Would a cut to the middle cowl help with temps?

[danbfree]

I have heard of cutting sections of the cowl under the area topped by screens to help with air flow... I'm wondering if maybe cutting out the area right above the turbo/crossover would help? I already have an IC and heat wrapped upgraded crossover, looking at helping with peak coolant temps when summer hits, I figure that tight area might trap a lot of heat... TIA for your thoughts!

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[Clint Beastwood]

I guess my concern there would be sucking up engine bay air into the air inlet inside the cowl.

 

[danbfree]

I guess my concern there would be sucking up engine bay air into the air inlet inside the cowl.

ahhh, but there is already a slit for some airflow there, does that shielding protect the air inlet or something?

 

[Clint Beastwood]

I know that when I had my 2j intake, every time the dv vented the car smelled like oil. I removed the 2j and left the cut cowl and the ac struggled to stay cold and I smelled more car smells. Mostly went away when I swapped to a new lower cowl.

 

[danbfree]

I know that when I had my 2j intake, every time the dv vented the car smelled like oil. I removed the 2j and left the cut cowl and the ac struggled to stay cold and I smelled more car smells. Mostly went away when I swapped to a new lower cowl.

Well, I have no intentions of ever going to a 2JR and I use a full recirc DV and nothing else that vents under the hood so not sure if I would have this issue... but you cut up the passenger side of the cowl for a 2JR and you have a venting BOV and catch cans too right? If so, that makes sense you got oily air in your case, interior is pulled from the same side... Well, I'll have to maybe just pull the cowl off and take a look around to figure out how it all works, I think the person that cut theirs cut out did under the *driver* side of the 3 screened areas, maybe to avoid this issue, so at least I'm getting more ideas and visualizing it better now, so thanks for the feedback!

 

[AZSP33D]

The passenger air intake grill is isolated from under hood air and vapours odors gases etc. so modifying will stink up the interior, especially with breathers if the crankcase ventilation was modifyed. Recommend a small aircraft type CO detector inside the car at minimum if you do this... and as far as cooling, this is a high pressure area on top of the hood so not good at evacuating underhood airfow anyway. Better options would be venting behind the front wheels, above the front wheels, and the front half of the hood for hood vents.

 

[danbfree]

The passenger air intake grill is isolated from under hood air and vapours odors gases etc. so modifying will stink up the interior, especially with breathers if the crankcase ventilation was modifyed. Recommend a small aircraft type CO detector inside the car at minimum if you do this... and as far as cooling, this is a high pressure area on top of the hood so not good at evacuating underhood airfow anyway. Better options would be venting behind the front wheels, above the front wheels, and the front half of the hood for hood vents.

So, I guess I just have never looked close enough and understand how the cowl already has slits in there anyway and how that all works, can you explain where the air intake grill is actually at? If it's actually isolated it means I could cut other areas, right? But good info on the rest, I was considering hood vents more toward the front, but the reasonably priced ones (Carbon Motorsports) are no longer being made and I have no intentions of spending more on some stupid hood vents than just getting a new radiator, LOL.

 

[Clint Beastwood]

So, I guess I just have never looked close enough and understand how the cowl already has slits in there anyway and how that all works, can you explain where the air intake grill is actually at? If it's actually isolated it means I could cut other areas, right? But good info on the rest, I was considering hood vents more toward the front, but the reasonably priced ones (Carbon Motorsports) are no longer being made and I have no intentions of spending more on some stupid hood vents than just getting a new radiator, LOL.

On fiats a lot of people removed the rubber gasket at the rear of the hood, it moved a lot of air but it wasn’t a substantive difference and tanked fuel economy for some.

 

[danbfree]

On fiats a lot of people removed the rubber gasket at the rear of the hood, it moved a lot of air but it wasn’t a substantive difference and tanked fuel economy for some.

Interesting, I'd just like to help with the low pressure from under the hood that really seems to trap a lot of heat... there must be something I can do, other guy had interesting ideas about venting from the wheel wells, I'm sure just creating some venting will help with the pressure, then again most people who care about heat just get an upgraded radiator, which I'm very likely to order soon once I get the tax return.

