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weber dcoe air horns


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Guest Anonymous

are air horns necessary on the 40 dcoe's type 18? it appears as if they hold the venturi's in place, or at least partially. if to run no horns is there a part that does the job of holding the venturis in place? any help would be appreciated...

-ian

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Guest Anonymous

ian-

the 40 uses the air horns - stubby or long - to help secure the main venturis - they locate the things and the horn clips keep the whole shebang from moving. If your carbs have the lockscrew on 'em to hold the vents - i.e., a later-production carb - then you don't *need* 'em, per se.

however, they reduce turbulence and are good for a significant torque/throttle response boost if you rejet to suit 'em. want proof? Slot a set on, and you'll find the car's probably running a tad lean as a result of the mildly increased airflow.

so if you can, at all, run 'em.

Alternately, if you don't have the lockscrew bodies, don't want to run a stack of some kind, don't have the weber backplates or spacers that hold the vents in, and have problems with the vents rotating or rattling (some have spring clips to reduce this...),

then just drill and tap the body for a setscrew and locknut.

not 100% positive on the 45s - their aux vents are different, and it's been a while since I've seen a set. If I remember right, though, it's the same principle.

Sam

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