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Old 24th March 2016, 11:29   #1
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Default Do we need to keep the hood up to cool the engine after a long drive?

Do we need to keep the hood open after a 500KM drive? Does this help the engine to cool off after a long drive? Or is this not required for modern engines?
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Old 24th March 2016, 11:33   #2
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Default re: Do we need to keep the hood up to cool the engine after a long drive?

Never ever done this on either my old wagon r or my current sail.

Both have routinely been driven non stop for over eight hundred kilometres.

By non stop I mean non stop with only halt being for fuel at 450 kms.
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Old 24th March 2016, 11:33   #3
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Default re: Do we need to keep the hood up to cool the engine after a long drive?

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Originally Posted by sibitg View Post
Do we need to keep the hood open after a 500KM drive? Does this help the engine to cool off after a long drive? Or is this not required for modern engines?

As long as your temperature gauge shows the usual expected level i don't think its required. I have done several trips of 500kms and have never done anything like this. Never had to in fact.

Cheers,
Raj
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Old 24th March 2016, 11:52   #4
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Default re: Do we need to keep the hood up to cool the engine after a long drive?

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Originally Posted by sibitg View Post
Do we need to keep the hood open after a 500KM drive? Does this help the engine to cool off after a long drive? Or is this not required for modern engines?
Opening of hood was required to be done for old generation engines wherein the heat levels were uncontrollable. Over a period of time more refined and tuned engines have made their way below the hood and in turn this tedious process fraught with dangers have subsided.
Keeping the hood open under any condition without actual supervision of specialist can lead to complications in the engine owing to any foreign object making way into the engine compartment and thereby brushing the pumps or parts.
As suggested by other bhpian, unless your temperature gauge is reflecting optimum engine temperature, the need of any rocket science is dispensed with.
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Old 24th March 2016, 11:57   #5
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Default re: Do we need to keep the hood up to cool the engine after a long drive?

Its not required in modern cars. I have done more than 500 kms. in Gujarat's hot temperature and as long as there isn't anything wrong with the car or unless the temperature gauge indicates higher than normal temperature, never opened hood of any of my cars. This is where I believe that a temperature gauge is an absolute must.
Opening hood after 400-500 kms. drive an old concept similar to high revving engines before shutting them down.

Last edited by aaggoswami : 24th March 2016 at 11:58.
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Old 24th March 2016, 12:05   #6
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Default re: Do we need to keep the hood up to cool the engine after a long drive?

No need to keep the hood up to keep the engine cool as such. It reminds me of the bygone era - Ambassadors fitted with Matador engines - which needed it frequently.

As long as the car is being driven, the airflow ensures that the excess heat is dissipated. The engine room temperature settles around 90 deg.C. All parts in the engine room are designed for it.

But when the car is resting after a long drive, the engine room temperature continues to raise in absence of air flow. It may reach as high as 110 deg.C. Although the plastic parts and electrical parts are designed to withstand this much of temperature, I always felt to keep the hood open so that the excess heat is not trapped and plastic parts don't degenerate. This I do it for my modern classic car Mercedes W124, just for the peace of mind. I don't do it for other cars which are more modern.

If you travel long distances very frequently with heavy load and in summer and you have an older car, it is a good idea to do it. But also be aware of other factors like safety and convenience which are more important.

Last edited by Ravindra M : 24th March 2016 at 12:09. Reason: Revision
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Old 24th March 2016, 13:35   #7
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Default re: Do we need to keep the hood up to cool the engine after a long drive?

The truth is any car engine is relatively cool after a long distance highway run, As there is constant air flow to the radiators. I have covered 800 km in a single day in my safari and have observed the engine temperature to be below normal than what's within city limits.

Do follow the turbo idling http://www.team-bhp.com/tech-stuff/i...o-charged-cars if it's a Diesel.
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Old 24th March 2016, 16:44   #8
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Default re: Do we need to keep the hood up to cool the engine after a long drive?

Only if you really have to park in a NO PARKING zone for some reason and you are worried about traffic cops giving you a ticket.
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Old 24th March 2016, 16:54   #9
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Default re: Do we need to keep the hood up to cool the engine after a long drive?

Modern liquid cooled automobiles engines are designed to perform for long hours without a stop.
What you need to keep an eye on is the temperature gauge ( if provided). If it is steady in the same position where it normally settles after about 15 km of drive, then there is no need to worry.
What you could do to help your car is to idle it for a few minutes before shutdown whilst stopping on the highway for a quick bite.
The engine temp goes up a bit because the water pump is no longer able to circulate the coolant. The coolant in the cylinder will be static and heat up a bit. Therefore, a few minutes of idling after racing down the highway is a help.
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Old 24th March 2016, 17:22   #10
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Default re: Do we need to keep the hood up to cool the engine after a long drive?

It is not required. But I sometimes do it if I want to cover my car immediately after returning home. Keeping the hood up for ten minutes dissipates the heat fast, enabling me to cover it quickly.
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Old 24th March 2016, 17:30   #11
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Default re: Do we need to keep the hood up to cool the engine after a long drive?

Honestly, I don't think it was required for the older generation cars either. Must be a wise guy who wrongly thought it'll cool his car, and then every other dude followed him (much like the habit of starting the hazard lights in tunnels or the right blinker to say 'overtake me').

As Ajay & Ravindra said, there is ample air flow at highway speeds. My Jeep is an old-school vehicle and I've never had to keep the bonnet open to 'cool her off' either.
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Old 24th March 2016, 17:35   #12
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Quote:
Originally Posted by sibitg View Post
Do we need to keep the hood open after a 500KM drive? Does this help the engine to cool off after a long drive? Or is this not required for modern engines?
When parking the car in the garage after a long drive, I let the engine idle for a minute( turbo being the reason), check all lights and gauges and switch off the engine.

If no one's looking I kiss the steering wheel boss :-)
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Old 24th March 2016, 17:51   #13
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Default re: Do we need to keep the hood up to cool the engine after a long drive?

Well, if you are so keen on cooling your car, its not after a 500kms long drive. Its after that 2km traffic jam on the way back home.

Seriously, long drives means plenty of air into the engine bay and the engine runs muh cooler. Whereas bumper to bumper traffic is where the cooling system works hard.

In any case, opening the bonnet is not required. Cars are much more evolved nowadays
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Old 24th March 2016, 17:52   #14
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No rational reason to do this unless your car overheats and steam jets ensue. Then also better to let things be at standstill for an hour before opening hood. Potentially avoiding steam burns. Overheating is more likely in city stop and go traffic than constant highway cruise.
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Old 24th March 2016, 17:53   #15
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Default re: Do we need to keep the hood up to cool the engine after a long drive?

The only equally crazy thing we did on a frozen day in jersey was to pour hot water on an old honda engine to give it some heat. Funnily it worked and we still have a laugh about it.

Exactly opposite to cooling and totally functional. So I would say it will surely help but is it required probably not in modern cars.
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