Lower Radiator Hose doesn't have a coil spring

[hayhauler71]

get a piece of welding rod and make your own spring

[spddm0n]

Originally Posted by hayhauler71

get a piece of welding rod and make your own spring

Good idea!!!
Posted via Mobile Device

[1972RedNeck]

Originally Posted by mike16

It is needed. the vaccuum generated by the Pump should be suckin fluid. not collapsing a lower hose. Just because a system works under pressure of any amount does not preclude it from generating a vacuum. all there really has to be is a difference in pressure. after all a clogged system working under 15 psi will create a vacuum but a clean system working under the same pressure does not? new fiziks?

Ah, you just had to bring math into the subject, eh? Well, we might as well get into the nitty gritty of it to show that you are wrong.

Even if the water pump pumped 50 GPM (which would be pushing it for even a high volume pump) and the bottom radiator hose was 1 1/2" diameter, it would take a .55 psi pressure differential to flow the 50 GPM through the system.

In other words, as long as our radiator cap holds .55 psi, no collapsing will happen.

If you have a cap that holds no pressure (bad rubber on the cap), and a clogged radiator, then yes, your bottom radiator hose can collapse.

But, I digress - you can believe what you want, and I will believe the facts and physics.


Good day.

[Steeveedee]

I will say that in general, a collapsing lower hose means a clogged radiator. Does any newer vehicle have a spring? I know that my 2000 Astrovan didn't. But the hoses looked to be made a bit better.

[In The Ten Ring]

It took me a few visits to Advance Auto to get hoses that worked for me....what their computer said would fit did not! Just keep after it, save your receipts, and you'll get there.

I have a bit of a leak though, one hose isn't quite the right fit bit it works well enough. It's on the heater core off the engine though, the big radiator hoses do fit well.

I saved their parts number for "next time."

[Rufas]

Originally Posted by 1972RedNeck

Sounds logical, until you put a 15 PSI radiator cap on the system. You will NEVER collapse the bottom radiator hose with 15psi (or even 3 psi) in the cooling system.

Take the spring, throw it in the scrap, install the new hose, and be on your way.

Wanta bet?

The upper hose on my 468 BBC will suck the upper radiator completely flat at high RPM. How do I know? When test driving the 468 right after the install I left my hood off. The hose would collapse flat as a pancake.

My fix (don't know if it's correct) was to replace the hose with a flexible stainless steel hose. No more collapsing.

[davepl]

Originally Posted by 1972RedNeck

Sounds logical, until you put a 15 PSI radiator cap on the system. You will NEVER collapse the bottom radiator hose with 15psi (or even 3 psi) in the cooling system.

Take the spring, throw it in the scrap, install the new hose, and be on your way.

Huh? Putting a 15psi cap on doesn't inflate the system. It's not magic.

Maybe you've got enough pressure when hot to prevent collapse... should I infer from that you think it's OK to collapse when cold?

[mike16]

its best not to think about it too much. I put one in to prevent the lower hose from collapsing. no clogged radiator or hi volume pump. Mine does not collapse and does not restrict flow. problem solved... nuff said.

[D.PASSMORE]

NAPA # 7463-Lower Rad/SBC hose and buy a coil off eBay.

[1972RedNeck]

Originally Posted by davepl

Huh? Putting a 15psi cap on doesn't inflate the system. It's not magic.

Maybe you've got enough pressure when hot to prevent collapse... should I infer from that you think it's OK to collapse when cold?

Yes, I am saying that as the engine warms up, pressure builds and the radiator hose can't collapse.

When the thermostat is closed (engine cold), there is negligible flow through the radiator - if there is no flow through the radiator, how can the water pump collapse the bottom radiator hose?

[1972RedNeck]

Originally Posted by Rufas

Wanta bet?

The upper hose on my 468 BBC will suck the upper radiator completely flat at high RPM. How do I know? When test driving the 468 right after the install I left my hood off. The hose would collapse flat as a pancake.

My fix (don't know if it's correct) was to replace the hose with a flexible stainless steel hose. No more collapsing.

Your top hose is collapsing? Sounds interesting.

Here's one for all of you - when the hose collapses, it displaces fluid, correct? If the system is full of liquid (which is non compressible for the pressure we are talking about) with a tight cap, where does the displaced fluid go? Magically disappear at high RPM and then reappear when you take your foot out of it??