jetting carb

Old 06-10-2010, 03:16 PM
  #1  
greenone60
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Default jetting carb

i have a jetting ? when the weather gets hot do you go up(rich) on the jet sizes or do you go down(lean) and ideas. 1/8 mile drag car with sbc running 114 sunnco race fuel.single carb 850 holley hp
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Old 06-10-2010, 05:08 PM
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wrightway
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Old 06-10-2010, 05:20 PM
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curtisreed
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Originally Posted by wrightway
Down
X2
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Old 06-12-2010, 11:19 AM
  #4  
chevyart
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Default hot weather

what do you guys do with the timing in the real hot weather. up, down, or leave it as is ? thanks chevy art
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Old 06-22-2010, 06:44 AM
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chevyfireball
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When the weather gets hot or the altitude goes up, the air gets worse so you can't burn as much fuel so you need smaller jets. I usually only alter the jetting two sizes.

I only alter the timing when the car is over powering the track (retard it 1 - 1 1/2 degrees. If I'm wanting to set her on kill I advance it 1 - 2 degrees. Just make sure you're checking your plug condition after each run to avoid detonation etc.
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Old 06-22-2010, 10:21 AM
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JEFF69Z28
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over powering the track= spining the tires?
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Old 07-02-2010, 05:30 AM
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chevyfireball
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Originally Posted by JEFF69Z28
over powering the track= spining the tires?
Yep. Some tracks aren't prepped that well. With a glide, convertor and nitrous motor there aren't too many options to get traction without losing too much power.
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Old 07-02-2010, 01:26 PM
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Tod74
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I never mess with mine. I leave it the same all the time.











Of course I also lose in the first round most of the time too. :lol:
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Old 07-05-2010, 11:24 PM
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cepx111
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I agree, hot/humid weather likes a leaner A/F ratio.

Jetting it down will aslo make it more consistent if you race where theres a temp drop from TT's to elims , E.G> daytime TT & nighttime racing.



I jet for consistency - not power/ET.\

Cp
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