Choke Horn Removal

-
RustyRatRod

RustyRatRod

I was born on a Monday. Not last Monday.
FABO Gold Member
Joined
Jun 7, 2010
Messages
110,468
Reaction score
112,299
Location
Georgia
Everything I've read about converting to blow through, the very first thing listed to do is mill the choke horn off. Why is this necessary? I could understand it might pick a few CFM without it, but does it HAVE to be done? I get removing the choke and plugging the linkage hole. But can the choke horn remain?
 
RustyRatRod said:
Everything I've read about converting to blow through, the very first thing listed to do is mill the choke horn off. Why is this necessary? I could understand it might pick a few CFM without it, but does it HAVE to be done? I get removing the choke and plugging the linkage hole. But can the choke horn remain?
Click to expand...
I can see it being more significant in a forced induction situation. But I aint ****.
 
It seems like the choke tower can create an imbalance in air flow and/or booster signal between the primaries & secondaries. While the difference may be small and obviously works in OEM configuration, forced induction may magnify the situation to an unacceptable level.
Calling some turbo manufacturers may provide conclusive answers.
 
RustyRatRod said:
Everything I've read about converting to blow through, the very first thing listed to do is mill the choke horn off. Why is this necessary? I could understand it might pick a few CFM without it, but does it HAVE to be done? I get removing the choke and plugging the linkage hole. But can the choke horn remain?
Click to expand...
Assuming this a 2bbl. I don't know about forced induction but, NA these usually are worth some power on the dyno. When a holley 2bbl. is tested on my flowbench with an aircleaner housing and the flow hat they will pick up some cfm. Most of the time you will have to jet up a little with this.

Edit: On second thought this probably won't fit with a conventional blow through hat.

Carburetor Flow Hat
 
Last edited:
I'd heard it was because it would get too close to some of the carb hat designs, restricting flow on the primaries. That never made sense to me, as most Carters and QJ's had enough secondary to drive a Nova through.
 
We removed it for a supercharger because it partially plugged the entrance of the air hat. Other then that we would have left it go.

aomni12%5B1%5D[1].jpg


aomni22[1].jpg
 
jos51700 said:
I'd heard it was because it would get too close to some of the carb hat designs, restricting flow on the primaries. That never made sense to me, as most Carters and QJ's had enough secondary to drive a Nova through.
Click to expand...
Now that makes sense. Thank you.
 
You must log in or register to reply here.
-

Back
Top