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  #1  
Old 08-09-2003, 03:40 AM
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Lightbulb Thermostat = hotter engine???

check this:

Platinum Jaw Rice Eater says:
Thus , Allowing the water to be heated , Up to rough 200 , Mostly designed for heat in winter , etc.
Platinum Jaw Rice Eater says:
Because
Platinum Jaw Rice Eater says:
When you pull the thermostat out.
Platinum Jaw Rice Eater says:
You rengine will run cooler , your radiator will stay cooler , your tranny fluid will be cooler as well.

how true is this? pulling out my thermo will make it run cooler?
O_o'''

were goin to the track tomorrow. his 'lude is broke so hes bringin da truck. an im bringin da ruckus.
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  #2  
Old 08-09-2003, 06:27 AM
lee lee is offline
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I think this might be engine dependent. I have personally seen engines (admittedly big block US iron) that would overheat without the presence of a thermostat.

secondarily, the engine management system is expecting the car to warm up and then enter management loops. If it doesn't get there heat wise, I have no idea what that does to power production.

Only sure way is to test your individual condition/vehicle (duh!).
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Old 08-10-2003, 05:34 AM
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With the T-stat out and the car at idle it will never warm-up. Driving the car hard for a long period of time will push the temeratures to the maximum. Hopefully it will not overheat. When the max temp is not reached when driving hard, with T-stat out, the radiator is large enough to handle the heat load.

Taking out the T-stat may effect engine venting. Drive the front of the car up on a ramp or blocks this get the air to the radiator. Run the engine and top of the rad-r. Let it warm-up and cool off a few times if possible.

I would like to know your results if try this.


Install a T-stat by-pass valve. That would be nice but a lot of work.
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Old 10-08-2003, 09:37 PM
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Quote:
I think this might be engine dependent. I have personally seen engines (admittedly big block US iron) that would overheat without the presence of a thermostat.
I'm not sure why the lack of a thermostat would cause an engine to overheat. I always thought that its purpose was to block coolant flow to allow the engine to get to operating temperature quicker and to force more/hotter coolant through the heater core to warm up the interior sooner.
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Old 10-08-2003, 09:50 PM
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logic says it wouldnt overheat unless systems diags say somethings wrong and shut stuff down... :\
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  #6  
Old 10-09-2003, 12:01 AM
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While I think this guy is more or less up the creek the thermostat can reduce the area of the flow path but the design engineer should have taken this into account.

It is interesting as a reverse of this, that near fifty years ago I competed in all forms of motor racing using a large English AC sports car which I fitted with a much modified, flat head, side valve V8, courtesy of the great Henry. When these engines were held at sustained high RPM, the twin water pumps increased pressure to the extent that the water travelled through the radiator too fast to be cooled.

Removing the thermostat actually increased the problem. The usual fix was to fit a restricting baffle but this could cause aeration and my cure was to drill holes in the water pump impellers in order to reduce their efficiency.

Sorry to stray so far off topic.
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Last edited by Trevor; 10-09-2003 at 12:14 AM.
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Old 10-09-2003, 05:22 PM
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Quote:
Originally posted by Earthworm
I'm not sure why the lack of a thermostat would cause an engine to overheat. I always thought that its purpose was to block coolant flow to allow the engine to get to operating temperature quicker and to force more/hotter coolant through the heater core to warm up the interior sooner.
Dave, it is very interesting having you back over old posts and bring them up again.

I agree with you and that is WHY I posted about venting the engine out. It can only be trapped air expanding that would blow out coolant.

Nice to have you back Dave.
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Old 10-09-2003, 05:33 PM
oab_au oab_au is offline
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It is a heat engine.

The output of the engine depends on the heat the engine can handle. The hotter the engine runs the higher the output. After all we are putting cold air in, heating this air as much as we can, to provide the pressure to push the piston down. We don't want to loose heat to a cold engine block.

The maximum temperature that the engine can run at is dependent on the max temp that the oil etc. can handle.

Harvey.
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  #9  
Old 10-10-2003, 10:07 AM
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Let's take this down a more technical path

Harvey,

Can you shed some light on radiator and intercooler sizing for internal combustion engines? I work with industrial heat transfer equipment and have basic sizing calculations, but I'm unsure how automotive heat exchangers are sized. My thinking is HP is converted to BTU/Hr then the area of the heat exchanger is calculated using industry rules-of-thumb to give a final size. Am I going the right way here?

Thanks,
Todd

BTW - welcome back! Glad you got that mainspring fixed!
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