LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Electric Water Pump 101

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Old May 31, 2010 | 06:08 PM
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Default Electric Water Pump 101

on my 93 what is involved in modding a pump to be electric? Also.. is it necessary to get into the timing cover and remove gear and shaft or can i mod pump and remove pump to shaft sleeve and be ok? i want to avoid getting into pulling hub and timing cover is what I'm getting @ i don't wana screw with that unless its absolutly required...sugggestions on wiring it in? csr pump on ebay what i want?
thanks guy's!
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Old May 31, 2010 | 06:11 PM
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Wiring is easy, you have to block the waterpump shaft hole on the pump side with a freeze plug and then weld and blocking plate in the timing cover.
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Old May 31, 2010 | 06:35 PM
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Originally Posted by Speed Density
Wiring is easy, you have to block the waterpump shaft hole on the pump side with a freeze plug and then weld and blocking plate in the timing cover.
ok...but that didnt really answer one of my questions....is the timing/water pump gear removal required? if it doesnt reach without the sleeve why must you delete it to do the electric pump mod? isnt that aspect of the conversion unnecessary?
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Old May 31, 2010 | 06:39 PM
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You have to take the internals of the pump out to get an EWP to fit on. And then you have to plug the hole. Leaving the bearing open on the timing cover is ghetto, take the time and do it right.
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Old May 31, 2010 | 06:48 PM
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thanks for your opinion, anyone else have the facts on the WP timing gear?
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Old May 31, 2010 | 07:00 PM
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IMO, the water pump drive should be removed. When it is engaged to the pump, it keeps the drive secure. Without the coupler the gear is free to spin and vibrate with no load isolation. I know some people have left it in there, but I wouldn't trust it. It's just one more piece that can go bad. Mine came right out when I converted.

Also, if you go with a CSR pump, you need to grind four small tabs out of the pump housing. This requires a Dremel or other small grinding tool.
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Old May 31, 2010 | 07:20 PM
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Originally Posted by RamAir95TA
IMO, the water pump drive should be removed. When it is engaged to the pump, it keeps the drive secure. Without the coupler the gear is free to spin and vibrate with no load isolation. I know some people have left it in there, but I wouldn't trust it. It's just one more piece that can go bad. Mine came right out when I converted.

Also, if you go with a CSR pump, you need to grind four small tabs out of the pump housing. This requires a Dremel or other small grinding tool.
So in your theory does the drive pin just pull out and then hole can be JB welded with a quarter like i've read or does the timing cover have to come off to accomplish this mod? ..i'm hoping to stay outta timing cover untill i mess with cam or efi24x mod...
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Old May 31, 2010 | 07:24 PM
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stop being lazy, do the mod right or don't do it at all. When it comes to cars if you half *** it, it wont work right. Take the timing cover off and remove the gear, be careful of the oil pan gasket.
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Old May 31, 2010 | 07:59 PM
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The timing cover needs to come off to get the drive out. It is held in by two bolts.
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Old May 31, 2010 | 09:51 PM
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Yep take off the timing cover and remove the water pump drive gear which is held in by 2 torx 30 heads. Then install in reverse order.
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Old May 31, 2010 | 10:03 PM
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I didn't do anything with my timing cover when I swapped to an electric pump a few weeks back......just figured the drive pin had it sealed up with the factory set-up so why bother plugging it?? Looks like I may have been wrong. Now I'm not sure if I want to tear back into everything (risking getting the opti wet is one reason) or just leave it alone. I guess if I leave it and something fails.....that would be a good excuse to do cam (and heads?)
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Old Jun 1, 2010 | 10:37 PM
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what exactly do i need,and need to do top the pump to make it electric...and does anyone have any solid gains from it?...like...better throttle response? quicker revs? a few extra horses with proof?
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Old Jun 2, 2010 | 01:06 AM
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uhh well first you need a electric waterpump, new is around $350sh. if you search you will find you pick up a good amount of hp in the high end. as its less load on the top end.
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Old Jun 2, 2010 | 01:14 AM
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EWP's are way over rated. You can get more power for your money and have a more reliable setup with the stocker.

