooving the manifold, worst case scenario is it doesnt help and you get it welded up !!!
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70AutoStik
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| posted on April 20th, 2004 at 09:22 PM |
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Don't think you could make enough of a difference with a groove on the manifold you likely have... The best would be if you could make up a plate
about .25-.5" thick with a gap in the middle between the two pipes to provide the plenum (that's what such a chamber is called.)
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cumonghia
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| posted on April 21st, 2004 at 06:16 PM |
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How deep should the grove/gap be? and why is it needed? so it will never run properly without it?
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bigbruvabob
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| posted on April 23rd, 2004 at 01:45 PM |
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bill fischers book says by slotting the base of the carby or creating a cavity by using a plate.spacer to create a plenum chamber you help eliminate
fuel standoff created by engine pulsations. the bigger the chamber the more the softening effect. it will mean you run a little leaner at high rpm as
the softer pulsations cause the airstream to draw out less fuel from the discharge nozzle.
for performance he recomends 32mm venturi1.30mains,1.85airs,f33emulsion
24mm venturi1.30mains,2.00airs,f38emulsion
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