what are you guys saying now.......you mean it closes?

 

I jump right into stuff like this... Sorry!



So the question is, how much more heat comes out with the hood open vs with the hood closed? Answer is... it's the same. Leaving the hood closed slows the migration of heat from the top of the engine, but eventually it all reaches an equilibrium. Faster with the hood open, but still the same calories/BTU's/whatevers are shed from the engine.

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I pop the hood when I get home to hasten that heat migration and avoid heat-soak deterioration of the bits on top of the engine.

Ed's picture of the crispified knock sensor is interesting, part heat and part chemical damage. The PVC jacket on those cables suffers when engine cleaning involves brake cleaner and other harsh solvents. I'm not sure there's a good solution, since they also sit right on top of the hot lump anyway. No good way I can think of to hold the cable off the bottom of the V.

 

So, I am the only one the not only opens the hood, but puts a fan on it?

 

I do open it to look at the engine sometimes - not that much, but I don't do it to let the heat out - and I'm guessing I have a bit more heat than most of you...

Alan

 

I do this routinely; good to know I'm not alone!

 

In the summer I always leave it open outside before I garage it.

In the winter-closed. Gives me a heated garage!

 

I used to pop it open because of the scorching underhood temperatures. But after I installed the modified belly pans, the engine never felt that hot anymore, so I stopped doing it.

 

I do the same thing during the summer for the aforementioned heat purposes.

 

So glad I'm not alone in this opening the bonnet after a run thingie.

 

I'm sorry guys but, don't you think you're being a bit excessive? 'OMG, the engine's HOT! *Opens hood* Breathe, baby! BREATHE!'
It's a CAR, gentlemen and gentlewomen. It's designed to get hot.

And as a side note - I don't know why Porsche didn't just put an electric fan in instead of the hydraulic one. My 924 has the factory electric fan still installed and continues running after shutoff until it gets to a certain temperature (not timed, sometimes turns back on on hot days after running), making opening the hood obsolete

 

Later cars have exactly this...

Alan

 

I pop my hood every time I get fueled up....so everyone else can enjoy the majesty that is 928....

 

Oh, and I don't close it until the moment I drive away....

 

Good plan. And check the oil even though you don't need to; makes having the hood open look legit.

In fact, check the oil again every time a new person comes near; it draws focus to the engine.

Doesn’t opening the hood disable the electric fans on some cars?

 

On a hot day after a drive I turn the key back on to let the fans run some to cool down the
radiator then start the car again to let the engine cool some for a minute or two you can see the temp gauge drop right away.
Wash it towel dry under the hood,door jams,under hatch area almost after each drive then put away.