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Carburetor synchronization tuning
Posted: Thu Jun 18, 2020 6:05 am
by q10115
What RPM do you folks generally synch the carbs at? Idle? 3,000 RPM? 5,000 RPM? I feel a bit of a buzz at the higher RPMs and want to know if throttle balancing could smooth it out.
Thanks,
Roger
Re: Carburetor synchronization tuning
Posted: Thu Jun 18, 2020 8:25 am
by Frank.61
Hi Roger,
Stationairy/idle, it should run as slow as possible (you want to make sure they open the butterfly valves the same amount, hence: synchronisation).
The engine needs to run just on the idle jets!
Make sure everything else like valve play, new air filter, ignition timing or new spark plugs etc. have been taken care of in advance (synchronizing ist always the very last thing in tuning/adjusting after maintenance).
Buzz at higher rpm is most likely something else.
Good luck!
Frank
Re: Carburetor synchronization tuning
Posted: Thu Jun 18, 2020 8:38 am
by Frank.61
guys,
Before anyone is bothered: this is the short version.
Synchronization, the how, in practice depends on carburettor/injection construction and the number of cylinders.
In short, it boils down to the fine adjustment either on the throttle valve adjustment (mechanical) or also via the idle mixture jets (e.g. at the Weber where the butterfly valves are fixed on one shaft).
just for the record ....
Frank