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I run 34's in my 45's... (archive)

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Posted by mikeS on June 28, 2001 at 11:08:32:

In Reply to: Ventury sizes matters posted by Lee on June 27, 2001 at 20:38:39:

34mm venturis in 45mm carbs is clearly off the "thumb" ratio of 1.25. But they work _great_ with a stock motor. I was told that 32mm venturis is really the lower limit for the stock 2-liter. 34mm is good for stock or a mildly modified cam. Go 36mm (probably won't work in a 38mm carb) if you have a radical cam and can use some space over 6500rpm; the full-blown 45mm race setup (Alpina) has 38mm venturis, which don't work for crap on a street motor.

So, if you can get 32mm or 34mm venturis for the 38mm carb, go for it. Sounds like you can't beat the price.


If you check tables of fitment for drafties, you would see that DCOE40 are often used with 32 or 34mm venturies on 2 litre engines. This means that a 38DCOE with 32-34 venturies will work just as well.

The bigger the venturies, the bigger the flow but the lower the velocity of gazes. This means less torque down low...

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