electric water pump help! - Toyota Yaris Forums

mandriu · 07-16-2007, 04:49 PM

Well I decided on the Meziere wp136. it's "universal". The problem is that I don't know which direction the coolant flows. From the lower hose to engine or from engine to lower hose. I will be putting it in this weekend, but don't know which direction.

I appreciate any help.

cdydjded · 07-16-2007, 05:11 PM

Why would you spend you $$$ on that?

Shijima · 07-16-2007, 07:30 PM

Im assuming so he has one less thing for the engine to move.

joey1320 · 07-16-2007, 07:47 PM

hot coolant goes thru the thermostat into the radiator. so if the lower hose has the thermostat(?) then is from the hose to the engine. if its on the top hose then from the engine to the hose.

http://auto.howstuffworks.com/cooling-system2.htm

and why are you doing this again? to free up some horsepower and better fuel economy???

mandriu · 07-17-2007, 12:20 AM

joey1320

I was kind of thinking that but didn't want to dive in.

So far I have about $230.00 invested in the project. There are a number of Electric water pumps. all over $170 I really think that taking the water pump off of the belt will free up 1-5 whp. btw, that is about the price of a good cai. The only real concern i have now is that there will be about 1" of clearance on all sides.

churp · 07-17-2007, 01:17 AM

Usually the hot coolant from the engine always goes to the top of the radiator....this is because the hottest coolant stays in the top of the radiator(hot liquid lighter than cold), as it cools the liquid sinks to the bottom of the radiator and returns to the engine. Can't recall seeing it any other way.

mandriu · 07-17-2007, 01:30 AM

The Thermostat is on the lower hose. per CO-17 yaris manual here at yarisworld. That is what is confusing me. I guess on saturday after About one beer I will remove the upper hose at the radiator and crank the engine to see which side spews. then adjust accordingly

eTiMaGo · 07-17-2007, 02:29 AM

Quote:

Originally Posted by mandriu

The Thermostat is on the lower hose. per CO-17 yaris manual here at yarisworld. That is what is confusing me. I guess on saturday after About one beer I will remove the upper hose at the radiator and crank the engine to see which side spews. then adjust accordingly

Yeah that's what I see from the manual too, the inlet to the pump is there, so you should just trace the hose to see where it's connected to...

joey1320 · 07-17-2007, 07:56 AM

good luck with the project. keep us updated.

03Z33 · 07-17-2007, 10:29 AM

I'd consider running some kind of warning light into the cabin to let you know when the pump is actually running, just in case it stops working for any reason.

PetersRedYaris · 07-17-2007, 10:50 AM

Every car I have ever worked on dumps hot coolant out the top hose and pulls cooled coolant in through the bottom hose. I guarantee it is the same on the Yaris... Toyota puts the thermostat on the engine side of the lower hose on many engines, but they still flow the same direction.

mandriu · 07-17-2007, 10:56 AM

that's a good idea about the warning,Maybe some kind of L.E.D. on the circuit. I am pretty confident that the pump will function fine. The only reason I say this is that the pump company is known in the Hot rod market to work.

WRBlue · 07-17-2007, 11:56 AM

Quote:

Originally Posted by mandriu

So far I have about $230.00 invested in the project. There are a number of Electric water pumps. all over $170 I really think that taking the water pump off of the belt will free up 1-5 whp. btw, that is about the price of a good cai.

Then theres the cavatation at high rpms with a belt driven pump. An electrically driven water pump will always cool more evenly than a belt driven pump. A cooler engine performs better than a hot engine (but a hot engine is more efficient with fuel use).

What are you doing about the OEM pump?

As for warning lights... You already have one, the H2O gauge ;)

AlphaFox · 07-17-2007, 12:32 PM

get a scanguage, it will show you actual water temps. cool to watch!

mandriu · 07-17-2007, 02:25 PM

I don't have the scanguage, but i have an obd2 that reads all the good stuff.

This is a more accurate account of expenses so far..

Water pump 186.50
2 x hose fittings 15.99
1 belt 377k4 8.99 (measured with string)
relay mr44 5.99
hose clamps 1.99
wire and ends 10.00

total 245.00 +-change

I will leave the OEM pump in place for now. I will remove the pulley. Later I will purchase a new gasket for a pattern and a sheet of 1/4" aluminum. Then Dremel and drill a cover.

jdium · 07-17-2007, 04:22 PM

Quote:

Originally Posted by mandriu

I will leave the OEM pump in place for now. I will remove the pulley. Later I will purchase a new gasket for a pattern and a sheet of 1/4" aluminum. Then Dremel and drill a cover.

This is a very interesting mod, actually seems worthwhile. As for the blockoff plate, maybe it could be used as your mounting point for the electric pump? Also, a good shop (like the 1 I work at) could make your plate for you very easily. If you have the patience and knowledge to create a good CAM file for what you need, a good sheetmetal shop could pop one out laser cut in minutes...maybe even to stuff like tap and countersink for you...just an idea. And once the hard part is done, you can maybe make some money selling them...

