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Author Topic:   TOP RAD. HOSE
captain
Member
posted September 07, 2003 05:06 PM
0verheated engine two weeks ago, just got finished with complete O/H. Had heads checked and machined. Engine runs great! but when the thermostat opens and starts to build pressure the top hose colapses. Tried another thermostat same result. I have never seen this on the top hose. Any suggestions?


racer17j
Member
posted September 07, 2003 06:07 PM
first off get rid of the thermostat also are you running a stock aluminum water pump think they came off a vette or something anyway we had a couple guys try to run them but they pump the other way thats the only thing i can think of right off hand

[This message has been edited by racer17j (edited September 07, 2003).]

captain
Member
posted September 07, 2003 08:09 PM
Have always run a thermostat and never had any troubles, It is easy to remove to try it. The water pump is nothing speacial, same one as before the O/H


racer17j
Member
posted September 07, 2003 09:13 PM
don't take it out completely just take and gut the opening stuff out of it so it's just a restrictor. if it's not the water pump then maybe a vapor lock ? not sure this is a new one for me lol


FastEddy
Member
posted September 08, 2003 12:25 AM
I've seen this before. The thermostat is actually sticking and the pump continues to draw fluid causing the uppper hose to collapse. I observed this on a chevy van with an sbc 350. It was also a little low on water but not much. Maybe a quart.


captain
Member
posted September 08, 2003 06:52 AM
gonna try a new top hose (it feels soft) and a restricter in place of the thermostat this evening.


ctfarm
Member
posted September 08, 2003 07:19 AM
You're not building any pressure in the cooling system,get a good 20 psi radiator cap made for racing along with the other suggestions.A stock style cap is designed to draw in coolant from the reservoir to keep the system full and purge air out.



gerald berry jr
Member
posted September 08, 2003 02:28 PM
ctfarm is right also run a hose with aspring in it


bryanb30
Member
posted September 15, 2003 09:00 PM
good call bryan one other way to do that is like i do take a thermostate housing that has the temp sencors in it and take them out and put a dump vavle in it instead that way you open it up and can run water thru till it dumps out the valve then close her up and put the cap on. that works good to if you are real hot after the race you can dump the hot water then fill her up with cool right away because you blow all the pressure off by opening the valve


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