Nelson,
I just took another look at the arrangement for the float chamber vent
valve. It looks like I can just remove the snap ring and vent lever, and
block off the port. Then I'll have the equivalent of my old carbs.
Thanks for the help.
- Hugh
> -----Original Message-----
> From: Nelson Riedel [mailto:Nelson@BuckeyeTriumphs.org]
> Sent: Tuesday, June 18, 2002 7:59 AM
> To: hfader@usa.net; '6pack'; 'triumphs'
> Subject: Re: Zenith Stromberg 175CD-2SE vs. 175CD-2SEV
>
>
>
> . These are diferent
> > from the stock 1972 175CD-2SE carbs in that they have a
> Float Chamber
> > Emissions Port (>
> > I am leery of emissions add-ons and troubles they may
> cause. Is there any
> > particular reason I should prefer using the original carbs
> without the
> float
> > chamber emissions port? >
>
> Hugh,
>
> These carbs should work just fine on a pre '73 TR6. The float chamber
> emissions port is connected by a vent valve to the float
> chamber. When the
> accelerator is opened, the vent valve closes the emissions
> port and opens a
> passage from the float chamber to the air filter housing just
> as the pre '73
> carb. With the accelerator released, the valve connects the
> float chamer to
> the port and on to the charcoal canister to catch the fumes
> when the engine
> is off. This connection is also used in conjuncion with the
> anti run-on
> valve when the engine is shut off.
>
> On the pre '73 engine I'd leave that port open -- this makes
> it work just
> like the pre '73 carb. If the port were plugged, the float
> chamber would be
> sealed when idling and float chamber pressure (depression)
> would vary as the
> float valve is opened and closed -- I'd think it'd cause
> rough idle. I'll
> try it later today on my '76.
>
> On second thought, a better alternative may be to screw the
> adjustment screw
> on the vent lever in as far as you can without restricting
> the amount the
> throttle can be opened. This should position the vent valve
> so that it is
> open between the the float chamer and the air filter housing
> even at idle.
> If you do this, you can then plug those emission ports to
> keep out debris.
>
> Nelson Riedel
> Granville, Ohio
> '68TR250, '76TR6, '70TR6 (project)
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