Is it worth doing? Just wondering if taking the load off the engine will give me that much of a gain or if im better off putting my money somewhere else first? http://store.summitracing.com/partde...5&autoview=sku

 

 

More people are running them now, I think I
might give it a try soon but go with the 55 gallon
output

 

There's positives and negatives to the electric pumps. Personally I'm running an electric and there are 2 things I really like about it. It pumps at full flow ALL the time, not just WOT. And I can run the pump with the motor off to help cool it off while drag racing. The extra freed h.p. is just a bonus.

 

Wow didn't even think of that !

 

What about combining that with an underdrive system?

 

Guys...... never forget one thing:

The energy is NEVER for free !!!!

The electric water pump is very good for dragracing..... where you run your engine for a limited time..... and even you can take away the belt of the alternator, due to the fact that the battery will be able to supply energy to the engine for the time you need.!

But..... but !

In normal use you need to keep charged your battery and the current absorbed by the elecric pump HAVE TO BE PRODUCED by the alternator.... or you will totally discharge your battery.

Assuming the belt driven pump will drag some 1-2 Hp (no more, belive me..... otherwise you should need belts like a blower).... in order to have the same water flow the electric pump have to drag the same energy..... let say 1.5 Hp

1.5 Hp = 1125 Watts (1Hp is roughly = 750 Watt)

1125 Watts at 12 Volts = 93.75 Amps !!!!!!

Are you shure that your electric pump is pulling 93 amps from the battery???

Tipically we can tell about 25-30 Amps.... wich is equal to nearly 0.5 Hp.

We have two options:

1) the electric pump is flowing a lot less water than the belt driven...
2) the belt driven pump is consumig a lot less power then they claims.

In both conditions, for my opinion, unless you only dragace your car, it's totally wrong to use an electric water pump in a street car.

Futhermore the electric pump is flowing a lot more water than the belt driven one when you really don't need...... AT IDLE !
...and is flowing a lot less water when you should need big flow... AT WOT !

Finally my opinion:

Very good if you only dragrace with your car....
Very bad in all the others condition.

Just my two cents...

 

I was seriously considering an electric as I was upgrading my rad with an aluminum with dual spals and a 135 amp alternator anyway. I opted for a Stewart Sage II H2O pump instead. My engine in at best mildly modified so didnt think I wuld be losing much for a weekend driver with a mech pump. Semper Fi Bob

 

It is a universal law. Nothing is free. That pump gets it's power from a battery or alternator which takes some power from the engine which gets its power from the gas which gets its power from a dead T-Rex 100 million years ago who got it's power from another dinosaur the T-Rex ate which got it's power from eating some green leaves which got it's power from the sun which got it's power from gravity which got it's power from the big bang theory, which got it's power from god somewhere down the road. .................Our cars are powered by God! I never knew that. Thats why they're so special!

 

I put an electric water pump, electric fuel pump, and eletric fans on my 68. I have experience nothing but good looks and performance.

 

I disagree with one of your points. Not needing better flow at idle. Let's be serious here, you don't need an electric pump on a stock motor. We should be talking about modified, high hp motors. A lot of these problems can have some of their most damage at idle sitting in traffic. Unless you are road racing you aren't going to see WOT for very long periods but you are going to see idle, if driven on the street, a lot. So, at least to me, having more flow (hence, better cooling) at idle where there is air being pulled through the radiator only by a fan is very beneficial.

You are right though, nothing is for free. You aren't negating all the hp it takes to turn a mechanical pump. I have however seen many tests showing that an electric pump does free up some horsepower. Might not be enough to justify the cost, but that's for you to decide. I can't believe though that a mechanical water pump and fan only take 1-2hp to drive so you should have more hp to gain.

 

That's what the manufacturers of electric pumps and fans hope you (can't) believe also. If everone sat back and thought about the something-for-nothing arguments, nobody would buy them.

 

for some perspective: an average fit young man pedelling a bicycle driving a generator can make maybe 0.08 hp for 30 secs at most. that's enough to light a 60W bulb, sorta, most can't keep it lit brightly.

 

I've been running a Meizere eletric pump on the 73 for 3 yrs now with no problems on the street and noticed the the sotp feel the very same day I installed it.
But if your car is stock and you don't want a little performance the mechanical pump is fine.
If the pump shoots crap which one would you want to have ?
Electric $350-450
or mechanical $30-45.

 

You seem to be stuck on hp gains what about better cooling

 

How much does a standar pump flow at max. (for me that is only 5500rpm)

Youst for looks and cleanlyness i would love to have an eletric pump, instead of a normal belt driven

 

35% more flow than the engine actually needs.

 

I was thinking compared to the eletrical ones.

 

I can't wait to see this car...I've already informed the wife on a family trip down to Jacksonville sometime in Feb...

 

the thing that is forgotten is that the alternator is putting out that 12V at xxxamps when ever the engine is running...the car does not use all that amperage...that is why there is a HP gain droping the extra pulley,,, the Alt isn't working harder, you are just using more of what it makes