A 'gulp' valve is an emission control device that limits intake manifold
vacuum during overrun (engine braking or deceleration) by allowing filtered
air directly into the intake manifold under high vacuum.
I believe it's purpose is to limit unburned hydrocarbons, by effectively
making the mixture extremely lean under these conditions, where it wouldn't
be burned anyway (not enough compression to fire). It also helps prevent
exhaust backfires during long decelerations
AFAIK, 'Gulp valve' is American slang. I don't know what the auto
manufacturers, or the British, call it, but it's probably something else.
However, Moss calls it a gulp valve.
> -----Original Message-----
> From: firstname.lastname@example.org
> [mailto:email@example.com]On Behalf Of Douglas Frank
> Sent: Friday, March 10, 2000 10:08 AM
> To: Triumphs
> Subject: what's a "gulp valve"?
> as seen on ebay:
> Douglas Frank Compaq Computer Corp. Friendship, n.
> ZKO 110 Spit Brook Rd. A ship big enough to
> carry two in
> 603-884-0501 Nashua, NH USA 03062 fair weather, but only one in