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Did my first carb balance today. Gotta question?


Buckaroo

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I was able to smooth out my engine in the 2000 to 2600 rpm especially. She now runs like a Rolex watch!

Question? I've heard that with the rpm range in the 5200 to 5500 which is typical cruise the butterflies are open so much the carb balance in cruise is a non issue. What is important is proper idle and carb harmony within the lower rpm ranges. 

Is this true??

 

 

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You are correct that once you get up in cruise rpms the balance tube is too small have have any real effect. This is one reason I prefer to sync carbs at idle and 3300-3500 rpm. 3500 is more representative of the fuel / air flow and you are now out of the idle circuit starting to use the main jet. 2500 rpm is still using the idle circuit.  Most that sync down at 2500 will have the sync start to split again at higher rpms.

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