Getting the hot air out.

[Franko914]

Thanks for the movie post. Pretty much the plan I had come up with, to use a shop exhaust / cooling fan on high only I was going to light off a smoke generator in front of the grill to see if it would pull through and exit out the vents. This way is cleaner. I will go with SmithvilleD idea of securing the yarn inside the fender and see if it gets pulled/pushed out the side vents.

That would be neat. You will find most of the smoke coming out from underneath the engine compartment, past the front suspension and around the bell housing. Basically, when the fans are cranking, you can feel where most of the air is rushing out. Please post the movie (.zip allows it to be uploaded).

Before I replaced the engine-driven metal fan with the dual electrics, lifting the hood up a couple of inches with the fan clutch engaged at idle, hot air would rush out the right side above the battery. I considered placing a louver at that spot on the hood: front edge of the louver about 3 inches from the front edge of the hood, side of the louver about 3 inches from the side edge of the hood. The drastically different air circulation with electric fans (directly rearwards towards the engine, hence, much better air circulation AROUND the engine) nixed that PDQ.

 

[Gunner0812]

Nice work Paul.

 

[Paveltolz]

The louvers' vents face rearward, so even a hose soak from the front or even from an angle will not pour or heavily drip water into the engine compartment (I tried by placing a cookie pan under them). Splashing the water stream directly onto the windshield resulted in water cascading down past the wipers and, then, directed into the channels protecting the fresh air vent intakes. A bucket of water didn't do much either. You will have to direct the water stream into the louver from behind to get worry-enough water in there. You won't get any more water from up top than through the radiator. The louver design is pretty solid: narrow louvers angled rearwards.

To add a couple of cents to this, I went through the squirt-em-up today. Splurged a little and got the optimum wash which means there was a pre-soak, a couple of soup passes as well as two rinses, clear coat, rinse and spot free. After each pass over the hood the air coming out vents would push the resultant steam off the motor towards the windshield which would temporarlily fog over. I didn't even up the RPMs so it was all at idle.

I have literaly burned my hand on the louvers after a drive home from work and the hood is comparatively cool. That's a pleasant change from the hot all over I used to experience.

Well the amily visit is about over, the sod is all down on the lawn and I've got Monday off after an early jump so... I'll get the yarn out and test the vents at high idle, driving, and place a few along the fender and even figure a way to mount some out and away from the fender as has been suggested. Should be entertaining.):h

Thanks for the compliment Gunner.

 

[Pillow]

Looks great!

Granted why not just get a cowl induction hood? Just curious.

Also I am digging the wider fender flares.

 

[Paveltolz]

Looks great!

Granted why not just get a cowl induction hood? Just curious.

Also I am digging the wider fender flares.

Thanks.

About a $300+ reason not to get the induction hood plus, it doesn't help in this situation as it brings air in at the windshield and w/out a route to the air filter it would just trap the hot air under the hood. I learned a while back that the Salt Flat truck Bill runs has the cowl induction blocked off.

Flares I got through the LMC cataloge, Xenon 3" units. State requirement to have flares w/ over sized tires. I need to paint them though.

Testing the louvers may be delayed a bit. Jump yesterday was not as advertised. Beat me up pretty good plus had to go in anyway. Buisness trips coming up over the next two weeks. West a few time zones this week, home for a day and then east again. Then there's my sweet grey haired Mom who's in great need. Duty Calls there too. Wish me luck on all of it.

 

[Paveltolz]

Test with mixed results...

Along with the fender and hood test points for taping yarn to observe air flow, I tied off yarn to the inside of the hood in two places. One forward and the other towards the windshield. At idle, the fan pushed the yarn up and back as expected. I ran the RPMs up to 2000 briefly and the yarn responded as I had thought it would, up and back.
Side vent, not much observed. Wind moved it around as much as anything regardless of the truck's speed...idle or 55mph.

At 50-55, the hood vents seem to be a moving decoration of no real functionality. W/O doing temperature reads, the yard offered only a couple of observations. Observable in the video The test subject towards the windshield (passenger side) initially the air flow pulled the flowing end back into the engine compartment...then it sucked the whole thing in...never to show itself again

To be honest, over the past few days of mussing over these things, it was what I had come to believe would be the case. As a means of getting heat out at low speed or while stopped, hot air just roils out. At speed, cool air may actually be getting pulled in while the inflowing air/fan from the front end pushesn the hot air out through the bottom or, who knows, the side vents. I posted several pictures/video on the air intake thread of Leroy's. Here are a couple particular to this little issue. Road trips from the islands of the sea to NC these next two weeks. Feel free to comment or offer suggestions. I'm guessing air temp reading are next.

Paul

http://www.youtube.com/watch?v=sf5Hs5V282s
http://www.youtube.com/watch?v=iS6_Tqo7C6o

 

[SmithvilleD]

Looks like locating the hood vents towards the front of the hood might be necessary to see them pulling air out at highway speeds. In my opinion, that location isn't gonna look good on a pickup.

In doing a little searching for functional fender vents, I've found 3 options I think might could look good as well as be functional (if indeed that location would pull air out at highway speeds:


http://www.sporttruckdirect.com/Street_Scene_Fender_Vents.html

http://www.stylintrucks.com/parts.aspx?free_text=Billet+Fender+Vents&partfamilyid=3137

Cadillac Escalade - http://www.cadillacforums.com/forum...rum-2007/78713-07-fender-vents-my-03-esv.html

If pulling the splash shields around the inner fenders/suspension didn't allow in such a mess of rain water/grime, I suspect opening up that area would help pull out underhood air at speed.

 

[Matt Bachand]

Looked like the side CAI induction would work quite well at highway speeds. I think thats a winner for sure.