Quickfuel 3-circuit
Trying to sort out a Quickfuel 1250 on gas, when running on the stop it's a fat pig and doesn't come off the stop cleanly. Is a 3-circuit carb just wrong for t-stop racing? Currently running a 95 main, .046 idle, .076 intermediate, and unknown HSAB - no digits on it. The O2 shows a big rich spike on the stop and it blubbers it's way through it. Wondering what to do next........ 8) JB
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I had one of their 1150's on my car and it was impossible to get a good stop ratio. I went to a Holley hp 2 circuit and its good to go now.
That may be just me though, I dont have good luck with carbs...lol... |
I built my own 2 circuit 1250 and love it. Start by taking the intermediate bleeds out, put in .025 HSAB's, and jet up to 98 for starters. As long as you don't get an uncurable lean condition at WOT, you can probably plug the intermediate jets as well, it depends on what you have for metering blocks and what mods were made if any. This is a very common issue with a 3 circuit carb. After plugging the 3rd circuit you can't get WOT rich enough I'll get you more info.
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I've heard many complaints on the Quick Fuel carbs. I've heard the 2 circuit is better than the 3 for thottlestop. Check your HSAB with a drill bit, I'd guess its around 35. I don't agree with the 98 jets. Your adjusted air is at 6500ft, 98 jets will be way to much. I would put 93 jets in the main and a 24 to 26 in the HSAB. That will lean out your midrange and still let you have enough fuel on the big end. If you race Hobbs this weekend, I think I have some small air bleeds 24-26.
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Thanks for the tips Dean-o, I woke up sick'rn a dog this morn, I'm not going anywhere today. Hope it ain't the swine flu......see ya in a couple weeks.. 8) JB
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Originally Posted by dparker
I don't agree with the 98 jets. Your adjusted air is at 6500ft, 98 jets will be way to much. I would put 93 jets in the main and a 24 to 26 in the HSAB.
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The quickfuel guys were pretty concerned even with the 94 jet, so I can see your point about the 1250. Probably will start at about 95, since I'll be leaning the int. circuit. Going to call them Monday about changing this to a 2-circuit. 8) JB Edit: It sounds like I should be able to do it no problem.
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I would suggest at least 1 jet over what the carb came with when removing the intermediates, you don't want to be too lean at WOT. The idea is to get the low and midranges on the lean side, and the fuel curve in the range you run it WOT in as flat as possible. Pulling the intermediate bleeds may make it manageable enough an should show improvement, an as long as the metering blocks have had the mainwells opened enough you should have no issues getting it rich enough and the fuel curve flat without the intermediate circuit.
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Originally Posted by jmarksdragster
Originally Posted by dparker
I don't agree with the 98 jets. Your adjusted air is at 6500ft, 98 jets will be way to much. I would put 93 jets in the main and a 24 to 26 in the HSAB.
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To change the subject sc4405, you should have come racing today. J.Wenger and Glen the torke convrter guy(Glen) in the finals tonight with Glen winning his 2nd race in a row today. I think Cotham and Callaway went out in the fifth round. With Wenger going to the finals beating my a## in the fifth round also should give him sole possesion of first in the points.
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