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den;
If you have an undeniable need to buy a Unisyn, I expect they might be a bit tough to find nowadays...check with the British vintage car supplyers. I do recall IPD has a slightly different type in their most recent vintage catalog.
I find that "Listening Tube Method" is not particularily accurate because the placement of the end of the listening tube is critical and will hugely effect what you hear at the other end...varying it a bit when placing it at the two carbs negates any accurate induction volume comparison which might be drawn.
Instead, I use the "Look and Listen" technique...(after assuring linkages are synchronised), I start, set the idle, and Look to compare the amount which the dashpot is lifted due to induction (in fact: the induction raised dashpot of the carb is really similar to the induction raised indicator of the Unisyn), and I also stick my head down as well as possible between the the carbs to Listen and compare the induction noise directly...a diddle here and there on the idle adjustment screws to even them up, and the engine purrs like a Singer sewing machine! Trust your ears! I cant remember the last time my Unisyn made it out of the toolbox...wanna buy a used one?
Cheers
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