Hi,posted this on the general composites...thought it might suit better here.

Hi
Id like to know what are the main differences between using a venturi vacuum system and a pump sistem.
Purchasing a venturi one seems cheaper(already have a good compresor),but Id like to know what is the downside if there is,and its limits.
We are focusing on small bycicle parts,no infusion.
Thanks in advance.

A vacuum pump will produce better vacuum and for longer.  A venturi doesn't pull deep vacuum  like only 25 inches of HG (i am american .8ish bar I know we use a horrible system)  They also cannot be used for long duration of time like pulling vacuum overnight. IMHO Pay a little more and get a dedicated vacuum pump.