Is anyone using one of these with a serpentine pulley setup? Under the application on summitracing it says, "Not for use with serpentine drive systems." Anyone know why?
Meziere Eletric Water Pump- WP311S
- Thread starter Gailahan
- Start date
It's as electric driven pump so the direction of rotation of the stock pump has no bearing on it...all you would need to do is reverse the polarity to reverse the pump. The reason they won't work on a serpintinne belt set-up is because there is no way to route the single belt without driving the pump. A co-worker put one on a FF Cobra kit car with a late model 302 and he had to build custom brackets and pulleys to bypass the pump.
He likes it but I think it's just another more complex piece to have trouble with. BTW, he carries a spare. Just in case.
And do you really need the extra ??-hp savings at higher rpm? On a street car.
He likes it but I think it's just another more complex piece to have trouble with. BTW, he carries a spare. Just in case.
And do you really need the extra ??-hp savings at higher rpm? On a street car.
You can't just simply reverse the polarity to reverse an electric water pump. The shape of the impeller has more to do with the flow, you'd also have to change the impeller to make it work. Changing the impeller's rotation gets you reduced flow and a lot of cavitation. And then depending on what year timing cover you have, the cover's ports are also reversed from a std rotation cover.
iskwezm
10 Year Member
iskwezm
10 Year Member
blown65
Founding Member
I have one, not exactly the same as those but I just built my own bracket. (mines the 55gpm model)
My car wont even go over 160 on a hot day.
My car wont even go over 160 on a hot day.
Why does it matter which way the pump rotates if it is an electric pump? I thought the only time it matters is if you are doing a V-belt or serpentine setup with a mechanical pump.
The kit he used is an electric motor that drives the stock pump via a toothed belt. And it didn't cost $500.00. More like $75.00...I'll sk min in the morning the brand, cost and supplier.
I still don't think it's worth the extra work and possible trouble.
What matters is the direction the impeller is designed to turn. If the shaft is turning the opposite direction the impeller is designed to move then you have a horribly inefficient pump and it will most likely cavitate.
Why would the shaft be turning the opposite direction that the impeller is designed to on an electric pump? Improper wiring? Is there anything on the engine that determines which way the pump should rotate, or is it just determined by the type of waterpump and the way the belt should be routed? For example, does the timing cover determine which way the pump should rotate? The reason I ask is I have a late model 94-97 351w block. If I were to use a standard rotation waterpump would I also have to change out the timing cover to an earlier version that used a standard rotation waterpump?
I thin kyou missed the D man's post earlier. Read the last sentence of his post.
I guess your either not reading what's been posted on this subject or simply not comprehending. 
Most 12V motors can be reversed just by swapping the wires. A 94-97 timing cover from a roller 351W will have a reverse rotation timing cover. To get the maximum flow, you need a reverse rotation pump to go with it.And a std rotation pump will not bolt onto it anyway, the gasket faces are also reversed, it will bolt on, but it'll leak like a sieve due to the gaskets not sealing(I think, I've never tried this, only going from looking at the two different designs, I have all this stuff hanging around in my shop. The late 80's pumps both look the same from the front, but when you compare them from behind, you'll see the difference. Now, depending on the impeller design in the pump, it may or may not flow properly in either direction (I'm thinking about that $500 pump posted above) The impellers in the stock pumps only flow correctly in the direction they're designed to.All I wanted was a clear answer leading me to the conclusion that in order to run a standard rotation electric waterpump (standard rotation in regards to the impeller, I realize that the motor can be reversed by switching the polarity) on my latemodel 351w block I would need to use an early model timing cover. I have read and comprehend everything that has been posted in this thread. I just want to be sure of what I'm doing before the fact. Does that seem so silly? All I wanted to verify is that there is nothing internal to the engine that determines which rotation water pump you should use. So, the only markers to determine which rotation the waterpump should be turning are:
1. The Impeller
2. The Timing cover
Just because something is labeled as a serpentine setup does not mean that a reverse rotation water pump is necessary. The fact that the WP311 water pump is stated as not working with a serpentine belt system has nothing to do with rotation and everything to do with the routing of the belt. This is what mikethebike stated earlier. However, a standard rotation electric water pump cannot be reversed by simply switching the polarity to the motor as the impeller will then turn in the wrong direction. The only obstacle to mounting this pump is the way that the late model timing cover routes the water in the direction that a reverse rotation pump would flow. This problem is averted by switching the timing cover to an earlier model. The routing of the accessory belt is accomplished by using a two belt system. One belt turns my power steering pump while the other turns the alternator. Thank you all for the help and I greatly appreciate it.
1. The Impeller
2. The Timing cover
Just because something is labeled as a serpentine setup does not mean that a reverse rotation water pump is necessary. The fact that the WP311 water pump is stated as not working with a serpentine belt system has nothing to do with rotation and everything to do with the routing of the belt. This is what mikethebike stated earlier. However, a standard rotation electric water pump cannot be reversed by simply switching the polarity to the motor as the impeller will then turn in the wrong direction. The only obstacle to mounting this pump is the way that the late model timing cover routes the water in the direction that a reverse rotation pump would flow. This problem is averted by switching the timing cover to an earlier model. The routing of the accessory belt is accomplished by using a two belt system. One belt turns my power steering pump while the other turns the alternator. Thank you all for the help and I greatly appreciate it.
Here's what will happen in your pump rotates the wrong way...I know about this because GM installed a ton of standard rotation pumps (pushes water through the block first) on their 4.3 v-6 engines that should have been reverse rotation pumps (pushes water through the heads first) in our company vans .....your heater will not work worth a damn and your engine will always be on the verge of overheating.
By Jove, I think he's got it
