I run a magnaflow /glenwood cam driven water pump and the engine runs fairly cold. Does anyone have experience in limiting the flow on one of those pumps? I made orifice inserts for the discharge side of the pump to limit the flow to the engine, but it doesn't slow the pump volume down enough and water has a slow weep from pump, therefore i dont want to go smaller orifice insert. The engine never gets to a good temp and its a PGF 499 ci motor in a hondo runner drag boat. Does anyone have experience with this? I also heard about cutting every other vane on the impeller....has anyone done this with success.? I don't even run a pump on my kboat I just force feed water from the cave plate pickup, but I want to be able to warm the boat on the trailer at the launch ramp and also idle the boat without burning the heads up, and I am not looking to run a closed system like I have seen on other PGF's.
Any help is appreciated. Thanks