Post by fugly on Mar 10, 2010 19:52:28 GMT -6
This is a compilation of ACR's modifications according to white paper:
acr
Re: Posting Images of Work on AFB
« Reply #4 on: October 16, 2009, 11:18:42 PM »
The first photo below is what I saw when I removed the air horn, not a pretty sight. The venturi clusters & carb body were corroded & needed mild clean up with 240 grit, then 320 finger nail board.
The second photo shows the before & after work on the secondary venturi clusters, here I used a 320 grit board since
I didn't want to remove material, just clean up. I also used 320 grit paper for the underside of the cluster. Lot's of work
on the bottom side.
This photo shows the amount of corrosion, or poor casting that I cleaned up with a mildy worn 180 grit board, followed by 240 & 320. I had to be careful to keep the original lines & angles.
The next photos show the primary booster venturi with casting flash removed & 240/320 treatment top & bottom. I used Scotch Brite on the bottoms & insides that were hard to reach.
The last photo I need advice on. As you can see this cluster has a ridge at the top & side. Do I need to blend these in or..??
Fugly
Re: Posting Images
« Reply #5 on: October 17, 2009, 09:40:34 AM »
If you are talking about the one to the outside of the ring, it needs nothing as it has no bearing on flow
acr
Re: Posting Images
« Reply #6 on: October 17, 2009, 08:39:34 PM »
I mean the one at about 12:00 o'clock to 2:00 o'clock in the picture. It's right behind the nozzle of the booster venturi & is cast into the venturi cluster ring & sits up about .025". The 400 CFM are the only ones I've seen with this.
Fugly
Re: Posting Images
« Reply #7 on: October 17, 2009, 09:26:27 PM »
Blend the circled areas- the little nub on the bottom of the booster leg can be blended also if you want
Left side venturi cluster is a picture of the rough blended in work. Does it look OK or do I need to buy some A+B Epoxy?
Booster tube looks very nice-the back will work, but in the future simply file the ridge with a flat file to bring it down to the level of the rest of the ring. You don't want to disturb the shape of the entry any more than necessary- I have cutters I made to do this and still have to be careful....I would leave that one as is (no epoxy) and try filing the other one and lets see what you get
Fugly
Re: Posting Images
« Reply #11 on: October 21, 2009, 10:38:33 PM »
Very nice- you are going to have a nice carb
acr
Re: Posting Images
« Reply #12 on: October 22, 2009, 08:23:02 AM »
Thank you. One last question; What do you recommend for the choke horns (chokes are removed): 2-400 CFM AFB's, 18"x9"x3" air cleaner, Edelb. Air Gap 2x4 intake, mild plus build, 350 SBC., 2000 stall 700r4, 3.50 gear.
Leave stock height & radius?
Cut down to bottom of air filter?
Or other height?
I'll post pics of the air horn & carb when done.
Many thanks, Fred
Fugly
Re: Posting Images
« Reply #13 on: October 22, 2009, 10:27:42 AM »
what rpm range?
acr
Re: Posting Images
« Reply #14 on: October 22, 2009, 07:46:56 PM »
Mostly street driven, max apprx. 5800 RPM, shifts at 6000.
Fugly
Re: Posting Images
« Reply #15 on: October 22, 2009, 09:32:30 PM »
Cut the horn square. even with the air cleaner locating ring on the carb, deburr but don't rount the edges to any degree.
acr
Re: Posting Images of Work on AFB
« Reply #4 on: October 16, 2009, 11:18:42 PM »
The first photo below is what I saw when I removed the air horn, not a pretty sight. The venturi clusters & carb body were corroded & needed mild clean up with 240 grit, then 320 finger nail board.
The second photo shows the before & after work on the secondary venturi clusters, here I used a 320 grit board since
I didn't want to remove material, just clean up. I also used 320 grit paper for the underside of the cluster. Lot's of work
on the bottom side.
This photo shows the amount of corrosion, or poor casting that I cleaned up with a mildy worn 180 grit board, followed by 240 & 320. I had to be careful to keep the original lines & angles.
The next photos show the primary booster venturi with casting flash removed & 240/320 treatment top & bottom. I used Scotch Brite on the bottoms & insides that were hard to reach.
The last photo I need advice on. As you can see this cluster has a ridge at the top & side. Do I need to blend these in or..??
Fugly
Re: Posting Images
« Reply #5 on: October 17, 2009, 09:40:34 AM »
If you are talking about the one to the outside of the ring, it needs nothing as it has no bearing on flow
acr
Re: Posting Images
« Reply #6 on: October 17, 2009, 08:39:34 PM »
I mean the one at about 12:00 o'clock to 2:00 o'clock in the picture. It's right behind the nozzle of the booster venturi & is cast into the venturi cluster ring & sits up about .025". The 400 CFM are the only ones I've seen with this.
Fugly
Re: Posting Images
« Reply #7 on: October 17, 2009, 09:26:27 PM »
Blend the circled areas- the little nub on the bottom of the booster leg can be blended also if you want
Left side venturi cluster is a picture of the rough blended in work. Does it look OK or do I need to buy some A+B Epoxy?
Booster tube looks very nice-the back will work, but in the future simply file the ridge with a flat file to bring it down to the level of the rest of the ring. You don't want to disturb the shape of the entry any more than necessary- I have cutters I made to do this and still have to be careful....I would leave that one as is (no epoxy) and try filing the other one and lets see what you get
Fugly
Re: Posting Images
« Reply #11 on: October 21, 2009, 10:38:33 PM »
Very nice- you are going to have a nice carb
acr
Re: Posting Images
« Reply #12 on: October 22, 2009, 08:23:02 AM »
Thank you. One last question; What do you recommend for the choke horns (chokes are removed): 2-400 CFM AFB's, 18"x9"x3" air cleaner, Edelb. Air Gap 2x4 intake, mild plus build, 350 SBC., 2000 stall 700r4, 3.50 gear.
Leave stock height & radius?
Cut down to bottom of air filter?
Or other height?
I'll post pics of the air horn & carb when done.
Many thanks, Fred
Fugly
Re: Posting Images
« Reply #13 on: October 22, 2009, 10:27:42 AM »
what rpm range?
acr
Re: Posting Images
« Reply #14 on: October 22, 2009, 07:46:56 PM »
Mostly street driven, max apprx. 5800 RPM, shifts at 6000.
Fugly
Re: Posting Images
« Reply #15 on: October 22, 2009, 09:32:30 PM »
Cut the horn square. even with the air cleaner locating ring on the carb, deburr but don't rount the edges to any degree.