it gets hot in engine compartment,after any normal drive I open lid when I get home to dissipate heat, have acreage so no worry about passersbys,anyone else do this this or am I just OCD.

 

LOL, OCD, the car feels no pain. I understand you fully anyway. Enjoy.

 

Totally OCD, engines are not bodies and you can't apply the same logic, engines are designed to run at a certain temperature, and actually rapid cooling can damage the engine more since aluminum tends to bend with rapid cooling, of course just opening the engine lid will not cause this, but I believe the highly capable engineers at Porsche thought of how long it would take the engine to cool with the lid closed. 😜

 

There are two schools of thought on this. Leave the hood closed and let the cooling fan do its job - the fan is not what I'd characterize as an "exhaust" fan but it sucks outside air in and blows it over the top of the engine with the flow over the top of the exhaust and out through the underside. Opening the hood shuts off any fan operation and allows the heat to dissipate out the top allowing all the heat to flow over the engine on it's way out. I've done it both ways and haven't found one way more effective than the other.

 

I'll admit that I have done this a few times...Where I live temps reach 120* in the summer and my west facing garage gets full sun all afternoon....that little fan blowing in 120* outside air is not gonna do much, so I sometimes will open the hatch and let the excess heat rise out (and further heat my oven/garage!!).

 

I do it all the times, in summer.

Yves

 

I do this almost exclusively on track days, even after a cool down lap. So don't feel abnormal. We like to feel like good caretakers of our cars. The better we take care of them, the better they take care of us. If this is the most ocd thing you do with your Porsche, consider yourself very normal

 

I have not done this. But I do drive around a lot with my rear spoiler in the up position to help air flow.


Darin @ Fister ceramic coated my cans, and much cooler under there.


I also applied aluminum tape on the engine side of the coolant tank when I replaced it due to a crack last year. cant hurt to reflect heat away from those junky plastic seams that don't like to hold up to heat.

 

With exhaust parts ceramic coated, where does the heat go?

 

Less dissipates out of the can and more gets pushed out of the tailpipe.

 

So when you shut down heat stay within the system longer?

 

Two aspects ... Running with exhaust flowing through scavenges the surface heat and carries it out the tailpipe. Else not running and the heart dissipates a bit more slowly into the compartment. Picture the coating as putting a blanket on your muffler. Big deal? Not too big. But every bit helps IMHO.

 

I do this as well.

 

I do this all the time but then again I live in Puerto Rico where winter temperatures are mid 70's and summer mid 90's.

Hence, I'm not concerned with the quick cooling and aluminum warp that was pointed out. As to letting that rear electric fan do it's job... I'm more concerned with its effect on the battery since the 997.2 is very finicky about its battery not being well topped off. Just my $.02

 

I do this everyday on my 997, wifes M5, and used to do it on my old FD. Too much heat stays in after drives and cooks the plastic components in the bay over time. I did this with my wife's 2001 e46 M3, and after 130K miles, the bay components were not brittle at all.