November 06, 2018, 10:00 AM
329LCorrect circulation on block mounted water pump
Is it best to put the water in at pump level or at top of an engine? Application is a dragster with a rear mounted radiator.
November 06, 2018, 11:32 AM
TD3550Always better on top. You running an extended neck?. Certain manifold i put in a pet****. Like out of a radiator. Screw it into the crossover on a 598. Fill and basically bleed all the air right out..Same with a 632 that was in an altered with a lay down radiator in the front. No air.Case in point. Like on the earlier Detroit engines. they placed the same bleed valves in the upper radiator hose pipe.Crack the valve while filling the radiator. Reason being prevents a hot block condition while trying to burp it.
November 06, 2018, 12:08 PM
1legBest place to fill any coolant system is on the low pressure side of the pump. This is why you see most factory radiators have the filler neck on the tank opposite the upper radiator hose.
It is best to use an expansion tank(plumbed properly) or use the Meziere 200 series pump.
November 07, 2018, 10:58 AM
329Lquote:
Originally posted by TD3550:
Always better on top. You running an extended neck?. Certain manifold i put in a pet****. Like out of a radiator. Screw it into the crossover on a 598. Fill and basically bleed all the air right out..Same with a 632 that was in an altered with a lay down radiator in the front. No air.Case in point. Like on the earlier Detroit engines. they placed the same bleed valves in the upper radiator hose pipe.Crack the valve while filling the radiator. Reason being prevents a hot block condition while trying to burp it.
When I built my new car last year, i took the bypasses from the back of the intake to the front of the intake off. Since doing that, i have noticed that the engine has hot spots and temperature climbs with water pump on, turn the water pump off and it wont gain anything. I am going to put my bypasses back on this winter, but wasnt sure if i should reverse my water pump or leave it the way it has always been.
November 07, 2018, 01:45 PM
1legThe reason you don't see any tempature gain with the pump off is you are not moving any water past it to see a change. The only way to get a accurate temp reading is with the water pump on.
Reversing the pump will only reduce the amount of water it flows!
November 07, 2018, 01:48 PM
329LThank you for the info 1leg. I will just put my by passes back on this winter.
November 07, 2018, 02:17 PM
Tony BarrettI found with my car to put a pet**** in the high point of the radiator. To fill it I open the pet**** until water comes out then close it and continue to fill. I do use bypass hoses. I also jack the front of the car up so that the fill is the highest point.
November 07, 2018, 02:36 PM
329LI am not having an air pocket issue. I am noticing hot spots, verified with a infrar gun. I feel that the water in the back of the engine is getting stagnant because its not really getting a chance to circulate properly because no where for it to go. That is why i want to put the bypass hoses back on from back of intake, to the front of intake.
November 07, 2018, 08:04 PM
Bad NewsSure you are.
Air, air makes steam, steam does not move nor does it cool. The only reason lines go to the back is to remove air pockets. In reality the biggest line you need is a #6.
Fill from the highest point and it will take about a 1/2 hr with the pump running and adding water to replace the air for the air to be purged.
High points, like ls have steam lines, old pro heads had steam lines, ever head has potential air pockets.
November 07, 2018, 09:11 PM
Don RI added house radiator key vents to the high points on my rear radiator dragster. It works best to fill it with the pump off and bleed the air out.
November 09, 2018, 07:00 AM
329Lquote:
Originally posted by Bad News:
Sure you are.
Air, air makes steam, steam does not move nor does it cool. The only reason lines go to the back is to remove air pockets. In reality the biggest line you need is a #6.
Fill from the highest point and it will take about a 1/2 hr with the pump running and adding water to replace the air for the air to be purged.
High points, like ls have steam lines, old pro heads had steam lines, ever head has potential air pockets.
I know i am getting the air out of the system when filling, water runs quietly, but that doesnt mean its not building steam. Good point Bad News.
November 09, 2018, 09:14 AM
WILDBILLA trick I used to fill for guys that are having trouble getting air out use an old radiator cap and put a small tie wrap around the internal vacuum valve to hold it open then with it on use a hand vacuum pump on the vent hose to pull air out.