Carb size opinions
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TECH Resident
Joined: Sep 2009
Posts: 859
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From: Frozen Tundra, WI
Carb size opinions What size carb would you run on a street driven LQ9???
It has a very mild cam so my shift points should not be over 5500, if that.
I ran the numbers on the carb calculator and came up with 580 cfm.
Does a 600 carb seem ridiculously small for this motor or do I just need to realize the math is more accurate than my ego (bigger is better)???
It has a very mild cam so my shift points should not be over 5500, if that.
I ran the numbers on the carb calculator and came up with 580 cfm.
Does a 600 carb seem ridiculously small for this motor or do I just need to realize the math is more accurate than my ego (bigger is better)???
Everyone is still sleeping off last night's Holloween parties. Give it time.
In the mean time try using the search button to view some existing info
https://ls1tech.com/forums/conversio...-database.html
https://ls1tech.com/forums/conversio...-dist-ls1.html
Seems like the most common carb size is a 750 CFM. These motors flow more air than the first gen motors, so different rules apply.
In the mean time try using the search button to view some existing info
https://ls1tech.com/forums/conversio...-database.html
https://ls1tech.com/forums/conversio...-dist-ls1.html
Seems like the most common carb size is a 750 CFM. These motors flow more air than the first gen motors, so different rules apply.
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Carb Calculators See link below regarding why the carb calculator gave you a smaller number than logic dictates See link below regarding why the carb calculator gave you a smaller number than logic dictates....http://www.carcraft.com/techarticles/selecting_right_carb/index.html
To sum it up, Carbs are rated at 1.5-in Hg pressure drop. At wide open throttle your engine should be between 0 and 1-in Hg. Hope this helps. By the way, as stated previously, a 650 DP or a 750 Vacuum Secondary would work well on that engine in that truck.
To sum it up, Carbs are rated at 1.5-in Hg pressure drop. At wide open throttle your engine should be between 0 and 1-in Hg. Hope this helps. By the way, as stated previously, a 650 DP or a 750 Vacuum Secondary would work well on that engine in that truck.
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