 

[PunkST]

Honestly you are better off cutting the hood for a proper naca duct. And then making the required shroud underneath to blast air down the back side of the engine. Take advantage of the air thats moving over the car.

 

[TyphoonFiST]

I got a spiffy Carbon Fiber NACA duct if anyone needs one.....ill shoot a picture of it today. I used one on my Typhoon for a True CAI and it worked out great!

 

[danbfree]

Never heard of a NACA duct, is this like some RAMAIR hood scoop?

 

[MagnetiseST]

Never heard of a NACA duct, is this like some RAMAIR hood scoop?

No, its a proper duct.

https://en.wikipedia.org/wiki/NACA_duct

They look similar to the ones on the hood of the Ferrari F40, but more commonly these days have a 3" outlet to accommodate ducting / airflow to a specific system (like brakes)

 

[Shikari]

Are you using heat wrap or heat tape on your cross over pipe? Reason I ask is if you're using Heat Wrap like the DEI Lava Rock stuff you're not doing yourself any favors. If anything you're adding to the heat soak.

 

[danbfree]

No, its a proper duct.

https://en.wikipedia.org/wiki/NACA_duct

They look similar to the ones on the hood of the Ferrari F40, but more commonly these days have a 3" outlet to accommodate ducting / airflow to a specific system (like brakes)

Cool link, TIL! I've "heard" of these before actually, after seeing this, cool how it's named after the predecessor to NASA! So yeah, I was considering hood vents a little further forward than most mount them to be actually functional, but with Ron/Whoosh saying the affordable Carbon Motorsports are discontinued I've only seen super cheap fake ones just for looks and it's not something I'd want to pay more than the $60-80 the CM ones were, but I'll keep looking! I know it's not a "true" NACA, but could be mounted to be close to that I think...

 

[danbfree]

Are you using heat wrap or heat tape on your cross over pipe? Reason I ask is if you're using Heat Wrap like the DEI Lava Rock stuff you're not doing yourself any favors. If anything you're adding to the heat soak.

I know it's hard to tell exactly from the pic, right? I had a buddy donate a heat blanket, so I trimmed it to wrap that middle hottest section and picked up some ~$8 heat tape off Amazon to tape it in place and wrap the rest of it... pretty cool you can get gold, black, silver, etc in heat tape, I just grabbed silver because it was cheap and had good reviews and it definitely helped right away!

 

[Shikari]

I know it's hard to tell exactly from the pic, right? I had a buddy donate a heat blanket, so I trimmed it to wrap that middle hottest section and picked up some ~$8 heat tape off Amazon to tape it in place and wrap the rest of it... pretty cool you can get gold, black, silver, etc in heat tape, I just grabbed silver because it was cheap and had good reviews and it definitely helped right away!

Yeah, I can't tell with my eyes. I did find these on a thread a few months back:

https://cmcomposites.co.uk/shop/fiesta-parts/fiesta-wrc-bonnet-vents

https://www.fiestastforum.com/threads/hood-vents-and-under-hood-temps.20888/page-4

 

[danbfree]

Yeah, I can't tell with my eyes. I did find these on a thread a few months back:

https://cmcomposites.co.uk/shop/fiesta-parts/fiesta-wrc-bonnet-vents

https://www.fiestastforum.com/threads/hood-vents-and-under-hood-temps.20888/page-4

Good thread,thanks for that info! But yeah, for $285 I can get an actual upgraded 2 row thicker than stock radiator upgrade, so I'm leaning that route... If I could get the CM for $65 from Ron then it would be a different story, but $300 for some hood vents? Uh, no way.. LOL.

 

[PunkST]

If you want to keep the hottest part of the bay cooler, the duct is really the only option apart from fitting a turbo blanket. to solve the radiant heat coming off the turbo/manifold/downpipe. A bigger rad isnt going to change how hot that area gets.

 

[TyphoonFiST]

Here is one at work on My Typhoon... thought I had a better picture. But it's on the hood passenger side

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