Coolant out to heater core
01-09-2019, 05:25 PM
#1
Melting Slicks
Thread Starter
Coolant out to heater core
All,
If I remember correctly, my heater hose came off of the top of my intake when I took everything apart.
I noticed that my new aluminum water pump has a 1/2" npt fitting that I can attach a hose barb to - does it matter if I attach the heater core hose to the intake or to the water pump?
(I'm thinking that there would be more flow / pressure if I attach it directly to the water pump output....)
Thoughts?
Adam
If I remember correctly, my heater hose came off of the top of my intake when I took everything apart.
I noticed that my new aluminum water pump has a 1/2" npt fitting that I can attach a hose barb to - does it matter if I attach the heater core hose to the intake or to the water pump?
(I'm thinking that there would be more flow / pressure if I attach it directly to the water pump output....)
Thoughts?
Adam
01-09-2019, 05:29 PM
#2
The intake is the supply.
The water pump is the return.
The water pump is the return.
01-09-2019, 10:28 PM
#3
Advanced
Adam,
As stated there is a feed and return hose on the heater core so you need to hook up to both the water pump and intake. The hoses are also different sizes. 5/8” hose on the intake and 3/4” on the water pump. Here are the fittings I used:
https://www.summitracing.com/parts/prs-1009
As stated there is a feed and return hose on the heater core so you need to hook up to both the water pump and intake. The hoses are also different sizes. 5/8” hose on the intake and 3/4” on the water pump. Here are the fittings I used:
https://www.summitracing.com/parts/prs-1009
01-10-2019, 06:51 PM
#4
Team Owner
I know this has been discussed before but is there any valid reason why those fittings cannot just be capped off? I don't want to accidentally turn the heater on and flood the floorboard with coolant from a 40 year old heater core.
01-10-2019, 06:54 PM
#5
Race Director
yes they can be capped off. You could also just put a loop hose on from one to the other. You could also put shut-off valves in both hoses so you can turn them on if you want heat and then turn them back off when you don't.
Last edited by derekderek; 01-11-2019 at 10:02 AM.
01-10-2019, 06:54 PM
#6
There are many stationary engines with pipe plugs in them. Boats, generators,pumps,etc.
01-11-2019, 10:12 AM
#7
Team Owner
01-13-2019, 10:53 AM
#8
Melting Slicks
Thread Starter
Thanks all. I knew it was a loop; I just assumed that the output would be coming from the pump for better pressure.
My intake doesn't have a great place for the output currently.... (I have the stock temp gauge in one intake 1/2" NPT port, and my new digital one for my Holley HP EFI, and the 3rd port in my intake is partially blocked by the high flow Mr Gasket thermostat that I have (It's way thicker than normal)...
Adam
My intake doesn't have a great place for the output currently.... (I have the stock temp gauge in one intake 1/2" NPT port, and my new digital one for my Holley HP EFI, and the 3rd port in my intake is partially blocked by the high flow Mr Gasket thermostat that I have (It's way thicker than normal)...
Adam
01-13-2019, 11:07 AM
#9
Advanced
Adam,
Not sure if your Jegs heads came with the 3/8NPT port between cyclinders 1&3 like my profilers did, but I made a pilot drill out of an old drill bit and drilled it out and tapped it for 1/2NPT to use the stock location/sending unit on my 79. I got a couple quotes from shops for $40-50 so that might also be an option for you too if the heads are still off the engine. Good luck.
Not sure if your Jegs heads came with the 3/8NPT port between cyclinders 1&3 like my profilers did, but I made a pilot drill out of an old drill bit and drilled it out and tapped it for 1/2NPT to use the stock location/sending unit on my 79. I got a couple quotes from shops for $40-50 so that might also be an option for you too if the heads are still off the engine. Good luck.