2.7 CIS WUR and Dizzy vacuum lines routing.

[boyt911sc]

Originally Posted by artwangler

Theoretically, the "TEE" can come of the top or the bottom of the decel valve. Because each is connected to a port below the butterfly valve. EI: each receives "manifold vacuum"
If you "TEE" off of the bottom of the decel valve, your vacuum will drop slightly sooner. Therefore, your fuel/air mixture will only be made lean for a shorter time. Since you have just taken your foot off the throttle, no need for a rich mix. If you "TEE" off the top of the decel valve, it will take a split second longer for the vacuum to drop. (I think....)

Art,

In completely agreement with first part of your post (underlined & bold). However, the 'tee' location (bottom or top) has nothing to do with the change in vacuum drop. It is controlled by the decel valve. BTW, the vacuum tee connection goes to the thermovalve then to the WUR.

Just for the sake of technical discussion, why would the vacuum drop sooner when 'teed' at the bottom compared to the top or vice versa? Keep us posted. Thanks.

Tony