To get on with my idea…
I've considered finding a smaller diameter pulley to increase the shaft RPMs of the water pump.
Some basic math:
![Huh? :huh:](./images/smilies/dunno.gif)
Ratio = Crankshaft Pulley Diameter/ Water Pump Pulley Diameter
Rotor RPM = Pulley Ratio x Engine Speed
So If you take a main balancer pulley diameter of 6.5" +/- that is rotating @ 700 RPMs attached to a secondary pulley that is 5.4" +/- in diameter. The water pump shaft will be rotating @ 842 rpms. I would like to see a 200-300 +/- rpm increase @ the water pump, approximately 1100-1200.
Reverse:
![Huh? :huh:](./images/smilies/dunno.gif)
Desired Rotor RPM / Engine Speed = Pulley Ratio
Crankshaft Pulley Diameter / Pulley Ratio = Water Pump Pulley Diameter
So, after throwing some numbers around I think hitting the 1200 mark is out of the question (maybe just as much as doing this period). That would require a pulley that would be 3.8" in diameter and without checking, I’m not sure you could fit something that small without modifying the pump heavily. So now I’m shooting for 1100. That would be a 260 rpm increase over stock, and would require a 4.1" pulley. This would put me closer to the range that I see the temperature start to steady out. It would be as if my engine was idling @ 960 versus the 700.
I'm sure the High flow pump that is sitting on the stroker will help out in the future but I would really like to stabilize the temps at lower rpms and lessen the time that my fans are on.
Question:
1. Has anyone done something along these lines
3. I'm going to assume that a 200-300 rpm increase is nothing to worry about on a stock redline engine. Would this be something you guys would be concerned with?
4. Does anyone have any idea of a pulley that might be a good start? Something roughly 4.0 - 4.3" in diameter, not grooved, and has a nice flat face to work with.