Hi guys.I need your advises, opinions.
Here what I have.
I have drag project which runs its best time 8.94.From Ukraine.
Last season was ok BUT.when the drag run becomes cooling temperature becomes rise so fast.so fast that the cooling fluid throw out to the reservoir for the cooling fluide.
I have little radiator with 1.2 bar cap on it+mounter fan on it.
+I have removed thermostat.thats why it is oem water pump.
some guys tells me that I need to install electric water pump.but where to find it?how to install?
because I saw some topics.
in one topic-thermostat removed+oem waterpump+universal electric pump from the upper exit from the radiator.
from the second topic it was -oem water pump removed-there was some plate instead.but in this case?how this electric pump will wprk ?where to place it?

and if I will install electric pump?will it work great?or may be one pump will prevent the other and than will be big bang?))
may be somebody have link what pump to buy ,which one will be better?
may be somebody have pics of this ?thanks to everyone.

 

There are many evos running under 10 sec 1/4 miles with the oem water pump in the states. It sounds like your vehicle may be overheating. Are you sure you don't have any other underlying issues that you haven't noticed yet? If you are leaking exhaust gases from the cylinder head gasket into the coolant port you would also be boiling the coolant.

I would make sure for certain you don't have any other issues first before looking into the electric water pump route, I don't know of anyone in the evo community that is running it, however I'm sure it has been done by now.

 

It sounds like the car is lifting the head and pushing coolant. What head studs/gasket?

 

studs arp and gasket oem.
but coolant doesnot smells like exhaust gas..
this may be too.may be just to replace the gasket??!?!
may be.
but electric water pump needs too.

 

Why did you remove the thermostat? That may be why your having issues, imo.

 

it was and before removing.thermostat opens not at that time what we need.thats why it was removed.
or how thermostat may cause that problem?explain please.
but I also guess that the problem will resolve with changing of the head gasket...

 

The exhaust will not smell like coolant if it it only lifting the head under boost.

The cylinder pressure is getting into the cooling system, it's like a one-way valve.

 

If the thermostat didn't open as per oem specs then your old thermostat was bad. You should have replaced it with a new, properly functioning one and then see if you were still having issues.

Completely removing the thermostat allows the coolant to flow through the system unrestricted. This can make your car not warm up fast enough and on that same note also make your car overheat. One function of the thermostat is that its there to keep the coolant in the engine until it warms up, to make sure the engine warms up to temps quickly.

Once its warmed up, if the thermostat isn't in place, there is no restriction so the coolant flows too quickly and doesn't efficiently draw out heat from the system and cause overheating. In race cars when they remove the thermostat they place a washer with a restriction that simulates what the flow would be with a fully open thermostat. This is not the same thing as just removing the thermostat.

 

Yes u need the thermostat, or washers to restrict the flow or drill some holes in the oem thermostat. The best electric water pump that I could see working in a evo is The Stewart emp electric water pump, it's a inline unit we have one on our drag camaro and it's more then worth what it costs.

 

Increasing the rate of coolant flow through an engine actually increases cooling. This is true up to almost impossible flow rates where water friction will produce heat. This has been argued and discussed by engineers on other boards. The idea that coolant flowing without a thermostat cannot pick up heat is an old wives tale.

The problem with no thermostat is less pump head and hence a greater possibility of pump cavitation. Well, another problem with no thermostat is that it takes longer for the oil to attain the proper viscosity for lubrication.

Thinking about it, if you had a thermostat fail in the closed position then you may well have warped the head.

 

I'm about to remove the impellor from my OEM pump, remove the thermo stat and run a Davies Craig electric water pump inline in my bottom hose controlled by a Motec DHB so I can control pump speed.

All for the same reason you're considering this idea.

 

I still believe the is having some type of head/headgasket failure from what he is describing especially if the vehicle has overheated prior to him removing the thermostat.

 

Yep agreed, also he has a half radiator not sure if he has a fan or not, and how long does he let it idle for. I would not get a half radaitor cause i DD my car and im sure it would over heat in traffic, also i like my AC.

 

this is not every day car))
this is drag weekend car.
it goes to drag weekend 5-7 times per year))
yes i have a half of radiator but there installed fan.



ps
I decided to take off cylinder head and to see what with the gasket there.
and also electric pump was bought Davies Craig epw80
80l\min
i think great will be)when i will see something with the gasket will post here

 

problem was fixed with installed new head gasket.and also was installed water pump.works great.at the highest rpm it shows me only 87c temp .looks like great.
thanks to all.