Thanks for the response Bob. I neglected to mention I don't have the
gas tank connected to the carbon canister, it's venting to atmosphere
(is that the EPA knocking on my door again?). I might make myself a
nicer catch tank though, my carbon canister is looking pretty worn out
(probably the original part).
Tim Holbrook
1971 TR6
--- "Robert M. Lang" <lang@isis.mit.edu> wrote:
> Date: Fri, 6 Dec 2002 12:08:54 -0500 (EST)
> From: "Robert M. Lang" <lang@isis.mit.edu>
> To: Timothy Holbrook <tjh173@yahoo.com>
> CC: 6pack@autox.team.net
> Subject: Re: Fwd: RE: RE: PCV on a Good's Triple intake?'s
>
> Hi Tim,
>
> THere's nothing "all wrong" with your system, but it's not exactly
> all
> right either.
>
> The PCV system and the carbon canister are there for two completely
> different reasons. PCV is there to keep unburned hydrocarbons (aka
> oil
> volatiles and blowby gasses) from escaping unburned into the
> atmosphere.
> Carbon canisters are part of the evaporative emmisions controls - the
> source of which is basically the fuel system.
>
> To vent the PCV to the carbon canister is not correct because you'll
> likely gum up the carbon (and make it innefective) in the canister.
> There's also the minor problem that should your fuel tank pressurise,
> you've created a path for fuel vapors to enter the sump. This is not
> likely a good idea.
>
> The seperate catch can approach is probably a more viable solution.
>
> On the race car, I use the windshield washer plastic "can" as the
> tank. It
> works quite well and looks "authentic".
>
> :-)
>
> If you want to make the sump PCV system work as it was intended, it
> is
> best to vent the sump into the carbs "downstream" of the damper - the
> later Z.S. carbs have a hose connection for this purpose. But if you
> run
> early carbs of SU's, this option is not available and you should vent
> to a
> tank. Note - the tank sould have some sort of filter to keep critters
> and
> other cruft out of the sump if you do not vent to the carbs (e.g. you
> vent to the atmosphere.
>
> rml
>
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