Pardon me while I vent (my hood)

[SUMOTOY]

Hey BENO, wouldn't water be inside the engine bay anyway? the force of the water is pushing through the grill and the radiator allowing it into the engine bay. What would have been disastrous about having the vents in that situation? Personally I'd be more worried about NOT having a snorkel. Not a whole lot of water crossing here in CA though.

Bingo. Guys if hood venting was really a problem, why would 80's have so many successful water crossings with a coil and coil wire mounted to the frame rail, some 18inches *below* the hood line, and below the stock airbox. I have never seen a reference to relocating the coil when installing a snorkel either.

3 years in driving rain, snow, and every conceivable daily abuse with hood vents, they have not adversely affected engine performance in any way. I've seen them on many stock trucks that do water crossings as well. I went thru, quite thoroughly (and not without subsequent controversy) "Sumotoy's ABC's of 80 Cooling", hoping it would stand the test of time. 3 years in, I have no corrections to make to those posts... Yet.

My .02

Scott J
94 FZJ80 Supercharged with hood vents

 

[OGBeno]

Hey BENO, wouldn't water be inside the engine bay anyway? the force of the water is pushing through the grill and the radiator allowing it into the engine bay. What would have been disastrous about having the vents in that situation? Personally I'd be more worried about NOT having a snorkel. Not a whole lot of water crossing here in CA though.

Actually after doing this water crossing, I opened the hood up and my engine bay was pretty much dry.

After reading some of Mark Whatley's explanations back in 2000, IIRC, about how dissimilar pressures inside of the engine bay create an air pocket that the water cannot actually get through, coupled with the mechanical fan which helps in creating this air pocket. I've heard this logic from other sources as well.

The bottom of my engine was wet (oil pan) but nothing else. The entire engine bay was dry.

But I agree, I should have had a snorkel. That said, I am not going to buy a snorkel for the 2-3 deep water crossings I do every year on my excursions.

I'm doing the Rubicon next week and I hear there are some serious water crossings there, so I'll report back about whether there was an water ingress into the engine compartment.

-o-

 

[Atoyot1031]

I like the idea in theory, but in practice, I am not so sure having hood vents would be a good idea....it did get much deeper than this picture shows. The water was washing up by the winshield before I got out of all of it. The truck kept going, but having hood vents might have spelled disaster for me in this situation.

Just my. $02. My truck has never overheated, nor gotten above 209 or so degrees no matter the situation...

Sounds interesting, but 40s don't have issues with watercrossings (see the latest Toyota Trails pics from the Alaska trek) and every one ever made had a vented hood.

I use my snorkel every day during the summer since it's been shown to loower intake temps for SC'd 80s. We get some decent water crossings, but it's fast moving mountain run-off. If there was water that deep around here, you wouldn't be able to drive it. Since it moves so fast you'd be washed down stream.

P.S. 'll try to get some good closeups on this thread for you nicholas.

 

[alia176]

I like the idea in theory, but in practice, I am not so sure having hood vents would be a good idea....it did get much deeper than this picture shows. The water was washing up by the winshield before I got out of all of it. The truck kept going, but having hood vents might have spelled disaster for me in this situation.

Just my. $02. My truck has never overheated, nor gotten above 209 or so degrees no matter the situation...

The purpose of the hood vents is not to lower your water temps, it's to lower your under hood temps. You have never measured your underhood temps but I bet it's way over 209 degrees. You have a black truck in the desert SW, I can bet you're exceeding 250 degrees easy.

Just my .02 cents.

 

[Atoyot1031]

The purpose of the hood vents is not to lower your water temps, it's to lower your under hood temps. You have never measured your underhood temps but I bet it's way over 209 degrees. You have a black truck in the desert SW, I can bet you're exceeding 250 degrees easy.

Just my .02 cents.

Agreed for the most part. When I discussed this with cdan, he said that he did a test on his truck with a heat soaked engine compartment idling in park. With his hood cracked open a couple inches to simulate vents, he saw ~4 lower water temps.

 

[Atoyot1031]

nicholas,
Sorry for the delay, but here are pics with measurements for the vent installation I did. There is a difference between the measurement to the edge of the vent and the actual hole cut (as you can see once you have the Lumina vents in hand). Let me know if you have any other questions.
Good luck

Nick

 

[nicholas]

Thanks Nick.

I have the vents on hand so I can see how the recessed edge you were talking about.

Would it be possible to do this with the hood still connected to the truck or is it necessary to remove it?

Those turned out really great. Nice work!

 

[Atoyot1031]

Thanks!

I wouldn't do it with the hood on for a couple reasons.

1. I used a long jigsaw blade to that I didn't get hung up on the lower portion of the bracing. I'd worry about finding hoses, wires, etc.
2. I created a significant amount of steel shards, I didn't want those under my hood.
3. My truck has about ~5" of lift and 37s. I'm 6'2", but it would have been difficult at best. With the hood off, it was easy to manuever around with the jogsaw and get nice clean cuts.

IMHO, it was worth the hassle of putting the hood back on to ensure that I got a nice clean install.

 

[citadel]

i kept the hood on but raised it open several inches by placing a large 2x4 under the front of the hood..... Make sure it is up high enough that you dont touch anything in the engine bay...

Place a blanket in the bay to catch any droppings

measure 10 times- cut once!

 

[NLXTACY]

NICHOLAS, if you decide to take off your hood, place painter's tape along the edge of the bracket on the hood and then onto the bracket itself, both along the side of the bracket and along the top of it. Then with a pen/marker make a line that goes from the hood to the bracket in several locations. Then do it on the other bracket as well. THIS will make lining up the hood again for re-install a snap. Just line up the lines on the tape!

 

[Atoyot1031]

That sounds a helluva lot better than the caveman way I went about it...

 

[Riad]

I think this is my next project. I like all the nice vents ya'll got there. I some times think about having long vent across the hood right after the firewall (kinda like the range rovers) but not sure yet. Two vents seems much easier to install without screwing things up too much, for me ofcourse .

Nevertheless, ran across this. Sounds pretty interesting, having hard time picturing this on my hood though

 

[S.CarolinaFZJ80]

No need to remove the hood to cut holes for vents. Try a Dremel with the metal cut off wheels. Works great and its very easy to control the cuts. File smooth, prime and paint. It's that easy.

Measure 10 times and cut once!