Join Date: Sep 2007
Location: Bracknell Berkshire
156 Airbox quierey
I have just changed my air filter, and for the 1st time noticed that the 'pick up' tube for the air which leads from the top (exit) of the box down to the bottom is slightly 'venturi' shaped, with a 'trumpet' shape on the end, but it is also forming a restriction as its only 35mm across where as the main induction tube is 60mm across.
I assume it has some purpose rather than to simply restrict the airflow...but I can't for the life of me think what it is..?
Any ideas anyone?