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    VWVortex


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    Thread: why don't I see down-draft fuel distributors on up-draft metering plates?

    1. Member
      Join Date
      Apr 6th, 2008
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      1981 Jetta 16v ITB/CIS, 1982 Jetta ABA Turbo, 1977 Scirocco pile
      08-20-2012 07:07 PM #1
      I'd like to use a Mercedes 8-pot fuel distributor, but I also want to keep the standard up-draft VW metering plate
      I understand the downdraft plates move the plunger in the dizzy upwards, while the updraft ones move the plunger downwards, but if i swap the plunger from one to the other, would it work the same way? the fuel galleys inside of the dizzy are in the same place vertically between the two, aren't they?

      thanks

    2. Member
      Join Date
      Aug 14th, 2005
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      Germany
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      08-21-2012 04:25 AM #2
      Quote Originally Posted by ArsenicPants View Post
      I'd like to use a Mercedes 8-pot fuel distributor. . . I understand the downdraft plates move the plunger in the dizzy upwards, while the updraft ones move the plunger downwards . . .
      Nope, they both move in the same manner to do the fuel delivery. The difference is the pivot point for the two. The updraught type have the pivot point at the end of the air sensor arm and the plunger rides in the middle (more or less). On the downdraught ones the pivot point is towards the middle of the air sensor arm and the plunger rides at the end (again more or less). So the movement of the air sensor still causes the plunger to move in the same direction.

      As for wanting to use the Mercedes fuel distributor I guess that would be another topic.

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