Just to be clear,
The Mac Read breather uses a Non Return Valve on the timing chest and a condensation system which returns oil down a capillary tube to the D Cap - exactly as explained by Ian (b'knighted) above. I have had one on my Rapide for about 30 years. Yes, it is pig-ugly but still works perfectly to this day holding a partial vacuum in the crankcases - so no leaks. I fit a plastic "compressor silencer" to a piece of rubber tube at the outlet end - hidden under the tank. This removes the plop-plop sound of the NRV. I like my Vincents to be shiny - but also practical and trouble-free to use over long distances. This fits the bill perfectly. If I want to go back to standard for any reason; it takes 10 minutes.
The R Kemp breather takes a slightly different tack using the slow movement of oil-laden air through a large volume of "wire wool" to condense oil back in the timing case. I have never used this system but know plenty of people who have and they have been pleased with its function.
I'll try and add an old photo or two of the Rap…
Peter B
Bristol, UK.
The Mac Read breather uses a Non Return Valve on the timing chest and a condensation system which returns oil down a capillary tube to the D Cap - exactly as explained by Ian (b'knighted) above. I have had one on my Rapide for about 30 years. Yes, it is pig-ugly but still works perfectly to this day holding a partial vacuum in the crankcases - so no leaks. I fit a plastic "compressor silencer" to a piece of rubber tube at the outlet end - hidden under the tank. This removes the plop-plop sound of the NRV. I like my Vincents to be shiny - but also practical and trouble-free to use over long distances. This fits the bill perfectly. If I want to go back to standard for any reason; it takes 10 minutes.
The R Kemp breather takes a slightly different tack using the slow movement of oil-laden air through a large volume of "wire wool" to condense oil back in the timing case. I have never used this system but know plenty of people who have and they have been pleased with its function.
I'll try and add an old photo or two of the Rap…
Peter B
Bristol, UK.