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Open the engine lid or let the fans kick in?

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Old 08-02-2012, 08:23 AM
  #31  
slicky rick
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dan that is exactly what i do. use the box fan. a few minutes and most parts are touchable.
Old 08-02-2012, 08:56 AM
  #32  
jhbrennan
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Originally Posted by Macster
Put me down on the side that says let the fans work, leave the lid closed.

I have not read all posts so pardon if this is a repeat of what someone else posted.

The fans drive the hot air down and out from the engine compartment.

This is for a very good reason: The hottest parts are the exhaust hardware and these are the bottom of the engine/engine compartment.

If the lid is opened, the hotter air rises and "bakes" the cooler engine parts, the wiring and hoses mainly, which are more affected by higher temps.

Let the fans blow this hot air away from those critical wiring/hoses as the good engineers at Porsche intended.

Sincerely,

Macster.
I never understood why the fan isn't an exhaust fan - heat rises and there is limited space under the car and certainly more space over the car so why doesn't the fan pull the hot air out instead of blowing it down?
Old 08-02-2012, 09:14 AM
  #33  
gota911
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Originally Posted by jhbrennan
I never understood why the fan isn't an exhaust fan - heat rises and there is limited space under the car and certainly more space over the car so why doesn't the fan pull the hot air out instead of blowing it down?
Macster stated the reason. Maybe you missed it.

Originally Posted by Macster
Put me down on the side that says let the fans work, leave the lid closed.

I have not read all posts so pardon if this is a repeat of what someone else posted.

The fans drive the hot air down and out from the engine compartment.

This is for a very good reason: The hottest parts are the exhaust hardware and these are the bottom of the engine/engine compartment.

If the lid is opened, the hotter air rises and "bakes" the cooler engine parts, the wiring and hoses mainly, which are more affected by higher temps.


Let the fans blow this hot air away from those critical wiring/hoses as the good engineers at Porsche intended.

Sincerely,

Macster.
Old 08-02-2012, 09:25 AM
  #34  
No HTwo O
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I park in the garage. Open the rear lid on the Turbo, the Boxster stays closed, and then turn this fan on (about $100 at Grainger), placed by the front of the car. I try to leave the garage door open for a little while too.
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Old 08-02-2012, 09:45 AM
  #35  
nkelley
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I open the rear lid to release the hot air! The fan is there to cool off the engine because most car drivers are not going to remember to leave there engine lids open, outside or in there garages. I look at it as a safety precaution by Porsche.

Releasing the hot air sooner vs leaving the hot air in the compartment too me makes more sence. It most likely is all psychological but it makes me feel better.

I beleive the engine cools faster when the lid is open!

NK
Old 08-02-2012, 10:57 AM
  #36  
Quadcammer
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folks...honestly?

just leave the car be for christs sake. it will be fine...trust me.
Old 08-02-2012, 11:23 AM
  #37  
mgordon18
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Originally Posted by Quadcammer
folks...honestly?

just leave the car be for christs sake. it will be fine...trust me.
Love this guy...

I actually bought a lift and engine stand so after each long drive I can drop the engine out of the car and let it cool separately from the rest of the car's components. Makes a big difference and only takes a few hours on each end of a drive!

Couldn't resist.
Old 08-02-2012, 11:27 AM
  #38  
No HTwo O
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Originally Posted by Quadcammer
folks...honestly?

just leave the car be for christs sake. it will be fine...trust me.
But I am not shooting for "fine". I want a little better than just fine.
Old 08-02-2012, 11:33 AM
  #39  
Tcc1999
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Originally Posted by Quadcammer
folks...honestly?

just leave the car be for christs sake. it will be fine...trust me.
Thanks, I couldn't bring myself to write this ^. Reminds me of discussions we had in Grad School - interesting topics, useful in helping us shape our thinking, but ultimately pedantic and without much scientific value-add. (To wit, it may or may not be efficacious to open the lid, plenty of arguments either way - but has anyone ever encountered engine problems, or is there any documentation, from excessive heat build-up?)
Old 08-02-2012, 12:17 PM
  #40  
Quadcammer
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Originally Posted by No HTwo O
But I am not shooting for "fine". I want a little better than just fine.
Do what you want man. I just don't want to live a life where I really have to spend time worrying about whether I need to raise the hood on my car after a drive due to concern over it not being "better than fine".

own the car, not the other way around.
Old 08-02-2012, 12:48 PM
  #41  
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Thread to 10 pages in...........
Old 08-02-2012, 12:52 PM
  #42  
66mustang
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Originally Posted by mgordon18

I actually bought a lift and engine stand so after each long drive I can drop the engine out of the car and let it cool separately from the rest of the car's components. Makes a big difference and only takes a few hours on each end of a drive!
This is a genius idea. I am going to have to do this.
Old 08-02-2012, 12:54 PM
  #43  
Dr.Bill
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Originally Posted by Quadcammer
own the car, not the other way around.
I like that! I'm going to go have a talk with the R8 now.
(I also leave the hatch closed on the R8 and let the fans put in there by the smart Germans do their thing.)
Old 08-02-2012, 12:55 PM
  #44  
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Originally Posted by RayDBonz
I like that! I'm going to go have a talk with the R8 now.
thats the spirit
Old 08-02-2012, 01:05 PM
  #45  
RollingArt
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Originally Posted by Quadcammer
thats the spirit
Paging Quad, paging Quad.

Quad, you are needed on aisle 987...


.
https://rennlist.com/forums/showthre...ferrerid=68228


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