I doubt it in hot conditions. After you turn the engine off, the fan isn't moving anymore and the engine temp rises quite a bit really fast. I questioned my dad about the practice of cooling down the engine (turbo) in his plane. I mentioned about the sudden rise after engine shutdown. It does spike. A lot of his engine is logged and can be reviewed on a computer later.

yeah heat soak.
Now does a bag of ice on the intercooler of turbo cars really work?

when I first got the car, for several months, I opened the lid when I got home to see and hear the engine runs before I come in :D

I know you can harm a light airplane engine and cause cracking around injectors and such by pulling power and descending while full rich. I figured if the engine ( my 911's ) was in static air then no harm could come of it. I guess by opening the lid you increase the convective cooling flow quite a bit though.

If you have been on the boost, then the IC will be hot. The ice will make a bag of water, but that's it. No engine cooling at all. Best to let it run a few minutes instead.

I think he was kidding....

I often check the oil level after I get home. The car will be parked in the same spot on a level garage floor. When I shut it off I close the lid. If it cools down in 2 hours instead of 4 what difference does it really make? At the autocross the engine never gets that hot to make a difference.

If its really hot out or I've been running it hard I'll let the engine idle for 30 seconds in the garage. After it is shut off I'll pop the hood.

Did ya notice the engine lid has a big rectangular opening on it?? I guess Porsche engineers did that for cooling purposes. When I want to cool down my house, I do not feel the need to open the screen door either ;).

I did raise the lid...under the "can't hurt-might help" theory...I do the same to my now H20 cooled cars...to keep wax melting heat off the hood...

I figure it is easier on the rubber if you pop the hood, especially if you just got done getting it really hot

Are you talking about your car or your sex life? :)

:DA930
That's similar to what I do; but I'll drive the last minute or so at low load/high RPM. My thinking is that the fan speed is brought up, and the cylinders are pumping mostly air. --pumping air thru, inside and out. ...and because the car is moving, recirc is not an issue.

Just like how race cars speed up when they hit the grass ;)