edsnova posted:I think you're right. I have heard somewhere that Del 45s are closer to Weber 48s than to Weber 44s. Del 40s are more like Weber 44s than Weber 40s. . . . No idea why this would be though.
Because the standard vents are bigger on the Dellorto 45s. Getting bigger vents for the IDF 44s gets them into the same ballpark as the Dellortos.
Bigger throttle plates present their own tuning challenges. Everybody is always worried about "how big" the carbs are, but a smaller carb with a bigger vent is nicer to drive than a great big carb with a small vent. Progression is just easier to control with the smaller throttle plate.