Maybe I’m being stupid here, but what’s the advantages of shorter or longer ram pipes?
Fitting twin HS4s so looking for suggestions and options for filtration on a nicely built 1330 fast road engine
Ram pipes , velocity stacks , air horns , trumpets .............
Don’t know much about SU carbs but Dellorto and Weber twin duals use 50mm as standard and its recommended that they are used inside proper air filters.
When fitting shorter stacks it’s generally to go under shorter filters , ie where space is an issue.
Alls they are doing is straightening the airflow into the carb throat and fitting the correct choke for airspeed in combination with the appropriate jetting for your application is what makes the carb work for you.