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Discussion Starter · #1 ·
hi all
got the new carlsson on sat and have just noticed it has what i believe to be a recurculating dump valve
what is the difference between that and an atmospheric dump valve , shouldn't they make a psssssttttt noise when you let the accelerator off and are they really worth using
thanks
mark
 

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The recirculating dump valve should be nice and quiet, whereas the atmospheric goes whoooosh.

I can tell you from my own experience that I had problems with another air reverberation in the airbox, so I reverted back the Abbott/Forge recirc type valve, however since removing the airbox my silent dumpvalve is no longer, at least the reverb has gone !

Andy

You do want to replace the standard valve at some point as the diaphrams are a weakness
 

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Originally posted by Lee123:
[qb]what extra bhp can be expected from fitting a dump valve? [/qb][/b]
I wouldn't expect any.

The reason I fitted a Forge DV is that it is servicable unlike the Bosch diapraghm DV that is likely to fail at some point.
 
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