One very good reason to have the valve cover breather connected to the air
cleaner is to
prevent the venting of untreated hydrocarbon emissions - that's why you began
to see this
feature on automobiles in the smog control era. Granted, the emissions from the
crankcase
are probably not a big percentage of the total emissions from the vehicle, but
sucking
them through the engine and burning/reburning them (because some are oil fumes
and some
are blowby from the combustion chamber) is better than just dumping them out of
a
crankcase vent.
The slight negative delta P resulting from the connection to the air cleaner
also helps
scavenge the crankcase more efficiently, combating lube oil contamination by
combustion
gases that get past the piston rings - all with no performance penalty!
Gary McCormick
San Jose, CA
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CalSpeed@aol.com wrote:
> Hello Dan,
>
> Yes the Solex carbs have just one cable. I hear that the cables are more
> difficut to locate but they are out there somewhere.
>
> In regards to the valve cover breather tube. Yes, it is suppose to connect
> to the stock SOlex cleaner. I currently have my Solex Cleaner hanging on the
> wall. The tube is secured to pont away from any moving items. I was told
> that there were two purposes for this connection. When the tube was connct
> to the cleaner unit it also served a purpose as to help draw air from the
> motor. I dont know how much difference the carbs would make as it drew air
> through the tube.
>
> Michael "Calspeed" Carion
> 67.5 SRL311-000248 Solex
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