Leaving hood open
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Senior User
Joined: Jan 2013
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From: Gold Country
Leaving hood open
After a long drive I usually leave my hood open to cool down the engine bay. This is a practice I picked up while owning rotary powered vehicles to keep all the plastics and rubbers from deteriorating to quickly due to heat. Now being I own a Scorpion 6.7 with the Turbo and exhaust manifolds on top I want to make sure everything up there stays cool. My F250 SD (not sure if all) does not come with a hood insulator so this may also extend the life of the paint on the panel. I usually close it after an hour or two of cooling when still just warm to the touch.
Later in the future if I find a nice used 11-13 super duty hood, I plan on building one with manually adjustable vents to let that engine bay air escape, open when hot and closed when raining or cold. I live in California and some days in the valley I drive through 105F weather.
I know this may not sit to well with you cold weather guys who like to keep their engines warm 
Cooling down with the hood open.
Later in the future if I find a nice used 11-13 super duty hood, I plan on building one with manually adjustable vents to let that engine bay air escape, open when hot and closed when raining or cold. I live in California and some days in the valley I drive through 105F weather.
I know this may not sit to well with you cold weather guys who like to keep their engines warm Cooling down with the hood open.
Elder User
Joined: Mar 2005
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From: chicago burbs
when its chilly out ill do something similar. but more to warm the garage for working. only "active" cool down I've heard of is turbo timers. and then only seen them, in person, on kids cars. they tend to run harder and care a little less about equipment. (i know i did). but that is just to let the turbo cool down and keep bearings oiled.
i'm not familiar with rotary engines, do they like to over heat? i know they love to rev, but that is it. and i would assume oem would install radiators and cooling ducts to minimize issues.
any way seems like a waste of time and energy to pop the hood for cooling purposes daily. i'd be more worried about sun damage, to the belts, hoses, electric components, and plastic connectors, than the radiant heat they were designed for.
i'm not familiar with rotary engines, do they like to over heat? i know they love to rev, but that is it. and i would assume oem would install radiators and cooling ducts to minimize issues.
any way seems like a waste of time and energy to pop the hood for cooling purposes daily. i'd be more worried about sun damage, to the belts, hoses, electric components, and plastic connectors, than the radiant heat they were designed for.
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Senior User
Joined: Jan 2013
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From: Gold Country
when its chilly out ill do something similar. but more to warm the garage for working. only "active" cool down I've heard of is turbo timers. and then only seen them, in person, on kids cars. they tend to run harder and care a little less about equipment. (i know i did). but that is just to let the turbo cool down and keep bearings oiled.
i'm not familiar with rotary engines, do they like to over heat? i know they love to rev, but that is it. and i would assume oem would install radiators and cooling ducts to minimize issues.
any way seems like a waste of time and energy to pop the hood for cooling purposes daily. i'd be more worried about sun damage, to the belts, hoses, electric components, and plastic connectors, than the radiant heat they were designed for.
i'm not familiar with rotary engines, do they like to over heat? i know they love to rev, but that is it. and i would assume oem would install radiators and cooling ducts to minimize issues.
any way seems like a waste of time and energy to pop the hood for cooling purposes daily. i'd be more worried about sun damage, to the belts, hoses, electric components, and plastic connectors, than the radiant heat they were designed for.
Lead Driver
Joined: Jan 2006
Posts: 6,267
Likes: 5
It doesn't get so hot here, yet I like you're idea.
Heat soaking is hard on everything, being able to somehow manually cool things off before shutting down could be a great benefit.
I think I'd go about it in a different way though...
What if there could be a way to manually /temporarily adjust the thermostats into a much cooler setting?
Like with the flip of a switch, the thermostats change to 100* thermostats, and the truck sheds all the heat, a few blocks from home?
That way, once it's turned off, everything should be nice and cool and heat soak would be minimal.
Heat soaking is hard on everything, being able to somehow manually cool things off before shutting down could be a great benefit.
I think I'd go about it in a different way though...
What if there could be a way to manually /temporarily adjust the thermostats into a much cooler setting?
Like with the flip of a switch, the thermostats change to 100* thermostats, and the truck sheds all the heat, a few blocks from home?
That way, once it's turned off, everything should be nice and cool and heat soak would be minimal.
Thread Starter
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Senior User
Joined: Jan 2013
Posts: 348
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From: Gold Country
It doesn't get so hot here, yet I like you're idea.
