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Rs38 flat sides vs standard 1200 mk1 carbs


Alex

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Hi. Does anyone know the advantages and disadvantages of rs38 flatsides for road use over standard. I will be putting on a skimed/ported/Kent reground cams head I have a 4-2-1 acrapovic / 5deg advanced ignition. These rs38's seem a lot of money but are they really worth it for road use? 

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Just swapped from rs38’s To 36mm cv’s and modded airbox on my 1216 bandit and i’m Really enjoying the smoothness of the cv’s . As a road engine the cv’s are nicer to use but I do miss certain elements of the flatties , namely to accelerator pump delivery. Someone has suggested 38mm cv’s as they have a similar set up 

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ref: carb size - had this discussion with racers / tuners - new school and old school and i'm dam't if I can nail down an agreed consensus of opinion based on result - summary is - especially as you've gone to effort of porting and cams - you'll likely be chasing rpm = new school response - go as big as you dare ( use your inlet port entry size as a guide )

old school will tell you go the opposite = as small as you only need to go, it will be more efficient at part throttle, easier to tune ( or read as more forgiving if they are not right on tune ) - ok so no answer for you ¬¬ my own experience ( was old school) is modern flatslide smoothbores are mucho better at partial fueling these days - i.e. go big

CV versus directlift smooth bore - if its performance then 100% the smoothbore pumper - maybe not if you only look at the top HP but the initial punch / drive / throttle response - no competition ( and you can gain on mpg as an added bonus )

if its good performance with a smoother lazier pick up, lighter throttle etc.. i.e. the stuff that makes mile crunching on the road more pleasant = go CV

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