CARB IDLE

Old 05-27-2009, 11:28 AM
  #11  
Tod74
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How fast is it idling in park? Have you tried turning the idle speed up? Mine won't idle below about 1700 somethin' like that.
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Old 05-28-2009, 04:32 AM
  #12  
JEFF69Z28
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Originally Posted by Tod74
How fast is it idling in park? Have you tried turning the idle speed up? Mine won't idle below about 1700 somethin' like that.
SBC IDLE IS AT 1200 RPM.
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Old 05-28-2009, 11:29 AM
  #13  
dparker
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Jeff somethings you might check is..
Fuel pressure 7 psi
Idle screws out 1 1/2 to 2 turns
Make sure your needle seats are not running over
Check for vacuum leaks
Check vavle lash
I've seen guys drill an 1/8 hole in the butterfly to help to keep their engine from loading up.
A few things to check...........
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Old 05-28-2009, 11:35 AM
  #14  
FullTimeRacing
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got mine around 1500 when hot
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Old 06-01-2009, 10:09 AM
  #15  
JEFF69Z28
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SCREWS WERE OUT 1.5 TURNS,TURNED THEM OUT TO 2 TURNS AND IT NOW IDLES FINE.
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Old 06-04-2009, 05:51 AM
  #16  
dparker
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If turning the idle screws out another 1/2 turn fixed your idle, then you were to lean. The idle screws are a minimal change so your probably still a littel lean, if you have removable air bleeds on the top of your carb. You can put a smaller air bleed in the most outside air bleed from the vent tube to richen your engine at idle alittle more. Otherwise your probably going to have a bog at launch.
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Old 06-04-2009, 05:55 AM
  #17  
JEFF69Z28
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I HAVE REMOVABLE AIR BLEEDS AND BOGGING IS A PROBLEM AS YOU CAN READ IN MY OTHER POST.IT LAUNCHES STUTTERS AND GOES DOWN THE TRACK FINE,LAST NIGHT COMING UP PIT ROAD IT HAD A MISS ALSO IT BACKFIRED THRU THE EXHAUST WHEN I LET OFF THE GAS AFTER MY RUN.
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Old 06-04-2009, 05:56 AM
  #18  
dparker
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What jets are you running and what size is your carb.
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Old 06-04-2009, 06:07 AM
  #19  
JEFF69Z28
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950 HP BODY 840 CFM CANT REMEMBER JET SIZE AS IM AT WORK.50 CC PUMP IN FRONT AND 30 CC IN REAR SQUIRTERS ARE 40 FRONT/40 REAR.
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Old 06-04-2009, 06:17 AM
  #20  
dparker
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Originally Posted by JEFF69Z28
950 HP BODY 840 CFM CANT REMEMBER JET SIZE AS IM AT WORK.50 CC PUMP IN FRONT AND 30 CC IN REAR SQUIRTERS ARE 40 FRONT/40 REAR.
Anything over a 35 squiter I would have a .50 cc pump. I think your problem is that your to lean. Now to figure out where your to lean at. Make sure you don't have much free space between you pump lever and the linkage from the carb. It has a small bolt and nut with a spring in between. I think your close on the squiter size I run a 40 to a 45 depending on carb and air. On the air bleeds you can go down say 5 sizes on the idle air bleed and it will richen your idle circuit making your engine more responsive. I don't think it would hurt to go alittle bigger on your jets to see it that helps. I guess I should have asked, do you have an EGT?
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