anyone remember the velocity stack it was like a big funnel to put on top of your 4bbl carb.I made one for my hsf fan it lowered my temp by 2 degrees.hope this helps some one,maybe now I need headers? patent applied for & pending
I don't know anything about hot rodding. You mean you put a funnel going to the fan? How wide is it? How tall is it?
It could be it is pulling in air that is a little cooler because it is a little distant from the hot outlet of the HSF, and forcing the hot air to go further before it re-enters the inlet, so diluting the heat.
I think some fellas have done this with old vacuum cleaner hoses for ducting. Basically done by drawing in the air directly from the outside of the casing. It's somewhat effective if you have anemic case ventilation.
actually used the bottom of a plastic cup same diameter of fan and about 1.5 inches high it is a little wider at the top, i believe it pulls in cooler air instead of recirculating air by the hsf. I think i need to change one of my fans near cpu and make it exhaust instead of pulling air in.I have 3intake &1exhaust +the psu fan blowing out.