car is overheating

[paul67]

Judt thought if the the water pump is not for a LT1 then the water flow is going the wrong way ,but reversing the pump will not cure it as the blades will be wrong for the flow. What is the pumps part number and whats the make.

[lt1chevelle]

its a csr part number:CSI-901LT1

[paul67]

Ive been to there web site and they have a tech number, i would give them a ring as it could be something simple.

[streetk14]

I was thinking the same thing about reversing the pump wires to make it spin backwards, but I think you are correct; The impeller is probably only designed to run in one direction.

If you got a standard rotation electric pump, that could very well be the problem. I'm not really sure what effect having a standard flow pump would have on a motor that has a reverse-flow cooling system, but it cannot be good. Maybe the coolant is trying to climb up the radiator instead of down, causing poor flow and high temps.

Just a thought, but I told you before that I don't know much about LT1 motors in particular.

Andy

[lt1chevelle]

i have the right pump for the car. i had it started yesterday and the upper rad hose gets hotter than the bottom. also tomorrow im going to try and lower the rad. with the lt1 motors you have to run an expantion tank and it has to be higher then the rad. it is higher right now but im going to lower the rad a little bit more anyways. they say if its not high enough you can get air pockets. i really dont think i have any air pockets becuase i can hear the pump pumping the water and see it moving when i take the expantion tank cap off.

[avewhtboy]

take the thermostat out completely and try it and put the thermostat in some water with a thermometer and heat it up to see when it opens. Also what about your fan shroud...some pictures might be helpful

[lt1chevelle]

i dont have a shroud on the car. i think i might order one tomorrow from summit. also if i have my fan on the front of the rad(out side of the engine bay) should it be pulling or pushing air?

take the thermostat out completely and try it and put the thermostat in some water with a thermometer and heat it up to see when it opens. Also what about your fan shroud...some pictures might be helpful

[shep]

If it is outside the engine compartment IE behind the grill but in front of the radiator it should be pushing. That is not the most efficient way for the fan to be mounted. If you have the room move it to the other side of the radiator pulling air.

[lt1chevelle]

things are tight on the other side due to the water pump. i know for a fact that i would not be able to add a shroud if i did move the fan to the other side.

[streetk14]

I don't know the exact numbers, but you lose a lot of cooling efficiency by using a pusher fan (mounted on front of radiator). They will also lose 25% of their flow if a fan that is designed to be a puller is used as a pusher as the blades are usually optimized to spin one direction. You also don't have a shroud you say, which makes the situation worse. I'd like to know what size and model fan you are running. Pics would be nice.

I'd also like to know what the thing runs at @ 65 mph +. That should eliminate the fan from the mix.

Andy

[lt1chevelle]

here you go http://store.summitracing.com/partde...0&autoview=sku

[Charley Lillard]

How many inches from the rad to the water pump ? You need a good fan- shroud combo. What is the timing set at ? Not enough advance will make it run hot.

[paul67]

When you first stat the engine ,keep it ticking over ,and keep placing hand on rad to see if the water is flowing round and not just heat trasfering ,Watch your hands.

[lt1chevelle]

When you first stat the engine ,keep it ticking over ,and keep placing hand on rad to see if the water is flowing round and not just heat trasfering ,Watch your hands.

cant i just turn the pump on? becuase its an eletric pump so turning the motor over would not turn the pump on?

[lt1chevelle]

i dunno what the timing is set at pcmforless did all the tuning so i would have to call them. as for how many in away i would have to look after my class this after noon.

How many inches from the rad to the water pump ? You need a good fan- shroud combo. What is the timing set at ? Not enough advance will make it run hot.

[paul67]

Ok turn motor on then turn pump on , see what happens when putting hand around rad . Do you run engine then turn pump on when engine reaches a certain temp then turn the fan on,

[lt1chevelle]

no i turn the pump on when i start the motor and the fans come on when the car is started.

[paul67]

I'm running the same engine as you i will go and measure my rad back in a bit .

[paul67]

Ok
Alloy rad core dimensions 23" wide,18" high,3" deep.
Tanks LH side 3"x3"x18" RH side 3 1/2" x3"x18"
Fan 16" puller
Lower rad hose which has the thermostate goes to the RH side
Upper rad hose goes to the left hand side.
In front of rad is an A?C consensor ,the rear a trans cooler.
Catch can is the same level as top of rad.
Hope this is of some help.

[lt1chevelle]

ok well i am going to pick and pull (bro blew the rearend in his truck) when i get back ill pull the t-stat and make sure it is working the right way, and try seeing if i can move the fan on the back side and i will get back to you guys. thanks a ton for all the help guys. ill be back later with some info