electric water pump
Melting Slicks
Joined: Aug 2000
Posts: 2,618
Likes: 5
From: Overland Park KS
I don't want to hijack here, just wanted to list some other options:
If you do need to replace a water pump the LS3 water pump is a better option for LS1/LS6 owners. The only drawback is it does require you to also purchase a new tstat and tstat housing. The LS3 is 3-4 lbs lighter with less rotating mass. The large bell shaped pulley is replaced with a flattened model.
I recently saw Edelbrock makes a "high flow" water pump for LS1/2/6 motors but I don't know anything more about them...
If you do need to replace a water pump the LS3 water pump is a better option for LS1/LS6 owners. The only drawback is it does require you to also purchase a new tstat and tstat housing. The LS3 is 3-4 lbs lighter with less rotating mass. The large bell shaped pulley is replaced with a flattened model.
I recently saw Edelbrock makes a "high flow" water pump for LS1/2/6 motors but I don't know anything more about them...
Thread Starter
Pro
Joined: Dec 2005
Posts: 621
Likes: 2
From: Stillwater Minnesota
No, LT1's have a camshaft driven water pump. They never had electric pumps from the factory. And I built my LT1 so when I did I put on an Electric Pump. It's been on for over 20k miles no problem what so ever.
The electric pump made a much bigger difference in power than I had thought it ever would. I was curious if the LS1 benefits equally well.
I suppose I'll just put on a stock pump. They're so much cheaper. I was really surprised, the LS1 electric pump was so ridiculously expensive. My LT1 pump was $150. The LS1 electric pump is $600 with the stock one around $150.
The electric pump made a much bigger difference in power than I had thought it ever would. I was curious if the LS1 benefits equally well.
I suppose I'll just put on a stock pump. They're so much cheaper. I was really surprised, the LS1 electric pump was so ridiculously expensive. My LT1 pump was $150. The LS1 electric pump is $600 with the stock one around $150.
Thread Starter
Pro
Joined: Dec 2005
Posts: 621
Likes: 2
From: Stillwater Minnesota
I don't want to hijack here, just wanted to list some other options:
If you do need to replace a water pump the LS3 water pump is a better option for LS1/LS6 owners. The only drawback is it does require you to also purchase a new tstat and tstat housing. The LS3 is 3-4 lbs lighter with less rotating mass. The large bell shaped pulley is replaced with a flattened model.
I recently saw Edelbrock makes a "high flow" water pump for LS1/2/6 motors but I don't know anything more about them...
If you do need to replace a water pump the LS3 water pump is a better option for LS1/LS6 owners. The only drawback is it does require you to also purchase a new tstat and tstat housing. The LS3 is 3-4 lbs lighter with less rotating mass. The large bell shaped pulley is replaced with a flattened model.
I recently saw Edelbrock makes a "high flow" water pump for LS1/2/6 motors but I don't know anything more about them...
Melting Slicks
Joined: Aug 2000
Posts: 2,618
Likes: 5
From: Overland Park KS
Just an fyi....the reason the LS1/LS6 water pumps have that large bell pulley is because it simplified belt positioning by using the same water pump for the Firebird, Camaro and GTO. Some of those engines used two belts side by side on the large pulley and some used a belt on the outer edge of the pulley.
Last edited by KCvetteowner; Jan 11, 2009 at 10:54 PM.
Racer
Joined: Oct 2007
Posts: 333
Likes: 0
From: Western Burbs of Detroit MI
I would not recommend one for anyone on a DD or one that sees a lot of drive-time throughout the year. They are expensive and I don't trust the long-term reliability. The average belt driven pump goes for years and besides, other than the ability to operate it while the engine is off, what real benefit is it to the average street driven car? If it's hp, then there are other (more reliable) ways to gain hp that small.
An ewp frees up parasitic loss thus releasing bound HP, it doesn't actually create any. Seen many graphs showing as little as 3 rwhp 5 rwtq, to 10 rwhp 10 rwtq gains. I don't know for sure about the hp increase but I do know my gas mileage improved.
I would add an ewp and ud pully at the same time and call it the gas mileage combo. I adde about 4 1/2 mpg with the combo on my 346, and re used them on my 402. The 402 gets 27 mpg as long as I keep my foot out of it.
For those concerned about cooling capacity, I say don't worry. I did an extended 20+ mile drive in 85* temps on the highway and my speeds never dropped below 120. My coolant temps never got above 169. I'd say the EWP works. I even plan on reusing it if/when I go FI.
Thread Starter
Pro
Joined: Dec 2005
Posts: 621
Likes: 2
From: Stillwater Minnesota
3 years + with ZERO problems. I call that pretty reliable. Handled the hauls from Detroit to Dallas and Dallas to Detroit with ease. Helped my h/c 346 get 34 mpg actual and on my run from Atlanta to Detroit it kept my 541 rwhp 505 rwtq 402 cool and get 27 mpg.
An ewp frees up parasitic loss thus releasing bound HP, it doesn't actually create any. Seen many graphs showing as little as 3 rwhp 5 rwtq, to 10 rwhp 10 rwtq gains. I don't know for sure about the hp increase but I do know my gas mileage improved.
I would add an ewp and ud pully at the same time and call it the gas mileage combo. I adde about 4 1/2 mpg with the combo on my 346, and re used them on my 402. The 402 gets 27 mpg as long as I keep my foot out of it.
For those concerned about cooling capacity, I say don't worry. I did an extended 20+ mile drive in 85* temps on the highway and my speeds never dropped below 120. My coolant temps never got above 169. I'd say the EWP works. I even plan on reusing it if/when I go FI.
