Electric Water Pump or Stewart high eff????

[lincolnpimp]

Which one guys?

[Blackmobile]

Which one guys?

Go electric, all the cool guys did. :beatnik:

[lincolnpimp]

gotta be cool!

[Blackened300a]

You can spend $350 for basically a electric motor which if it fails, it will overheat and terminate your engine. Or you could spend $150 and have a mechanical pump which will still circulate coolant even if the seal fails. The Electric pump claims to give back 10-12 HP to the engine where the EMP pump claims to only use only 3HP from the engine. If this is true then you can expect 7-9 HP from the EMP pump.
I have the EMP pump and Im happy with it. There are members that stand by their electric pump as well so it comes down to personal preference.

[sd8683]

I love my EMP

[2,4shofast]

I like my electric, you can always wire a dummy led incase it does cut off you will know and you wont have to worry about overheating. And lets face it, 3hp is 3hp.

[J D]

Go with Stewart! If electric water pumps were bullet proof, they'd be standard on sports cars across the board. But they aren't and you WILL find MANY members who've lost thier engine when their electric failed long before it was rated. Upgrade without having to worry, stay mechanical, and pocket the extra cash saved for bigger mods! :cool:

In the end it is a personal choice, whether you're an all or nothing guy, or if given a choice you would play the sure thing.

Oh and no matter which you choose, its gonna be a ***** to burp the system and get the air out.

[Blackened300a]

I like my electric, you can always wire a dummy led incase it does cut off you will know and you wont have to worry about overheating. And lets face it, 3hp is 3hp.

The EMP pump only uses 3HP. So if the Electric pump give you back 10-12HP because the engine isnt turning it then that should put the EMP pump giving you 7-9HP. I havent dyno tested it and we are still waiting to find out if someone has.
I personally think its too much work having to run a light and extra wires just for a water pump install.

[Marauderjack]

What's wrong with the stock pump??:confused:

Mine made it about 125K miles when I changed to the EMP.....the OEM was still fine and I cannot tell of any improvement with the EMP....temps still exactly the same according to my ScanGauge!!!:shake:

Save your $$$$'s for something else!!:beer:

[Cobra25]

I've used the Electric Water Pumps for over 4 few years now. replaced one pump after 2 years , Im on my second. My Marauder isn't a daily driver so for me the electric is fine. You gain a little H.P. and the car run's a little cooler. Also if you race the car it is good at the track because you can turn the key on and run it too cool the engine down. If mine was a daily driver I'd put in the Stewart because it will last longer and is more reliable.

[Bradley G]

Mechanical for me when it's time for a new water pump, what can I say? I'm old school!

[BlownMerc]

Oh and no matter which you choose, its gonna be a ***** to burp the system and get the air out.

It isn't a pain to get the air out of the system if you fill it per the shop manual. You take the plug out of the head-to-head crossover, take the degas bottle cap off and fill the engine through the crossover opening, not the degas bottle opening. Once the coolant level reaches the full line on the bottle, put the cap on the bottle and continue to fill through the pipe until full. You might still have a little air trapped, but it won't overheat while driving allowing the thermostat to open and purge the remaining air into the bottle.

[magindat]

I've used the Electric Water Pumps for over 4 few years now. replaced one pump after 2 years , Im on my second. My Marauder isn't a daily driver so for me the electric is fine. You gain a little H.P. and the car run's a little cooler. Also if you race the car it is good at the track because you can turn the key on and run it too cool the engine down. If mine was a daily driver I'd put in the Stewart because it will last longer and is more reliable.

That's a perfect answer.

I've helped install 4 stewarts and love them and everyone who got one sloves em. Jeff Caannull, while not a vendor has donated 2 pumps to us for raffles in the past. It's a good product and they run a good business. It's 150 bucks VERY well spent.

