Spal Fan for IC upgrade

Jackstand Queen · 12-08-2008, 03:38 PM

I have a question: should the fan mounted under the IC suck air from above the engine lid, or should it blow air up through the vent in the engine lid?

Experience based, or theorhetical explanations are requested.

masagsxr · 12-08-2008, 03:44 PM

I believe you will want to blow air out to releave the heat from the whole engine bay. It just makes more sense that way

If you suck fresh air in,it still traps the heat in the engine bay.

ToyotaTechGeek · 12-12-2008, 02:26 PM

so many theories on this...
regardless, i blow mine up through the lid.

mr2tim · 01-07-2009, 10:13 PM

My experience was building a fiberglass reinforced engine lid made out of 1/8 inch wood wall paneling 4 inches high with 3 radiator fans sucking air out of the engine cover.

My theory on this is that as the air rushes over the top of the car a vacuum is created behind the rear back glass/engine cover area causing air to move upwards..

I decided on my design because I didn't think one fan would move enough air whereas 3 fans sucked all parts of the engine compartment not just the one over (under in ya'lls case) the I.C.

Later I designed a huge scoop that blew air down onto the I.C. (and which allowed me to fill it with ice before the race). Unfortunately at 140mph the scoop was too large and disappeared one night racing flat out on the Florida Turnpike.

Quote:

Originally Posted by Jackstand Queen

I have a question: should the fan mounted under the IC suck air from above the engine lid, or should it blow air up through the vent in the engine lid?

Experience based, or theorhetical explanations are requested.

Jackstand Queen · 01-08-2009, 01:29 PM

Man, you is Crazy. But a good kind of Crazy.

You remind me of my passing ettiquette on the long straight 2 lane highways in Nevada.

People constantly are passing badly and forcing oncoming non-passing traffic to go onto the shoulder to avoid a head on.

I force the bad passers to go onto the shoulder of the road to my right. Its so fun to see the look on their faces as they avoid a head on.

I'm still wavering on a Spal fan pushing up out of the engine bay, or going Water 2 Air IC. Where I live, there's only a week or so a year that temperatures hit near 100 F. So that's a factor too.

12-08-2008, 03:38 PM	#1 (permalink)
Jackstand Queen Cage Fighter Join Date: May 2008 Posts: 677 Thanks: 52 Thanked 56 Times in 53 Posts iTrader Rating: (1/100% )	Spal Fan for IC upgrade I have a question: should the fan mounted under the IC suck air from above the engine lid, or should it blow air up through the vent in the engine lid? Experience based, or theorhetical explanations are requested.

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12-08-2008, 03:44 PM	#2 (permalink)
masagsxr Cage Fighter Join Date: Sep 2008 Location: Norwalk, CA Posts: 3,236 Thanks: 1 Thanked 76 Times in 76 Posts iTrader Rating: (1/100% )	I believe you will want to blow air out to releave the heat from the whole engine bay. It just makes more sense that way If you suck fresh air in,it still traps the heat in the engine bay.

12-12-2008, 02:26 PM	#3 (permalink)
ToyotaTechGeek Giapetto is NOT my dad! Join Date: Mar 2005 Location: ...boosting mid-corner Posts: 568 Thanks: 7 Thanked 13 Times in 13 Posts My Google Map iTrader Rating: (1/100% )	so many theories on this... regardless, i blow mine up through the lid.

01-08-2009, 01:29 PM	#5 (permalink)
Jackstand Queen Cage Fighter Join Date: May 2008 Posts: 677 Thanks: 52 Thanked 56 Times in 53 Posts iTrader Rating: (1/100% )	Man, you is Crazy. But a good kind of Crazy. You remind me of my passing ettiquette on the long straight 2 lane highways in Nevada. People constantly are passing badly and forcing oncoming non-passing traffic to go onto the shoulder to avoid a head on. I force the bad passers to go onto the shoulder of the road to my right. Its so fun to see the look on their faces as they avoid a head on. I'm still wavering on a Spal fan pushing up out of the engine bay, or going Water 2 Air IC. Where I live, there's only a week or so a year that temperatures hit near 100 F. So that's a factor too.