Which one flows better, factory 6 blade water pump or 8 blade
I'm aware the so called A.C. pump has 6 blades while the non A.C. has 8. It would seem the 8 would move more water hence a cooler running engine. Seems like the air cars would need the better flowing unit. Also the Mopar bible recommends the A.C pump for a HP build, stating less drag. What gives?
Here's the deal with the water pumps. Cars with lots of accessories like AC got the 8 blade water pump because those engines were dragged down and got a little warmer running all those accessories at idle. Mopar performance recommends use six blade simply because there's less drag and they don't expect you'll be idling much. If you have a hot Street motor strip motor and you're driving around town you're really going to want the 8 blade pump because if you do any kind of sitting in traffic drive-thru your motor is going to get a little warmer than norm.
The other thing to consider is that Mopar and they're testing came up with an idea that the eight blade might cavitate at really high RPM. I run the eight blade myself and have no issues running it at high RPM ...and you really don't stay up there long , so it's not an issue. That was more of a racing thing.
Six blade, I have no use for them.
8 blade for street strip.
Add the anti cavitation plate version for constant high rpm..or buy the milodon,jegs,flowcooler.. etc version.
And a caveat to that is you can run a 6 Blade with a plate and probably push about as much water as a regular 8 blade.
You can do it a couple different ways.
Parts store 8 blade-cheapest.
Jegs 6 blade w/anti cavitation plate-70.00 iirr.
Milodon and the rest are the more $$.
All you need.. is what works.
Mostly is lack of enough low rpm clooant flow that's the issue.