That's JUST my opinion though. Take it however you will. I run the stocker and could probably make 10 more hp on the dyno with an electric, but mine is reliable. Almost every one of my friends with an EWP has had problems with them, no matter the brand. Wire comes loose and overheats your car, etc.

It only takes one mistake with an EWP to destroy an expensive engine, or at the minimum warp heads / blow head gaskets.

Not worth it to me.

Some people have no issues at all though. Just make sure you do a good job wiring it up, use a relay, weather sealed connectors, etc. And wire up a status LED as well so you know if it is working or not.

Last edited by gregrob; Jun 2, 2010 at 07:13 PM.
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Old Jun 2, 2010 | 06:21 AM
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I've ran an electric pump for 6 years and never removed the drive gear. Never had an issue.
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Old Jun 2, 2010 | 03:45 PM
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Originally Posted by defaultexistence
thanks for your opinion, anyone else have the facts on the WP timing gear?
Originally Posted by RamAir95TA
IMO, the water pump drive should be removed. When it is engaged to the pump, it keeps the drive secure. Without the coupler the gear is free to spin and vibrate with no load isolation. I know some people have left it in there, but I wouldn't trust it. It's just one more piece that can go bad. Mine came right out when I converted.

Also, if you go with a CSR pump, you need to grind four small tabs out of the pump housing. This requires a Dremel or other small grinding tool.
yea i ran my ewp on my 355 with that little gear stickin out spinning on its own for about a year....i just didn't feel like taking that whole damn thing apart for that lol........it won't give you any trouble.......but if you do decide to plug it you dont have to weld it......i tapped the hole in mine with a 1/2 NPT and then just siliconed and threaded a 1/2 NPT pipe plug into it.....it works mint!!!! and its easy........
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Old Jun 2, 2010 | 03:56 PM
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i love mine had some problems with it at first bc the guy that wired it up (2 wires) just twisted the wires together and i didn't know it so my car overheated, but now i have it soldered up and never had a problem with it since, but i would put a led light on it so you know its working for sure, and i have my EWP wired up to come on when the key is turned forward so its on all the time.
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Old Jun 2, 2010 | 05:55 PM
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i've been running a CSR for a long while but it finally took a dive the other day. I purchased a Meziere heavy duty. but i see the motor is a lot bigger than the CSR and looks like i'm going to have to trim back the fan shroud. anyone ever installed the heavy duty pump on a camaro? i heard it's easier on the impala's and such. Just wanted to get some info from someone that's installed one

Sean
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Old Jun 2, 2010 | 07:07 PM
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Originally Posted by gregrob
EWP's are way over rated. You can get more power for your money and have a more reliable setup with the stocker.

That's JUST my opinion though. Take it however you will. I run the stocker and could probably make 10 more hp on the dyno with an electric, but mine is reliable. Almost every one of my friends with an EWP has had problems with them, no matter the brand. Water comes loose and overheats your car, etc.

It only takes one mistake with an EWP to destroy an expensive engine, or at the minimum warp heads / blow head gaskets.

Not worth it to me.

Some people have no issues at all though. Just make sure you do a good job wiring it up, use a relay, weather sealed connectors, etc. And wire up a status LED as well so you know if it is working or not.
EWP becomes a good bang for the buck when you are doing a cam swap since you can use a regular old SBC double roller timing chain instead of an LT1 specific timing set. for the price savings of the timing chain I paid for my EWP...... (saving cost of regular water pump )

I have been running the same Mez HD on my car (MY daily driver) since march 2006..

I've besided my daily commute I've gone on road trips IE 500-1500 mile long high speed blasts...

So if you wire it properly and maintain your car an EWP should be NO PROBLEM....

But once again I went with an EWP IOT use a double roller timing set up. I did not feel that the single row chain would hold up over the long haul with my aggressive driving style....and 6900+rpm shifts.....

Mike

Last edited by aboatguy; Jun 2, 2010 at 07:12 PM.
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Old Jun 2, 2010 | 07:11 PM
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You saved $300 by using an sbc timing set?
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