An ewp frees up parasitic loss thus releasing bound HP, it doesn't actually create any. Seen many graphs showing as little as 3 rwhp 5 rwtq, to 10 rwhp 10 rwtq gains. I don't know for sure about the hp increase but I do know my gas mileage improved.
I would add an ewp and ud pully at the same time and call it the gas mileage combo. I adde about 4 1/2 mpg with the combo on my 346, and re used them on my 402. The 402 gets 27 mpg as long as I keep my foot out of it.
For those concerned about cooling capacity, I say don't worry. I did an extended 20+ mile drive in 85* temps on the highway and my speeds never dropped below 120. My coolant temps never got above 169. I'd say the EWP works. I even plan on reusing it if/when I go FI.
Racer
Joined: Oct 2007
Posts: 333
Likes: 0
From: Western Burbs of Detroit MI
I paid 569 or 589 3 years ago, and now I've seen them in the 639 range. Regardless of what people say I like mine. The extra gas mileage I've received has helped offset the cost of the pump as well. Just a quick estimate, probably saved 50 gallons of fuel over the course of 13,000 miles or so. Thats around 150-200 bucks when you factor in that gas was over 4.29 / gallon last summer for premium. A few more years and I break even. I love being able to go on really long trips and only have to stop for gas once vs two or more times. The ewp and ud pully are a big part of why I get such good gas mileage when using cruise control in 6th gear set at 70-80 mph.
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Banned Scam/Spammer
Joined: Jul 2006
Posts: 2,911
Likes: 10
From: Simi Valley CA
Not to get sidetracked here, but isn't it far easier/cheaper to do the "wire under the relay" for keeping your fans on during an auto-x? Heck, you could even do a switch on that same thing and turn the fans on/off manually.
Drifting
Joined: Apr 2008
Posts: 1,316
Likes: 2
From: St. Louis Mo
I used a Meziere Electric water pump on my LT1 and it worked flawlessly, and i now run one on this engine. My temps Never get to 200, even on hot days. I was running it pretty hard the other day and it still didn t get to 200(on the guage, anyway). I like the idea of the few HP and the small MPG gain. Its a chrome one but u really can t see it even when u try to look at it...
. Im all for them, 2 of them and ZERO problems! 
. Im all for them, 2 of them and ZERO problems!
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
I understand it has worked well for you and you seem to have benefited from it, but when the pump does fail the car can't be driven. Do you plan preventative maintenance? I thought Meziere recommended a rebuild on a time/mileage basis?
Just wondering as this has always been something I would like to do but am fearful of getting stuck a long way from home.
Just wondering as this has always been something I would like to do but am fearful of getting stuck a long way from home.
Racer
Joined: Oct 2007
Posts: 333
Likes: 0
From: Western Burbs of Detroit MI
I understand it has worked well for you and you seem to have benefited from it, but when the pump does fail the car can't be driven. Do you plan preventative maintenance? I thought Meziere recommended a rebuild on a time/mileage basis?
Just wondering as this has always been something I would like to do but am fearful of getting stuck a long way from home.
Just wondering as this has always been something I would like to do but am fearful of getting stuck a long way from home.
Meziere may have a schedule or something, but if I knew what it was I have long forgotten it. Post it if you find one.
Drifting
Joined: Jan 2006
Posts: 1,819
Likes: 5
From: Annapolis Md.
I looked into it. Two issues I found were the Meziere pumps 55 GPM (open) which is less than stock at above approximately 5,000 RPM. So if you are pumping less, I was worried about cooling the rear cylinders. Secondly, they don't have a very good reliability for street driving from what I have seen and would worry about getting stuck out on the road.
The pump only had about 10k on it. and the rebuild said cost $ 250.00 +shp. and handling. Well about 3 months and 12hundred miles the sucker started dripping
I have seen mechanical pumps for $125.00 on fleabay with a LIFETIME warranty. Anyway, i still have my pump. it was taken off last week. put on meck. pump. I probably lost 10HP but at least i won't have a garbageMeziere pump. btw. it's for sale !!!! or trade !!!!
Racer
Joined: Oct 2007
Posts: 333
Likes: 0
From: Western Burbs of Detroit MI
I called Meziere to ask them about my elec. water pump... He said i had an early model. cost $720.00 street -- strip version AND it should be due for a rebuild. I liked to ****. Here is a Co. that basically builds water pumps for u to perform at the highest standards and I am due for a rebuild The pump only had about 10k on it. and the rebuild said cost $ 250.00 +shp. and handling. Well about 3 months and 12
hundred miles the sucker started dripping I have seen mechanical pumps for $125.00 on fleabay with a LIFETIME warranty. Anyway, i still have my pump. it was taken off last week. put on meck. pump. I probably lost 10HP but at least i won't have a garbage
Meziere pump. btw. it's for sale !!!! or trade !!!!
The pump only had about 10k on it. and the rebuild said cost $ 250.00 +shp. and handling. Well about 3 months and 12hundred miles the sucker started dripping
I have seen mechanical pumps for $125.00 on fleabay with a LIFETIME warranty. Anyway, i still have my pump. it was taken off last week. put on meck. pump. I probably lost 10HP but at least i won't have a garbageMeziere pump. btw. it's for sale !!!! or trade !!!!
Racer
Joined: Sep 2007
Posts: 369
Likes: 1
From: Calgary AB
I put a 55 GPM meziere on last year. No problems and not noisy. It does flow better below 3,000 RPM. I drive mine on weekends. I believe realistically I picked up 5-7 RWHP. I believe BMW has started manufacturing cars with electric WP's from the factory. No complaints thus far.
