Does my engine compartment fan work?
06-02-2005, 05:46 PM
#17
Addict
Rennlist Member
Rennlist Member
Join Date: Dec 2001
Location: SF bay area, CA
Posts: 2,094
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by 1999Porsche911
Just tap into the connection wire and put a switch in the cockpit. Then you can turn the fan on manually. It makes a big difference sucking cooler air into the engine compartment.
06-02-2005, 06:07 PM
#20
Maybe I'm missing something, but the fan always runs when the engine is running on the turbo. When the engine is off, it only runs when the engine compartment is hot.
As far as opening the hatch after a DE session, the point of the fan is to keep the hot (mainly exhaust heat) air out of the engine compartment. Opening the hatch shuts the fan off (of course) and lets the heat pass over the engine and components, but escape out the hatch by convection. Probably a breakeven scenario - the only upside would be avoiding running the fan for long periods with the engine not running.
As far as opening the hatch after a DE session, the point of the fan is to keep the hot (mainly exhaust heat) air out of the engine compartment. Opening the hatch shuts the fan off (of course) and lets the heat pass over the engine and components, but escape out the hatch by convection. Probably a breakeven scenario - the only upside would be avoiding running the fan for long periods with the engine not running.
06-02-2005, 07:14 PM
#22
Addict
Rennlist Member
Rennlist Member
Join Date: Dec 2001
Location: SF bay area, CA
Posts: 2,094
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by leedav
has to do both... hot out, cold in. Out the top works better b/c it is aided by convection.
06-02-2005, 07:41 PM
#24
Three Wheelin'
Thread Starter
Join Date: Jan 2005
Location: Portland, Oregon
Posts: 1,348
Likes: 0
Received 0 Likes
on
0 Posts
huh? how does it do that? it reverses polarity to blow and suck?
What blows, sucks. If it exhausts air, it must be pulled in from somewhere. If it admits air, it must exit somewhere.
06-02-2005, 07:55 PM
#25
Addict
Rennlist Member
Rennlist Member
Join Date: Dec 2001
Location: SF bay area, CA
Posts: 2,094
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by leedav
What blows, sucks. If it exhausts air, it must be pulled in from somewhere. If it admits air, it must exit somewhere.
ah, i thought you meant it does double duty throught the same fan opening.
what you are saying makes sense. convection helps if the fan sucks the air out but apparently it does the opposite of what you are thinking.
06-02-2005, 08:00 PM
#26
Originally Posted by karlooz
ah, i thought you meant it does double duty throught the same fan opening.
06-03-2005, 09:17 AM
#30
Originally Posted by C4S Surgeon
Are you saying it sucks and blows at the same time? Hmmmmmm. Are we still talking about fans?
If you guys keep it up, I am going to get in trouble at work . . .