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WEBER CARB BALANCING
Is there any trick in balancing the 40IDT carbs? I get equal flow at idle ok, but at part throttle there is some difference (about 2400 RPM). I believe this is responsible for the back firing in the exhaust and popping in the carbs at low speeds. There are only two shafts on each carb so it might require bending one of the shafts (not something I want to try). Any suggestions? Thanks
Bryan Wilson SMDT45A@Prodigy.com |
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07-15-1998, 02:12 PM
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I've thought about the problem again and now believe the mixture is wrong because of worn throttle valve shafts. Is there an easy fix or is the refitting of the oversize (8.5mm) shafts necessary? Who can supply the shafts?
Bryan Wilson |
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07-20-1998, 09:04 AM
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ASE Master Tech - 35 yrs
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worn out webers
those carbs run on the idle circuit all the way to 3000 rpm
p.s. - backfiring & popping can a myriad of causes - one of which is crudded idle jets with resultant incorrect "tuning" of the throttle opening to compensate just google "weber carbs backfiring & popping" get a good Weber book - there are a couple OR just send your webers to Mike Pierce & get done right https://www.piercemanifolds.com/Default.asp he's a good guy 
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"... I am German, and if it has no logic it's meaningless." 914 & 914-6 parts FS 03-2021 www.tinyurl.com/2pmpmv8y911 parts FS 2022 https://tinyurl.com/911-Parts-FS-LCM
Last edited by larrym; 09-03-2018 at 10:26 AM.. |
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09-03-2018, 10:02 AM
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Registered
Join Date: Jun 2003
Location: Camarillo, Ca.
Posts: 2,418
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This post was from 1998!
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Aaron. F.S. 1965 Solex engine w carbs/cleanerBurnham Performance https://www.instagram.com/burnhamperformance/ |
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09-03-2018, 11:14 AM
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Under the radar
Join Date: May 2007
Location: Fortuna, CA. On the Lost Coast near the Emerald Triangle
Posts: 7,129
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Quote:
 And yet the admin still won't display the original post date in the Thread Starter column.
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Gordon ___________________________________ '71 911 Coupe 3,0L outlawed #56 PCA Redwood Region, GGR, NASA, Speed SF Trackrash's Garage :: My Garage Last edited by Trackrash; 09-03-2018 at 11:27 AM.. |
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09-03-2018, 11:25 AM
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Registered
Join Date: Oct 2006
Location: MYR S.C.
Posts: 17,321
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hey, bryan has been waiting a looooong time for a reply, hope he gets it fixed now
they should lock threads after a certain time. only OP can post/unlock
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86 930 94kmiles [_ _] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD88 BMW 325is 200K+ SOLD 03 BMW 330CI 220K:: [_ _] RUNNING: [__] NOT RUNNING:01 suburban 330K:: [_ _] RUNNING: [__] NOT RUNNING:RACE CAR:: sold |
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09-04-2018, 04:06 AM
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MGB racer
"Sixer"
daily driver
hauler
My Garage
1971 Porsche 911
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