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Old 05-02-2012, 12:04 AM   #1 (permalink)
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Default Opinions on thermostat????

What are the pros / cons of not running a thermostat?
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Old 05-02-2012, 12:53 AM   #2 (permalink)
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There is absolutely NO advantage to removing it. A thermostat should only be removed if you are in the middle of nowhere and it sticks shut with no replacement available.

If the thermostat must be removed to prevent overheating then there is another fault that must be corrected.

lack of a thermostat can allow the coolant to flow fast, fast enough that under some circumstances it may not have enough time in the radiator to dissipate engine heat. I have corrected overheating problems before simply by installing a thermostat where someone else removed and discarded it. Many other things can cause overheating, this is only one of them.

In cold weather it may not reach operating temp, or take forever getting warm enough to get a little heat, if at all.

Cons to running a thermostat: None

Ask me how Know!
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Old 05-02-2012, 03:17 AM   #3 (permalink)
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A few more "con"s - engine effiency will be down, fuel consumption will be up; if it's EFI it may stay in the open loop "warm up" cycle, in which case the fuel consumption will be unbelievable; you run the risk of this 'overfuelling' washing the oil off of the cylinder walls and causing dilution of the lubricating oil in the oil pan, leading to low oil pressure & increased wear; there will be little or no heat in winter and in rare cases (depending on the location of the thermostat) it is possible for some cylinders to run cool whilst others run hot, and as strange as this may sound, the engine may actually overheat and seize.

If you must remove the thermostat because of an emergency situation, remove the inner valve & heat motor and replace the outer ring, this will impede the flow of water some - to approximately the point where it would be with the thermostat fully open, and reduce some of the issues mentioned above.
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Old 05-02-2012, 07:56 PM   #4 (permalink)
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It is one of the John's performance 1.3s with a HD carb. What thermostat would you recommend?
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Old 05-04-2012, 12:36 PM   #5 (permalink)
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Motorad 2040 is a high flow thermostat and very high quality.


It comes in 192F(stock) 180F or 160F. I prefer to run 192 for best fuel economy. I would not run 160F as it is just too cold, imo.

PN is 2040-192, 2040-180, or 2040-160

Amazon.com: Motorad 2040-192 High Performance Thermostat: Automotive Amazon.com: Motorad 2040-192 High Performance Thermostat: Automotive

Amazon.com: Motorad 2040-180 High Performance Thermostat: Automotive Amazon.com: Motorad 2040-180 High Performance Thermostat: Automotive

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Old 05-04-2012, 01:26 PM   #6 (permalink)
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I like 180 for most carb'd engines, have run 160 for non-daily drivers where I was concerned about charge temp being as low as possible.

*generally* a warmer engine is more economical and a cooler engine runs with a little more power r/t lower charge temp. Ever notice how when you pull out of your property on a cool morning and your gauge hasn't quite reached the normal range, and its sucking nice brisk morning air and it just seems a little stompier than normal.... yea

Still I agree with the above, a 180 is a good choice for a non-EFI daily driver.
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Old 05-05-2012, 03:11 PM   #7 (permalink)
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I asume by your handle, you'r in Texas. I'd run a 180......Boxcar....
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