[2,4shofast]

The EMP pump only uses 3HP. So if the Electric pump give you back 10-12HP because the engine isnt turning it then that should put the EMP pump giving you 7-9HP. I havent dyno tested it and we are still waiting to find out if someone has.
I personally think its too much work having to run a light and extra wires just for a water pump install.


That is what I said...3hp is 3hp. Wiring or not at the end of the day when my car is making more hp that is what matters to me.:)

[Zack]

I have to agree that the stock water pump is fine.
If I could go back in time, I would have never wasted a dime on a water pump of any kind other than OEM.

[Marauderjack]

I have to agree that the stock water pump is fine.
If I could go back in time, I would have never wasted a dime on a water pump of any kind other than OEM.


+10^^^:rolleyes:

[MarauderTJA]

+10^^^:rolleyes:

What Jack and Zack said^^^^^^^^^I have always used stock Ford water pumps w/o ever a problem.

[J D]

It isn't a pain to get the air out of the system if you fill it per the shop manual. You take the plug out of the head-to-head crossover, take the degas bottle cap off and fill the engine through the crossover opening, not the degas bottle opening. Once the coolant level reaches the full line on the bottle, put the cap on the bottle and continue to fill through the pipe until full. You might still have a little air trapped, but it won't overheat while driving allowing the thermostat to open and purge the remaining air into the bottle.

Which is exactly what we did when it was installed, but it still happened.

But although it did also make the underdrive pulleys feel even better, I gotta agree with zach that I could held off on it till the stocker went bad or it was time to replace it, AND THEN have gone with the Stewart.

[Wires]

Just one or two questions:

If the electric pump only uses 3 HP, how can it be correct that the mechanical pump uses 12? If the electric pump only takes 3 HP to move the water, does it really take 12 HP for the mechanical pump to do the same thing? Is the mechanical pump really that inefficient? (4X?) That's a lot of heat. The power to the electric motor is easy to determine, but the power used by the mechanical pump is difficult to measure. A dyno run can vary by up to 10 HP between different runs (That's less than 4 percent accuracy for 300 HP, it gets tighter for higher horspower engines) so I'd take a Dyno reading A minus Dyno reading B with a grain of salt. It's just a wild guess, but I can't see a mechanical pump using much more than about 3-5 HP. Moving water with an impeller is the same whether it's the belt driving the impeller or an electric motor - I can't see any reason for a significant difference. (EDIT: I just thought of one. The electric motor runs at a constant speed, the engine will vary. So, it seems reasonable that the engine turns the pump too fast for over half of the time, as there must be a minimum flow too cool the engine. So I guess the average HP could be much higher for the mechanical pump.)

Second: for anything other than driving down the track with the alternator disconnected, the electric pump will take power from the engine via the alternator. (I understand that for one pass, you can run from the battery and thus save that HP for the wheels)

Alternators aren't 100 percent efficient, the last alternator data I looked at indicated they were about 50-60 percent efficient. So, that 3 HP electricpump costs you about 5-6 HP.

If it's true that the mechanical pump uses 12 HP, then your ahead, even running it all the time. If the mechanical pump is more like 5 or 6, then you're breaking even. If the mechanical pump is around 3 or 4, you're losing HP on a daily driver.

Plus, 5 HP at the strip is a lot - but you aren't going to notice it on the street. (Butts aren't that precice)

Just trying to learn something, here.

[RF Overlord]

Before you decide between electric or mechanical, read this (http://www.mercurymarauder.net/forums/showthread.php?t=47337&highlight=meziere).

Admittedly it's just one guy's experience, but assuming he's not making it all up it's pretty gruesome.

[red]

I have my EMP/Stewart for sale. See here (http://www.mercurymarauder.net/forums/showthread.php?t=48520).

[GreekGod]

...when marketing a replacement part that costs more than an OEM part, it needs to be hyped, whether or not it actually does what they claim it does.

Horsepower claims can be like octane booster claims, figures don't lie, but liars sure do figure.