Technical Stromberg 97 holes drilled in air horn?

Why would someone drill holes in the air horn of these carbs. Six of them have holes drilled in them.

Thanks

 

Well one thing for sure they probably all came from the same owner...

Maybe that's where the special sauce went...that's crazy eh...

Early pollution control? As in blowby infused for a second round of combustion...

They all look to be in the same location...

Maybe a deburr both side and fill with gas resistant filler...it just penetrates the bore and nothing else...does it sit between the choke plate...

 

To let unfiltered air into the engine.

 

Just to confuse the next owner......interesting though.

 

Maybe they were experimental carbs and had analization equipment in them...

 

Cmon guys.. Its for methanol injection !

 

I've seen a factory
L-79 Holley carb that had small 1/8 inch diameter holes drilled into the venturi body a half inch above the throttle plate....

 

Both Stromberg and Carter once supplied tech schools with carburetors for the students to use for learning purposes (disassembly, reassembly). Possibly Holley and Rochester also did the same, but I have no proof of that.

Both Carter and Stromberg drilled holes in the castings thereby making the carburetors non-serviceable.

These are commonly referred to as "school carburetors".

Jon.

 

Just read Dueces post.

Several different O.E. carburetors used the small holes just above the throttle plates as a method of hot idle compensation. The ones with which I am familiar (Stromberg WW) were located in a "dead" vacuum area, so no "dirty" air enters the carburetor.

During city driving in the summer (or anytime with deathanol fuel), there is pressure in the throttle body, which if not relieved, causes an overrich condition, sometimes to the point of stalling. The small DESIGNED holes alleviate the issue.

Please do not read this post thinking one can fix all hot idle problems by drilling the holes!

Jon.

 

Could someone have been experimenting with water injection?

 

Six out of eight cylinders were running rich, so they needed more air.

 

He just never got around to drilling holes in the other 2?

 

I've got nothing on 'why the holes' but I think the 2 without holes have oxidized slightly different, like they may have a separate past life.

 

@uncle max

if anyone knows it’s Uncle Max

 

I’m pretty sure that Carbking already supplied the answer….

 

I was also thinking maybe water injection.

 

Bad Bootleg batch injection......very environmentally friendly and gets one home WAY quicker...

 

Thanks for the reply’s everyone. I’m not sure if the carbs were ran on the intake. This intake was a supposedly ran on a “full race” 331 Chrysler Hemi that came from Ca.