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Racing Fuel Systems Forum for carb guys. 2023-09-26T20:14:20+01:00 http://racingfuelsystems.com/feed.php?f=4 2023-09-26T20:14:20+01:00 2023-09-26T20:14:20+01:00 http://racingfuelsystems.com/viewtopic.php?t=385&p=2630#p2630 <![CDATA[Carburetors • Re: IFR Size]]>
IFR should be sized to make the t-slots work right, and then the mixture screws end up where they end up to get a clean idle.

Statistics: Posted by cat herder — Tue Sep 26, 2023 8:14 pm

]]> 2023-09-25T23:50:58+01:00 2023-09-25T23:50:58+01:00 http://racingfuelsystems.com/viewtopic.php?t=385&p=2629#p2629 <![CDATA[Carburetors • Re: IFR Size]]>
I did not relocate the IFR's down low, but have recently tried a set of .035" then a set of .032" in place of those .038" on the primary side. The idle has always gotten very fat when the mixture screws are more than 1/2 turn open from seated, with the leaner restrictors I turned them out an additional 1/4 turn for a hot idle in the 14:1 area.

I recorded trips around a 1-mile square circuit from home, each 1-mile leg separately, for an A-B comparison on roads with speed limits of 45mph and 55mph. The results show a definite leaning of the A/F, get a good amount of 15:1 at steady, level speed driving, not sure I've read just how lean you can go in those specific conditions, but at .032" IFR for my 440 with a Racer Brown SS-H-44 .510 lift hydraulic as described it seems a safe zone.

I'm about to put .032" IFR in the secondaries, I don't know how important that's supposed to be when the secondaries get so little use the way I drive it unless it's on the strip, but for continuity I'll set it up square like that.

Statistics: Posted by kgb — Mon Sep 25, 2023 11:50 pm

]]> 2023-09-07T19:45:38+01:00 2023-09-07T19:45:38+01:00 http://racingfuelsystems.com/viewtopic.php?t=385&p=2549#p2549 <![CDATA[Carburetors • IFR Size]]> Statistics: Posted by MD383 — Thu Sep 07, 2023 7:45 pm

]]> 2022-10-28T21:11:21+01:00 2022-10-28T21:11:21+01:00 http://racingfuelsystems.com/viewtopic.php?t=213&p=2119#p2119 <![CDATA[Carburetors • Re: Partial throttle tuning help needed please]]> Statistics: Posted by TMP Carbs — Fri Oct 28, 2022 9:11 pm

]]> 2022-05-14T02:44:36+01:00 2022-05-14T02:44:36+01:00 http://racingfuelsystems.com/viewtopic.php?t=4&p=1702#p1702 <![CDATA[Carburetors • Re: Bogus Test Post]]> Statistics: Posted by Right hand drive — Sat May 14, 2022 2:44 am

]]> 2022-05-14T02:41:36+01:00 2022-05-14T02:41:36+01:00 http://racingfuelsystems.com/viewtopic.php?t=4&p=1701#p1701 <![CDATA[Carburetors • Re: Bogus Test Post]]> Statistics: Posted by mattax — Sat May 14, 2022 2:41 am

]]> 2022-01-29T00:43:18+01:00 2022-01-29T00:43:18+01:00 http://racingfuelsystems.com/viewtopic.php?t=272&p=1551#p1551 <![CDATA[Carburetors • Drilling Emulsion Bleeds]]> Statistics: Posted by BOOT — Sat Jan 29, 2022 12:43 am

]]> 2021-11-25T20:52:13+01:00 2021-11-25T20:52:13+01:00 http://racingfuelsystems.com/viewtopic.php?t=250&p=1319#p1319 <![CDATA[Carburetors • Happy Thanksgiving]]> Statistics: Posted by 57 210 — Thu Nov 25, 2021 8:52 pm

]]> 2021-08-17T15:24:55+01:00 2021-08-17T15:24:55+01:00 http://racingfuelsystems.com/viewtopic.php?t=213&p=1000#p1000 <![CDATA[Carburetors • Re: Partial throttle tuning help needed please]]> Statistics: Posted by jmarkaudio — Tue Aug 17, 2021 3:24 pm

]]> 2021-08-17T12:27:35+01:00 2021-08-17T12:27:35+01:00 http://racingfuelsystems.com/viewtopic.php?t=213&p=999#p999 <![CDATA[Carburetors • Re: Partial throttle tuning help needed please]]> Statistics: Posted by Carb.Designer — Tue Aug 17, 2021 12:27 pm

]]> 2021-08-07T03:12:51+01:00 2021-08-07T03:12:51+01:00 http://racingfuelsystems.com/viewtopic.php?t=213&p=969#p969 <![CDATA[Carburetors • Partial throttle tuning help needed please]]> Statistics: Posted by 69BBSS — Sat Aug 07, 2021 3:12 am

]]> 2021-07-05T16:08:03+01:00 2021-07-05T16:08:03+01:00 http://racingfuelsystems.com/viewtopic.php?t=194&p=851#p851 <![CDATA[Carburetors • Clear Carburetor]]> Statistics: Posted by jmarkaudio — Mon Jul 05, 2021 4:08 pm

]]> 2019-04-20T18:51:36+01:00 2019-04-20T18:51:36+01:00 http://racingfuelsystems.com/viewtopic.php?t=5&p=5#p5 <![CDATA[Carburetors • Motorcraft 2150]]> Statistics: Posted by nograin — Sat Apr 20, 2019 6:51 pm

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