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Old 11-08-2005, 12:51 PM
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Overefficient cooling system and popping noise.

I have recently installed a custom made aluminium radiator having had overheating problems before. I have since then experimenting strange popping noise that I cannot figure where they come from...It will come on only when the engine had reached its full temperature and the thermostat will have opened and closed few times. It sounds like a sharp popping noise..almost like a loaded spring getting suddenly fully detented. The same noise sometimes will still go on even after having shutt of the engine. It is strong enough to be heard into the car overcoming the throaty 383 exhaust noise.You know that noise contracting metal,under sudden cooling will do?its very similar but with that peculiar "spring detent" noise to it.

Stopping at a garage the other day to have the folks listening to it someone suggested a deffective thermostat dropping suddenly its compressed copper sensor..made sense to me since that spring popping to it! I've changed thermostat with the same noise keeping going.

I tend to link that unidentified noise with the cooling system and here is why: With a 180 degrees thermostat installed the temperature will constantly and regularly vary between 180 and 160. It climbs slowy to 180 and once reached it it will start dropping towards cooler temp. till it reaches 160..then start to climb. And it looks like it will make the noise more often when into the cooler areas..as if then some metal contracting takes place.The sound seems to be less frequent when the guage is into the warmer areas..I have ceramic coated headers there but they are the same as before with the brass rad. and never had that noise before..sounds something else than plain metal cooling/contracting.

Now that said can it be I have an overcapacity radiator problem causing the varying temp.and possibly that popping noise?I have tried a 195 but didn't like the temp getting close to 210 gegrees the way it did few times..look like i am stuck with the 180.

Maybe I still have entrapped air having changed thermostats few time recently..could this cause that noise?

To me the best would be to see a constant 180 reading on my guage but how could I see this happening? And I definitly don't like that popping noise..too strong and frequent to stay harmless long time.

thanks,Ronald.

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Old 11-08-2005, 03:46 PM
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Doc here,

Sounds like two things...

First Air trapped in the system, causing the Temp Excursions,

And a stuck or improper Radiator Cap, not opening at the proper pressure (or open/close fast, just short of pressure) not allowing trapped air out.

Be sure your recovery tank too is full, or it will draw back air again after expelling it , instead of coolant to replace the air.

Doc
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Old 11-08-2005, 04:30 PM
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I'm lost on this one, but i hope if you solve it, you dont disappear like everyone else does on these posts, and then never tell us what it was, I would like to know what it is too.
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Old 11-08-2005, 06:57 PM
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Originally Posted by brainsboy
I'm lost on this one, but i hope if you solve it, you dont disappear like everyone else does on these posts, and then never tell us what it was, I would like to know what it is too.

I tend to come back and say what happened next as I know from facts the archives here can be very helpfull to poor shade three mechanics like me who are eventually facing weird problems...

Doc vette, I have put the cap under pressure testing and it passed high and clear keeping its pressure for the time its supposed to be...OK let think there is entrapped air keeping my guage yoyoying but that noise!!I can't link it !Are you thinking about the actual thermostat spring that could caused ?

thanks to all,
Ronald.
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Old 11-08-2005, 07:05 PM
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Doc here,

What I'm thinking may be happening, is the Cap is opening briefly, then slamming shut, causing the water to "Explosive" (if you will) Back flow into the engine/Radiator..producing a sound like "THUMP" tick ..tick ...tick ...tick...

Excursions on a temp gauge are almost always trapped air.. A Sender can't read air..(Idle) and then as you move along the water flows..giving a more accurate reading..

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Old 11-08-2005, 08:31 PM
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I would not have a problem with the temp moving the 160 to 180. I run a 160 thermostat and it keeps me plenty cool with my big 4 core brass job (would like to find an aluminum though). I would say that there is no such thing as an overly effective cooling system.

As far as the ticking, something metal to metal... like the thermostat and radiator cap. I don't think that temperature change is drastic enough to cause the pinging normally associated with expansion/contraction.
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Old 11-09-2005, 06:42 AM
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My though is the t-stat making the noise. I have heard t-stats hammer on cars that are running hot.

Vince
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Old 11-09-2005, 07:39 AM
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Originally Posted by 302/Z28
My though is the t-stat making the noise. I have heard t-stats hammer on cars that are running hot.

Vince
When the guys at the garage suggested a defective thermostat I came home took the thermostat out put it in boiling water with a thermometer beside to monitor it and it was opening according to the water temp as it should...in precaution I still changed it for another one,a 195, that I also checked into the boiling pot and also then the results showed OK..put it on with the same popping happening...took it off after two runs because it would reach close to 210 sometimes. Put back a 180 and still have the same popping noise...You should have seen the interrogative face the mechanic had when listening to that one..having his eyes and hands running all over the motor and puzzled was he ever!!

Snow is here this morning wich calls for the hibernation period of the TVR..could very well be that I won't be able to check that one till spring..

thanks,Ronald.
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Old 11-09-2005, 08:17 PM
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have you thought about running a restriction instead of a thermostat? not a huge hole but enough to make coolant flow. This may take some work but if it stopped your popping noise you would know where it comes from. It would eminate that from the system if it did not work.
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