 Weber 44 idf flat spot |
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| tornik550 |
 Jul 4 2013, 11:59 AM
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Senior Member  Group: Members Posts: 1,248 Joined: 29-January 07 From: Ohio Member No.: 7,486 Region Association: None  |
So I recently purchased new weber 44 idf's. They didn't work out well so I went back to an old set of weber 44 idf's that I had. I thoroughly cleaned the carbs, sprayed carb cleaner through all jets, tubes, etc. I have also balanced the linkage. Set the floats, etc.
The car starts well. Idle's well. When I drive the car I get a major flat spot between 1500 and 3000 rpm's. Below and above the car accelerates normally. What changes should I make? My current setup for my 2258 (dual webers, big cam) -idle 55 -main 160 -et F11 -ac 200 -vents 36 Are there other issues that can cause this type of problem (timing,etc?) |
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| ChrisFoley |
Jul 14 2013, 10:29 PM
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#2
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I am Tangerine Racing Group: Members Posts: 7,967 Joined: 29-January 03 From: Bolton, CT Member No.: 209 Region Association: None 
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The true exhaust temp is a lot higher than that.
Reading the pipe temps with an IR thermometer is a good way to check for all 4 cyls working equally but won't give any data on A/F mixture. CHT could be between 250 to 400 possibly, depending on load and rpm. High load combined with low rpm will generate the highest cyl head temps. Oil temp peaking at 220 under hard driving in hot weather sounds perfect to me. |
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Posts in this topic
tornik550 Weber 44 idf flat spot Jul 4 2013, 11:59 AM
ThePaintedMan
So I recently purchased new weber 44 idf's. ... Jul 4 2013, 01:36 PM Elliot Cannon
So I recently purchased new weber 44 idf's. ... Jul 4 2013, 01:36 PM r_towle f7 or turbo emulsion tubes help with flat spots, a... Jul 4 2013, 02:02 PM brant 28 vents. Perhaps 40 mm carbs Jul 4 2013, 02:24 PM Starlack Hello
This is the transition area from idle jet t... Jul 4 2013, 02:41 PM tornik550 The interesting thing is that my car ran great in ... Jul 4 2013, 02:57 PM tornik550 Thinking about this situation, I think the suggest... Jul 4 2013, 03:12 PM McMark The carbs weren't really flowing fuel when the... Jul 4 2013, 03:16 PM tornik550 Ok, I am getting a bit pissed off at weber now. ... Jul 4 2013, 03:45 PM
Racer Chris
So for the record- does the longer side of the se... Jul 5 2013, 06:55 AM sean_v8_914 good advice above
smaller vents
smaller main jets Jul 4 2013, 04:05 PM sean_v8_914 long side of taper down. spray hole down Jul 4 2013, 04:06 PM sean_v8_914 http://www.carburetion.com/diags/40IDFDiaginfo.asp Jul 4 2013, 04:07 PM sean_v8_914 a wide band O2 would be nice for selecting the tru... Jul 4 2013, 04:09 PM tornik550
a wide band O2 would be nice for selecting the tr... Jul 4 2013, 04:17 PM Mblizzard On my weber 44s, 28 vents made all the difference.... Jul 4 2013, 04:25 PM Woody I run 36 vents and the car runs great. I have a se... Jul 4 2013, 08:53 PM McMark If you take the vent out you'll see one side i... Jul 4 2013, 11:54 PM tornik550 I have worked out my flat spot. I found that the ... Jul 12 2013, 08:15 AM Racer Chris
I have worked out my flat spot. I found that the... Jul 12 2013, 08:28 AM tornik550
I have worked out my flat spot. I found that th... Jul 12 2013, 08:31 AM Jake Raby
The only issue that I am having on the wideband... Jul 12 2013, 06:31 PM tornik550
The only issue that I am having on the wideban... Jul 12 2013, 07:46 PM Racer Chris If you back off the nuts on the accel pump rods an... Jul 12 2013, 11:24 AM ThePaintedMan
I thought I read somewhere that smaller vents gi... Jul 13 2013, 02:01 PM Racer Chris
In theory, every form of the Type IV below about ... Jul 13 2013, 02:46 PM ThePaintedMan
That is absolutely false.
With wideband air/fuel... Jul 13 2013, 05:38 PM Racer Chris
But Chris, weren't you suspecting that the en... Jul 14 2013, 10:01 AM r_towle That motor in the red/ white race car had basicall... Jul 13 2013, 05:06 PM tornik550 Chris-
I followed your instructions on tuning my c... Jul 14 2013, 07:46 PM |
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