Block Heater - Page 2 - Diesel Forum - TheDieselStop.com
7.3L IDI Diesels (Not Power Strokes) Technical discussion of topics related to vehicles powered by the 7.3 Liter In-Direct Injection Navistar engines.

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post #16 of 27 (permalink) Old 01-05-2019, 11:26 AM
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I would take Bugmans advice and get a timer/tune up the the glow plug system. If you are paying the electric bill a timer will pay for itself in month or so. I usually plug in when it gets too below freezing, and have the timer come on 2-3 hours before I want to leave. I may leave it on all night if it is down to -20 or lower, but usually even 2-3 hours works fine at that temp. They make extension cords that have a clear ends that light up when you have power going through the cord. They work great for making sure the outlet/timer is getting power to your truck. Some drape the cord over the drivers side mirror to help remember they are plugged in. If the truck is cold when I plug in my block heater I can hear it working if I put my head down by the driver side tire if I don't have a lighted cord. Make sure you batteries and glow plug system is in good working order in the fall. Remember you can't always plug in when you are away from home.
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post #17 of 27 (permalink) Old 01-05-2019, 08:16 PM
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When its my own dime I plug in when its +20*F sometimes, depends on if its windy since that wind will be pulling heat away.
Right, and quite a few "keyboard mechanics" have argued wind chill only applies to living flesh. Park your truck on a 10 day in the sun with no wind and the cab will be way warmer than the same temp on a windy day. Even with a dark color the cold wind sucks the heat right out of the sheet metal.
A good rule to live by:
Never argue with a man from Wyoming about wind !

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post #18 of 27 (permalink) Old 01-05-2019, 08:20 PM
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+1 on the cord ends that light up when powered.

Also be sure to get the proper gauge extension cord. That heater draws some amps.


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post #19 of 27 (permalink) Old 01-05-2019, 09:29 PM
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When its my own dime I plug in when its +20*F sometimes, depends on if its windy since that wind will be pulling heat away.
Right, and quite a few "keyboard mechanics" have argued wind chill only applies to living flesh. Park your truck on a 10° day in the sun with no wind and the cab will be way warmer than the same temp on a windy day. Even with a dark color the cold wind sucks the heat right out of the sheet metal.
A good rule to live by:
Never argue with a man from Wyoming about wind !

😉
Well said my friend.

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post #20 of 27 (permalink) Old 01-05-2019, 10:05 PM
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The effect of wind chill is to increase the rate of heat loss and reduce any warmer objects to the ambient temperature more quickly. It cannot, however, reduce the temperature of these objects below the ambient temperature, no matter how great the wind velocity.

Actually... wind moving across moisture evaporates that moisture which removes thermal units by the heat of vaporization (energy required for the phase shift from liquid to gas) - thats the principle behind evaporative coolers, how perspiration cools a body, etc.






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post #21 of 27 (permalink) Old 01-05-2019, 10:19 PM
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When you put moisture into the equation all bets are off.
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post #22 of 27 (permalink) Old 01-06-2019, 01:52 AM
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Several ways to compute Wind Chill Factor some do not use humidity in the formula. However, Bugman is correct, you will not reduce temperature below ambient. The Wind Chill Factor charts came about in Artic exploration as a way to prevent frostbite.
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post #23 of 27 (permalink) Old 01-06-2019, 09:59 AM
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A good rule to live by:
Never argue with a man from Wyoming about wind !
😉
Yep, years ago a driver said on his CB, hey, the wind quit! Then some quick-thinking individual answered back, if the wind ever quit in WY everybody would fall down!

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post #24 of 27 (permalink) Old 01-06-2019, 11:33 AM
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Right, and quite a few "keyboard mechanics" have argued wind chill only applies to living flesh. Park your truck on a 10 day in the sun with no wind and the cab will be way warmer than the same temp on a windy day. Even with a dark color the cold wind sucks the heat right out of the sheet metal.

speaking in engineering terms wind chill is a fake number, you can not get below ambient on a dry surface no matter how much wind you have, I would wager that to which they are referring, but wind will help take a warm engine down to ambient faster, and cause you to have to input more energy into it to get to a desired temp with wind in the equation.


But once homeostasis with the ambient temperature wind will cease to have any effect on it until we desire to raise the temp. (Wish I had a wind break for my car and truck as out here you really need it as stuff be cold!)

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post #25 of 27 (permalink) Old 01-06-2019, 01:00 PM
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That heater draws some amps.
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Actually... wind moving across moisture...
Right - "wind chill" only applies to liquid water, and only when relative humidity is below 100%. Relative humidity doesn't apply to air below 32F because there is no humidity in that air. But as that air strikes a warm object/body, the air warms. If it comes above 32 its relative humidity is 0% at that instant, causing extreme wind chill ONLY to wet/damp/humid surfaces. Yes, wind will cool dry surfaces faster than stagnant air does, but that's not what "wind chill" means. Only keyboard physicists/meteorologists confuse that term.


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post #26 of 27 (permalink) Old 01-06-2019, 01:18 PM
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Yep, years ago a driver said on his CB, hey, the wind quit! Then some quick-thinking individual answered back, if the wind ever quit in WY everybody would fall down!
Yep same here, I wish you guys would stop sending your wind on up north here. Getting tired of it .
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post #27 of 27 (permalink) Old 01-07-2019, 08:27 PM
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When I was moving to Kansas, I was told that there was nothing between Kansas, and the North Pole, but a barb wire fence, and it leans south. I've been to Wyoming, and when you can get passed by an empty Coke can @ 60 mph...well that's more wind than I ever saw anywhere in Kansas.
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