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Old 03-12-2014, 03:24 PM   #1
acemang
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Question ..........after 10 minutes of engine running

I came home and opened hood. and had a weird noise that I have not heard before. I cannot explain the noise but I have a 10 second or so video of it that the sound comes out clearly. Am I allowed to post a video here, or how should I do to it get to board members to get opinions?


A little pre video info. Temp outside is 50 degrees. Engine temp was 175 at time of trip end. Motor is a cadillac 472.
EDIT: Here is youtube link: http://youtu.be/8cWmO_0_90Q

It doesn't sound to me like standard engine ticking noises that you hear after shutting down an engine.

Last edited by acemang; 03-12-2014 at 03:29 PM.
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Old 03-12-2014, 03:28 PM   #2
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Re: Question ..........after 10 minutes of engine running

Post it up.
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Old 03-12-2014, 03:30 PM   #3
acemang
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Re: Question ..........after 10 minutes of engine running

Added youtube link
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Old 03-12-2014, 03:31 PM   #4
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Re: Question ..........after 10 minutes of engine running

Those 472's are good quite engines. What do you mean by 10 minutes? On rebuild? Or transplant of a runner ?
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Old 03-12-2014, 03:43 PM   #5
acemang
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Re: Question ..........after 10 minutes of engine running

Sorry just took it to sons school to drop stuff off. No new work done to it recently. Just noticed a noise that was new.
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Old 03-12-2014, 03:45 PM   #6
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Re: Question ..........after 10 minutes of engine running

metal contracting?
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Old 03-12-2014, 03:48 PM   #7
acemang
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Re: Question ..........after 10 minutes of engine running

its almost like water bubbling but not coming from radiator or hoses
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Old 03-12-2014, 04:02 PM   #8
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Re: Question ..........after 10 minutes of engine running

If way to low on water and the engine over heats and makes steam it will make a sound like that. Although you should see the hoses move and hear it even when engine is off --unless the thermostat is stuck closed. The other liquid is gas in the carb getting to hot. The last liquid is oil. If thats it your screwed.
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Old 03-12-2014, 04:07 PM   #9
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Re: Question ..........after 10 minutes of engine running

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Originally Posted by Ilike 72"s View Post
If way to low on water and the engine over heats and makes steam it will make a sound like that. Although you should see the hoses move and hear it even when engine is off --unless the thermostat is stuck closed. The other liquid is gas in the carb getting to hot. The last liquid is oil. If thats it your screwed.
I think you nailed it with the thermostat. Its a 185 and I think it had not opened yet as the temp was 175, I am just a nervous nelly. I have plenty of radiator fluid water mix 50/50. Oil is not burnt and is clean. Im guessing that you are right on the money.
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Old 03-12-2014, 04:07 PM   #10
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Re: Question ..........after 10 minutes of engine running

Sounds like thermal expansion/contraction of radiator.
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Old 03-12-2014, 07:26 PM   #11
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Re: Question ..........after 10 minutes of engine running

OR---the significant amount of energy within the engine associated with the intermolecular forces of the liquid state changing to steam at the expansion rate of 30600/18 At 100C .
Rrrrrrightttt.,,
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Old 03-12-2014, 08:33 PM   #12
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Re: Question ..........after 10 minutes of engine running

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Originally Posted by derotoreut View Post
Sounds like thermal expansion/contraction of radiator.
I agree thermal expansion/contraction, Question is where, radiator, or possibly in the exhaust system.
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Old 03-12-2014, 08:40 PM   #13
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Re: Question ..........after 10 minutes of engine running

Almost sounds like the spring in the choke assembly moaning as it heats up.
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Old 03-12-2014, 10:00 PM   #14
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Re: Question ..........after 10 minutes of engine running

Sounds like bubbles in a steel tube, almost like a wind chime. Are any of the heater lines metal, with a little hose at each end? Could be air burbulating in the system.
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Old 03-13-2014, 09:44 PM   #15
acemang
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Re: Question ..........after 10 minutes of engine running

After some great tips on here, I headed back to my man cave aka garage and investigated. After an hour I figured out the issue. I needed to treat my engine like a baby and burp the radiator. Once I did that the noise has gone away. it could have gotten bad so Im glad I heard the noise in the first place. Thanks for all the tips and advice.
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Old 03-13-2014, 10:45 PM   #16
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Re: Question ..........after 10 minutes of engine running

Quote:
Originally Posted by Ilike 72"s View Post
OR---the significant amount of energy within the engine associated with the intermolecular forces of the liquid state changing to steam at the expansion rate of 30600/18 At 100C .
Rrrrrrightttt.,,
No not quite but it does takes 970 btus of energy to change the liquid state to steam state, your going in the rite direction with your thinking
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Old 03-14-2014, 06:50 AM   #17
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Re: Question ..........after 10 minutes of engine running

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No not quite but it does takes 970 btus of energy to change the liquid state to steam state, your going in the rite direction with your thinking
are you baseing your BTU number off of atmosheric pressure at 14.7

remember the higher the pressure the more BTU required to boil
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Old 03-14-2014, 08:24 AM   #18
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Re: Question ..........after 10 minutes of engine running

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are you baseing your BTU number off of atmosheric pressure at 14.7

remember the higher the pressure the more BTU required to boil
The latent heat of vaporization is the same at any pressure. Raising the pressure simply raises the temperature at which vaporization occurs.
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