Jerkratt · 07-17-2007, 07:31 PM

i would be interested in this water pump... i dont know if u mentioned the company.. and what type

EDIT: nm first post lol disregard that

AlphaFox · 07-17-2007, 09:40 PM

A dyno before and after would be good, to see if it actually does anything

07-16-2007, 04:49 PM	#1
mandriu 11b1p View User's Garage Drives: yaris s Join Date: May 2007 Location: nashville Posts: 44	electric water pump help! Well I decided on the Meziere wp136. it's "universal". The problem is that I don't know which direction the coolant flows. From the lower hose to engine or from engine to lower hose. I will be putting it in this weekend, but don't know which direction. I appreciate any help.

07-17-2007, 01:17 AM	#6
churp Clean and (dis)Functional View User's Garage Drives: Yaris 2dr--Black Betty Join Date: Mar 2007 Location: Tropical Minnesota Posts: 562	Usually the hot coolant from the engine always goes to the top of the radiator....this is because the hottest coolant stays in the top of the radiator(hot liquid lighter than cold), as it cools the liquid sinks to the bottom of the radiator and returns to the engine. Can't recall seeing it any other way. __________________ ____________ Old School Cobble Jockey

07-17-2007, 07:31 PM	#17
Jerkratt View User's Garage Drives: 08 Yaris Liftback S (RIP 07) Join Date: Apr 2007 Location: Fair Lawn, NJ Posts: 1,378	i would be interested in this water pump... i dont know if u mentioned the company.. and what type EDIT: nm first post lol disregard that __________________ "It hurts more when its wet"

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07-16-2007, 05:11 PM	#2
cdydjded Drives: Yaris LB Turbo Join Date: Aug 2006 Location: Miami FL Posts: 782	Why would you spend you $$$ on that?

07-16-2007, 07:30 PM	#3
Shijima Drives: 07 HB Join Date: Apr 2007 Location: Canada Posts: 110	Im assuming so he has one less thing for the engine to move.

07-16-2007, 07:47 PM	#4
joey1320 View User's Garage Drives: Yaris LB Join Date: Mar 2007 Location: Lakewood, Ohio Posts: 538	hot coolant goes thru the thermostat into the radiator. so if the lower hose has the thermostat(?) then is from the hose to the engine. if its on the top hose then from the engine to the hose. http://auto.howstuffworks.com/cooling-system2.htm and why are you doing this again? to free up some horsepower and better fuel economy???

07-17-2007, 12:20 AM	#5
mandriu 11b1p View User's Garage Drives: yaris s Join Date: May 2007 Location: nashville Posts: 44	joey1320 I was kind of thinking that but didn't want to dive in. So far I have about $230.00 invested in the project. There are a number of Electric water pumps. all over $170 I really think that taking the water pump off of the belt will free up 1-5 whp. btw, that is about the price of a good cai. The only real concern i have now is that there will be about 1" of clearance on all sides.

07-17-2007, 01:30 AM	#7
mandriu 11b1p View User's Garage Drives: yaris s Join Date: May 2007 Location: nashville Posts: 44	The Thermostat is on the lower hose. per CO-17 yaris manual here at yarisworld. That is what is confusing me. I guess on saturday after About one beer I will remove the upper hose at the radiator and crank the engine to see which side spews. then adjust accordingly

07-17-2007, 07:56 AM	#9
joey1320 View User's Garage Drives: Yaris LB Join Date: Mar 2007 Location: Lakewood, Ohio Posts: 538	good luck with the project. keep us updated.

07-17-2007, 10:29 AM	#10
03Z33 View User's Garage Drives: TCR10 Join Date: Jun 2006 Location: SoCal Posts: 1,132	I'd consider running some kind of warning light into the cabin to let you know when the pump is actually running, just in case it stops working for any reason.

07-17-2007, 10:50 AM	#11
PetersRedYaris View User's Garage Drives: 2005 Scion xB Join Date: Nov 2006 Location: The Black Hills of South Dakota Posts: 1,059	Every car I have ever worked on dumps hot coolant out the top hose and pulls cooled coolant in through the bottom hose. I guarantee it is the same on the Yaris... Toyota puts the thermostat on the engine side of the lower hose on many engines, but they still flow the same direction.

07-17-2007, 10:56 AM	#12
mandriu 11b1p View User's Garage Drives: yaris s Join Date: May 2007 Location: nashville Posts: 44	that's a good idea about the warning,Maybe some kind of L.E.D. on the circuit. I am pretty confident that the pump will function fine. The only reason I say this is that the pump company is known in the Hot rod market to work.

07-17-2007, 12:32 PM	#14
AlphaFox Drives: 07' Yaris Liftback - silver Join Date: May 2006 Location: Springfield, Mass Posts: 475	get a scanguage, it will show you actual water temps. cool to watch!

07-17-2007, 09:40 PM	#18
AlphaFox Drives: 07' Yaris Liftback - silver Join Date: May 2006 Location: Springfield, Mass Posts: 475	A dyno before and after would be good, to see if it actually does anything