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Old 04-21-2011, 03:25 PM
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carb thoughts

Have to wonder if there are charts or basics in small carbs.
everybody knows Holley or other big carbs come rated by cfm. 650, 750 etc.
I'm working on a old Volvo B20 with a Weber thats a 32/36 (DGV ?)
but not finding cfm rating. Have to wonder what they compare to?
Say like an old Rochester 2bbl. ?
Be interesting to compare apples to apples.

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Old 04-21-2011, 09:37 PM
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There are 3 sizes in the small 2 g's, 1 3/32", 1 3/16", and 1 1/4" venturi's with the 1 7/16" throttle blades, the large 2 G's have a 1 11/16" throttle blades and go up to 1 3/8" venturi There's a chart on the Pontiac tri-power site.
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Old 04-22-2011, 02:58 PM
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I tried to find that chart. No luck. Have a link? I found a pretty cool tri power site which was fun but no chart.
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Old 04-22-2011, 03:14 PM
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"Large" 2G Carb came in at least four sizes:

1-11/16" throttle plate bores
1-3/16" venturi: 350 cfm
1-1/4" venturi: 380 cfm
1-5/16" venturi: 425 cfm
1-3/8" venturi: 435 cfm

The small (1.25") bolt pattern 2G carb that had a 1-5/32" venturi and a 1-7/16" throttle plate bore was rated @ 280 cfm.

NOTE: All cfm ratings for 2-bbl. carbs are @ 3"/Hg. 4-bbl. carbs are rated at 1.5"/Hg.
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Old 04-22-2011, 03:30 PM
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Good stuff thanks!

found this thread with some info...Carburetor CFM rates
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