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For Sale / Wanted / 17059247 air horn
« Last post by dwelch on March 19, 2026, 08:12:13 PM »acc. pump arm where the pin goes through is broken. this is a 800 buick carb. would like to have a replacement to finish it.
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52
Quadrajet Carb Talk and Tips / Re: Bigger holes in Main body and Air Horn than First Recipe recommendation.
« Last post by Albert on March 19, 2026, 07:47:27 PM »Many thanks for your prompt reply Gents!
It will be next week before I can get on with the work.
I will let you know how I get on
It will be next week before I can get on with the work.
I will let you know how I get on
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Quadrajet Carb Talk and Tips / Re: Ideal AFR fuel curve - dyno results
« Last post by 70GS455 on March 19, 2026, 06:23:56 PM »Like this?Yes, but I left the POE tubes alone
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Quadrajet Carb Talk and Tips / Re: Ideal AFR fuel curve - dyno results
« Last post by 77cruiser on March 19, 2026, 05:44:13 PM »Like this?
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Quadrajet Carb Talk and Tips / Re: Bigger holes in Main body and Air Horn than First Recipe recommendation.
« Last post by Kenth on March 19, 2026, 02:38:13 PM »Albert, i would open the down channel restrictions to .046" to start with.
A picture where the bypass holes enters the manifold.
And a picture where the accelerator pump jets are drilled (thru the "blue" wall).
HTH
A picture where the bypass holes enters the manifold.
And a picture where the accelerator pump jets are drilled (thru the "blue" wall).
HTH
56
Quadrajet Carb Talk and Tips / Re: Ideal AFR fuel curve - dyno results
« Last post by 70GS455 on March 19, 2026, 02:07:23 PM »Wow, GS that's impressive, I remember the post. Can you go into more detail with the sec bleed tubes? Maybe some pics. So you put removable jets in the top and cross drilled the bottom of the sec air bleeds?I won't have any pics until the next time the carb comes apart.
I didn't add any jets, just soldered the top closed then re-drilled. Makes it easier to tune if needed. Yes, cross drilled the bottom with 4 smaller holes. Then closed the very bottom opening. That way emulsion air is not fighting fuel coming up.
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Quadrajet Carb Talk and Tips / Re: Bigger holes in Main body and Air Horn than First Recipe recommendation.
« Last post by lightning boy on March 19, 2026, 01:18:15 PM »Albert, as far as the bypass air. The milled slots in front of the primary bores are where the bypass air goes. Look Through the main body from the top and you can see the holes that correspond to where you need to drill the base. Don't drill the plates. One channel is straight and the other is doglegged or 90*. Since you have an electric choke, drill them to what Kenth said. It depends on the pcv too.
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Quadrajet Carb Talk and Tips / Re: Ideal AFR fuel curve - dyno results
« Last post by lightning boy on March 19, 2026, 01:02:10 PM »Wow, GS that's impressive, I remember the post. Can you go into more detail with the sec bleed tubes? Maybe some pics. So you put removable jets in the top and cross drilled the bottom of the sec air bleeds?
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Quadrajet Carb Talk and Tips / Re: Bigger holes in Main body and Air Horn than First Recipe recommendation.
« Last post by Albert on March 19, 2026, 12:31:09 PM »Hi All.
Thanks again for your initial answer Kenth.
I have confidence in my ability - just not quite there in my knowledge!!
That's why I have popped my question on this forum.
But man - have I learnt a lot in the last month or two!
I am so grateful for everyone that has posted questions, and answers on the various threads before I joined, and that has allowed me to confirm and learn so much before I jumped in to my first QJet restoration. My second will follow in a few months time.
Would it be possible please for confirmation that I have correctly identified the holes, and answers to my current questions, before I start to alter / enlarge any hole sizes?
Images to illustrate my questions are posted earlier in this thread.
I look forward to hearing from you.
Many thanks.
Albert
Thanks again for your initial answer Kenth.
I have confidence in my ability - just not quite there in my knowledge!!
That's why I have popped my question on this forum.
But man - have I learnt a lot in the last month or two!
I am so grateful for everyone that has posted questions, and answers on the various threads before I joined, and that has allowed me to confirm and learn so much before I jumped in to my first QJet restoration. My second will follow in a few months time.
Would it be possible please for confirmation that I have correctly identified the holes, and answers to my current questions, before I start to alter / enlarge any hole sizes?
Images to illustrate my questions are posted earlier in this thread.
I look forward to hearing from you.
Many thanks.
Albert
60
Quadrajet Carb Talk and Tips / Ideal AFR fuel curve - dyno results
« Last post by 70GS455 on March 18, 2026, 07:25:01 PM »Some years ago I posted about a funny shaped fuel curve. After doing some dyno test recently, I believe I have sorted it out. It made 609 hp and 614 ft lb with a nearly perfect AFR curve, still a little fat. What I had to do:
Typical primary recipe
0.149" N/S
0.146" sec jet discs
Smoothed and enlarged passages in the floor under the discs
0.067" tip rods
Rear air door max opening set at 1.190" (1.230" made the same power)
Sec discharge nozzles shortened and angle-cut
sec air bleeds to 0.022", orifice at the top, soldered the bottom shut, 4 x 0.018" lateral emulsion holes at the bottom
POE re-fill orifice at 0.030"
Stock POE exit holes at 0.050"
Video of the pull:
https://youtu.be/kzp28GRsq4U?si=oI48_JYP03nLNFrM
Typical primary recipe
0.149" N/S
0.146" sec jet discs
Smoothed and enlarged passages in the floor under the discs
0.067" tip rods
Rear air door max opening set at 1.190" (1.230" made the same power)
Sec discharge nozzles shortened and angle-cut
sec air bleeds to 0.022", orifice at the top, soldered the bottom shut, 4 x 0.018" lateral emulsion holes at the bottom
POE re-fill orifice at 0.030"
Stock POE exit holes at 0.050"
Video of the pull:
https://youtu.be/kzp28GRsq4U?si=oI48_JYP03nLNFrM