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Slightly OT....Youll see.....

John M

John M

Well-known Member
Location
Nunyafn business
Buddy has a 31 A Model Ford, hot rod project. Put a 383 Stroker in it, using repro rad for the trcuk, aluminum. Cant get the air out of the system, keeps sucking the rad hoses flat. the one time it was right, no air, it ran hot, but when its sucking the hoses flat, it maitians 180 degrees al day long. Any ideas? BTW, he does have tractors.
 
without seeing his setup its hard to tell but check this, do the radiator hoses have the coil spring suport inside them or they just made out of hose stock? it sounds like thats the case, and also the 383 probably has a high capacity water pump on it , you need to either find some hoses containing the springs so they wont colapse or use steel tubing for the hose and connect the ends with short pieces of straight heavy duty hose, to see this setup, just tilt the hood of any handy semi tractor, a muffler shop can make the tubing the size and way it needs to be for his car, as for the air problem, sometimes it is nessessary to install a air bleed, a valve in the highest point in the system, or some newer cars have one in the top of the thermostat houseing, a petcock can be used, just drill and tap threads where it needs to be to bleed the air when the engine warms up and the thermostat opens , if all else is right it will only need to be done each time the cooling system is drained and refilled
 
He needs to get stel braided hose, like eric said, the stroker will have a high volume pump and will suck the hoses in without support.
 
There is such a thing as a water pump that turns the other way.I think if it has a serpentine belt on a v belt pump it turns the other way.It is not supposed to suck the hose flat,but they are supposed to have a spring inside the hose to keep that from happening.A lot of times filling a small block Ford with antifreeze I had to take a heater hose off while its running to let the air out and still might not get it all the first time.
 
John M is it just the bottom hose that goes flat? that means it needs that spring in the bottom hose. If it's the top hose, Trucker40 is right-you've got a reverse flow waterpump. Water flow should be up thru the engine and down through the rad. Crossflow rad? I can't help on.
 
I'd check the rotation of the water pump. My '89 Chevy K1500 with the 5.7 engine and serpentine belt rotates the water pump opposite from the earlier v-belt driven pumps on SBC's. I found this out when I tried to put quieter fan blades on it.

Depending on the origin of the pump, one of these could have found its way to your application. A 383 stroker might have been built out of a later truck engine and the same pump used.
 
If I understood corectly you said when the hoses are "Sucked flat" and there is no coolant flow it runs at normal temperature or "Runs 180ºF all day long"?
 
The SBC water pumps of either rotation are centrifugal pumps. Get the wring one for a given rotation, and it will still pump water in the same direction, only less efficiently.
 
1.) Get a lower hose with a spring in it, either inserted inside to water passage area, or buiit into the material of the hose itself.

2.) Is he running a thermostat, which would limit excessive water flow?
 
If you have a cross flow rad. on it you will need the rad. shroud that directs the air around engine.
 
I think hes got the wrong pump. I got a good look at it today, but without taking off the pump I wouldnt know for sure. HEs going to check with the guy he got it from and make sure its right for his engine, no marks of anykind I could see on it BTW.
 
Bob has the idea with the thermostat questioon. Without one the water will flow too fast to transfer heat efficiently and it will overheat. Sounds like it needs a restriction, such as a thermostat, to slow downthe flow.
 
bought a rebuilt water pump one time put it on and tractor ran hot check everything over and over finaly took the pump back off someone put the impeller on turn over the wrong way mined you this if after flushing ratator having it flushed at the radator shop changing hoses thermastat pulling my hair out for days lol
 
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