Heat soaking is hard on everything, being able to somehow manually cool things off before shutting down could be a great benefit.
I think I'd go about it in a different way though...
What if there could be a way to manually /temporarily adjust the thermostats into a much cooler setting?
Like with the flip of a switch, the thermostats change to 100* thermostats, and the truck sheds all the heat, a few blocks from home?
That way, once it's turned off, everything should be nice and cool and heat soak would be minimal.
Heat soaking is hard on everything, being able to somehow manually cool things off before shutting down could be a great benefit.
I think I'd go about it in a different way though...
What if there could be a way to manually /temporarily adjust the thermostats into a much cooler setting?
Like with the flip of a switch, the thermostats change to 100* thermostats, and the truck sheds all the heat, a few blocks from home?
That way, once it's turned off, everything should be nice and cool and heat soak would be minimal.
Lead Driver
Joined: Jan 2006
Posts: 6,267
Likes: 5
Instead of adjusting thermostats then, and modifying truck, maybe a attachment that screws on the oil pan, and on command, a pump pumps the hot oil out of the engine, through a cooler added in the grill, and back to the engine.
Sucking the oil temp would also cool the engine down, but might take a bit longer depending on the size of the cooler that gets installed.
The cool part about this idea is that it could also be beneficial for running hard in the heat.
Sucking the oil temp would also cool the engine down, but might take a bit longer depending on the size of the cooler that gets installed.
The cool part about this idea is that it could also be beneficial for running hard in the heat.
Lead Driver
Joined: Jan 2006
Posts: 6,267
Likes: 5
maybe even use a small car rad with electric fan, and mount under truck somehow?
Could be a cool mod, and wouldn't require any permanent mods to truck.
Could be a cool mod, and wouldn't require any permanent mods to truck.
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Lead Driver
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928 Motorsports - Porsche® Performance Parts - 12v High Performance Oil Scavenge Pump - Porsche® 928 World record Holder 216.63537 mph
pair this with a small car rad and electric fan, and you got an on demand cooling solution, wich would in turn drop engine temperature.
pair this with a small car rad and electric fan, and you got an on demand cooling solution, wich would in turn drop engine temperature.
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From: Newmarket, Ontario
In the hot summer months I do the same thing when I shut down. I often thought of installing a thermostatically controlled fan to evacuate hot air from the engine bay but never got around to it. Started doing it years back when I had my Challenger RT and 340 Swinger. Heats the silent killer.
Thread Starter
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Senior User
Joined: Jan 2013
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From: Gold Country
928 Motorsports - Porsche® Performance Parts - 12v High Performance Oil Scavenge Pump - Porsche® 928 World record Holder 216.63537 mph
pair this with a small car rad and electric fan, and you got an on demand cooling solution, wich would in turn drop engine temperature.
pair this with a small car rad and electric fan, and you got an on demand cooling solution, wich would in turn drop engine temperature.
I'm mostly interested in letting the radiant heat from engine parts and exhaust manifolds collecting at the top of the engine bay escape not the oil even tho it might help a little before stopping I rather keep my fluids in operating temps when i shut off but additional coolers are good for heavy duty service or hot temperatures for sure. I just make sure i do a cool down during the last 5 minutes if I driven it hard just like any other turbo charged vehicle. I really need to find a cheap hood so I can build a vented one for the summer, it gets to 106F in my area.
In the hot summer months I do the same thing when I shut down. I often thought of installing a thermostatically controlled fan to evacuate hot air from the engine bay but never got around to it. Started doing it years back when I had my Challenger RT and 340 Swinger. Heats the silent killer.
Vented hood with a fan would be nice ey?
(21411) how's that for a garage heater? lol
Cargo Master
Joined: Dec 2007
Posts: 2,196
Likes: 120
From: Carstairs Alberta
complete and utter waste of time and money. totally unnecessary. 2 -3 blocks of light driving or coasting and exhaust temps are 25% of full throttle temps. underhood temps at full load in a hot climate are far higher and stuff already lives nearly forever under those conditions. but its your money
Posting Guru
Joined: Feb 2013
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it works great when a motor is overheating. i just make sure i stop pop it get out and make sure the safety catch is secured and drive slow enough that the wind wont catch it and flip it open. and if your that worried about it get hood vents or scoops
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