I experienced the same thing. I was told the new hoses don't need them. However, I took the spring out of my old one and put it in the new hose [img]smile.gif[/img]
69 RS Conv therapy program, Autogear M22, 8-pt cage, with a new 410! SOLD
New therapy program - 68 Coupe. Will be survivor exterior, modern underpinnings! SOLD
67 Belair with perfect floors, pinchwelds and firewall. Hmmm!
Newly-manufactured hoses don't need the spring due to better materials and processes; the old hoses softened with heat and aging and needed the spring to maintain their shape under suction at high rpm. [img]graemlins/thumbsup.gif[/img]
I agree with JohnZ. The newer hoses are reinforced with belts and are pretty rigid. Springs are a thing of the past.
On the dyno we test the best high volume/flow pumps such as Stewart's Stage II and III (probably the best highflow competition pump) pumps with off the shelf hoses with no problems. The hoses won't come close to collapsing.
Ok, riddle me this.. Since the system is under pressure, depending on what rating your cap is, how is it possible that the hose would collapse?
Perhaps the spring was only needed when the system was cold and not pressurized? Once a system is up to operating temperatures, you can barely collapse a hose by squeezing it in your hands so I just don't see a hose collapsing from suction when there is that much pressure present in the closed loop system...
Does this make sense or am I missing something obvious? I know that springs have been used for this purpose since I was a baby so there must be some logic to it. I guess I am just missing it.
Bought a reproduction hose recently-no spring. I did not install one either. Is this going to be a problem?
As for newly manufactured G.M. hoses not having the internal spring, my 97 Silverado came from factory with the internal spring on lower radiator hose and when I replaced it later on with a G.M. hose it was the same design with the spring. Now if only I can locate the truck seems some #*^@>"er stole it.
Ok, here is my deal.....
Everything on/in my cooling system is new or has been replaced. Just a week ago I changed out the waterneck and put in a new BeCool 180* thermostat. I also bought a "no name" aftermarket 16# cap with the billet aluminum cover. The bottom hose has the spring through the entire length of the hose. The top hose only has the spring half as long as the hose and is next to the radiator.
Now, get this, after starting, running, going to normal temperature (185*) my hoses are nice and firm. Ok, now after the motor cools completely the top radiator hose will collapse just behind the spring. When I open the cap the suction releases and the hose goes back to normal shape.
What the heck is causing this????