Mike the valve cover outlet is not to provide extra air to your carb it is
there for several reasons. first it Keeps your crankcase from becoming
pressurized and blowing headgaskets (among other things) BMW's are actually
made this way. Second, the hose goes to both the carbon canister and the
carb, reason being to burn off excess oil fumes that would escape into the
atmosphere by putting them back into the combustion chamber, and the carbon
canister to absorb excess fumes to keep from overwhelming the carb. I am
sure there is a little more to the emissions equation, but this is a quick
example.
Patrick Bowen
-----Original Message-----
From: Mike Perry [mailto:mikep@michindust.com]
Sent: Thursday, August 12, 1999 9:45 PM
To: spitfires@autox.team.net
Subject: More Carb/Emissions Questions
It seems to be carb changing season for 72 spits!
When I attempt this changeover, what will become of the vent tube on the
valve cover? I am assuming it needs to "breathe"....seems to me we used to
pop a vented cap on top of the later Chevy small blocks I fooled around on
in high school when we removed the emissions stuff.
By rights the presence of this tube shouldn't affect performance, as it is
essentially an alternate source of air for the carb...am I correct? My
preference it to clean as much of the extra hose mess out as is practical.
Thanks again!
Mike
72 spit, trying to regain some semblance of performance from an emissions
"neutered" 1296!
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