03-01-2020, 08:39 PM
A standard pump is fine on an unmodified engine but a sports engine with jets drilled out and a filter fitted an overbored pump is a good idea,vane pumps have a limited capacity due to only having one chamber and the more you increase the pressure the more load it puts on the pump. Rotary pumps have multiple chambers increasing the capacity and reducing the load on the pump, the vane pump can make high pressure but the load on the vanes would be more than the pump was designed for as I am sure you are aware of Dave. I know of engines using vane or double vane pumps but personally I would only use a rotary pump on a pressure fed engine. Terry.