Blueprint 408 cooling system questions.
Not so fast.
Not sure where underdriving the water pump came up ?
That wasn't where I was going with this.
The 6 vane pump is actually an AC pump, which uses a smaller AC pulley.
The 8 vane pump is a Non-AC pump, which uses a bigger Non-AC pulley.
The problem is running an AC 6 vane water pump, on a
Non-AC car. Parts suppliers sell them all the time, and unsuspecting people just bolt them on. Less flow and hotter temps will result from doing this.
That's why I brought this question up.
What pump is on the motor ?
Maybe BP didn't supply the WP ?
I wasn’t suggesting what the OP has, or doesn’t have for a water pump.
I brought up pump speed because it’s damned hard to find overdriven water pump pulleys in the aftermarket, and guys love that shiny ****.
I’m only at 3% over, and I’d rather be at 18% over. March Performance wants a 100 bucks per pulley with a 15 minimum order to build a water pump pulley that is 18% over their crank pulley.
I’m considering doing it, but I’d use one pulley, my buddy one pulley and I’d be sitting on 13 pulleys.
Convincing guys that water pump speed is critical and that saving a few HP under driving the pump will cost way more HP in not controlling engine temp.
Any decent street performance engine should never see the high side of 180, except maybe at stop lights and such, and 160 is better. You can’t get much lower and still have a defrost.
The leakage around the fins is a bigger deal than how many fins you have. There is a reason why Milodon only uses 6 fins on their pumps. IIRC, part of it has to do with RPM and cavitation. I may be wrong on that, because it’s been so long since I discussed it with them.
