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Thanks for the pics, appreciate the effort. Where the venturi is around the slide, you can se the step I was talking about, OK might only be a 1/2mm but still restricts the intake area slightly.
Quick question, do the 32mm carbs have carb heaters & coast enricher ?
Re the CV -V- Slide carbs, from some testing done by a British engineer using a flow bench his calculated difference, was that a CV needed to be 2mm larger than a slide carb to flow the same air flow, this is due to the butterfly valve which does NOT exist is slide carbs.
A well tuned CV will work as well as any slide carb, if its sized correctly. Most CR carbs etc only work better due to having an accelerator pump & a short intake track which allows the throttle to be pinned without bogging, a cheap slide carb does not have a pump. And peak power can be made at slightly higher rpm due to a shorter intake track length.
You can get CV carbs with accelerator pumps & a slide vacuum hole that is larger &/or with weaker slide springs to reduce the response time to equal slide carbs. You can also reduce the length of the intake stubs to get the same inlet track length. But as that negates most of the user friendly advantages of a CV carb, most people opt for a slide carb which is a known entity in racing !
YMMV
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