Wheel Well Vents? - FFCars.com : Factory Five Racing Discussion Forum

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post #1 of 14 (permalink) Old 05-06-2017, 05:44 PM Thread Starter
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Wheel Well Vents?

Hi all,

In my ongoing quest to make the car more suitable for longer trips, I'm always looking for ways to control heat. I built mine as a street car, no hood scoop, under car exhaust. While researching, I found this on the ERA site. They have optional vents in the wheel well that reportedly vent heat from primary exhaust. Anyone have them? Worthwhile? Send your thoughts

John

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post #2 of 14 (permalink) Old 05-06-2017, 07:28 PM
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Are those installed in the elephant ears behind the front wheels? If so, how would they really vent the heat from the exhaust out of the engine bay?

If you wanted to get some fresh air to the exhaust, I think you could put a couple of vents in the side aluminum panels in the nose and then route a hose toward the headers. But then you need to figure out how to get the hot air out of the engine bay. I think pushing more air into the engine bay (more than is already coming through the radiator) just increases the chance that it will make it through into the cockpit (since very few of our cars get a great seal around the firewall and the sides of the footboxes).


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post #3 of 14 (permalink) Old 05-06-2017, 07:48 PM Thread Starter
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Those were the only photos I could find, but the ears behind the wheels was my guess, and I was also wondering how they would be effective, which is why I threw it out there as there are better minds than mine on the forum. Ive often wondered how much air moves in the engine bay, since much of what comes in would be heated by the radiator. Does it get trapped under the hood and contribute to heat soak?

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post #4 of 14 (permalink) Old 05-06-2017, 10:44 PM
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So those are in front of the headers and the usual fender vents are behind them. To me it is very questionable what the air flow would be in that area. From the point of view that any air flow is a good thing to help dissipate heat, 'maybe' they would help. Since heat rises, I'd be a lot more confident that similar vents in the hood above the headers would help.

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post #5 of 14 (permalink) Old 05-07-2017, 03:31 PM
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I made my own... The air is probably very turbulent in that area but I think any way to get some extra air movement past the header will aid in cooling.
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post #6 of 14 (permalink) Old 05-07-2017, 03:44 PM
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As much as you want to keep a flat hood, adding vents / louvers / some opening to get the heat out will be most effective.

I have them in my hood, and it gets heat out.

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post #7 of 14 (permalink) Old 05-07-2017, 08:40 PM
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Those vents are usually combined with sheet metal that surrounds the primary pipes. That kind of vent was actually used on some of the original competition cars for extra cooling. Basically, the engine compartment is at positive pressure, so the air will/should exit out the wheel-wells.
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post #8 of 14 (permalink) Old 05-11-2017, 02:17 AM
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I made my own about 10 years ago. Very simple to do, nothing fancy. Place them high up up the ears. The goal is to bring the cooler air in from the top of the wheel well, over the top of the headers, and down the face of the foot box. It's actually pretty effective.

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post #9 of 14 (permalink) Old 05-25-2017, 02:36 PM
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"Controlling heat". This makes a lot of difference.I run it from the engine to the beginning of the side pipes.Also comes in 50' & 60' rolls.Great product ! I believe its a mixture of fiberglass & Titanium.
>> LEDAUT Heat Shield Insulation with Ties for Pipe 16' Roll Titanium Motorcycle Exhaust Tape Thermal Protection Hardware Hardware Accessories Hardware
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post #10 of 14 (permalink) Old 05-26-2017, 01:12 AM Thread Starter
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Thanks Recon,

I've been scared off of wraps by all the horror stories of them rotting out pipes, especially since I live in humid coastal S. Florida, trying everything else I can think of.


John


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post #11 of 14 (permalink) Old 05-26-2017, 01:27 PM
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I hear you John...I had the headers taped for 5 years on my 68 427 vet.Then one day I dropped a good amount of oil on them, on the passenger side.Removed the tape and found no more than usual rust. And that was driving in N.Y.s weather.But down here the cobra has never been in the rain,not even a puddle. And is kept in heated garage.As extra protection (in your humid location).You could prep the headers and give them 2 coats high temp heat paint (bake paint on as per directions) then wrap them.The tape Will reduce that heat problem,noticeably
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post #12 of 14 (permalink) Old 05-26-2017, 03:08 PM Thread Starter
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Wish I could say that I've never been wet, rain seems to seek me out. Let's just say that I have throughly tested the top for its waterproofness. This was a drive back from our club spring cruise last month.

https://youtu.be/srcA8T0qpvg

But, I'm getting to the point that I'm thinking I'll wrap and deal with problems later if they appear. I'm UTC exhaust with Ford stainless shorty headers that are ceramic, and stainless pipes and mufflers, so maybe I'll be ok.

John

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post #13 of 14 (permalink) Old 05-26-2017, 03:17 PM
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They also make a sealer to brush/spray on over the wrap for protection.
WOW I'd crap, if cough in that rain.Its a hand full on dry pavement.Besides I keep the underneath as clean as the body.
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post #14 of 14 (permalink) Old 06-01-2017, 04:49 PM
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John,
I know we were discussing heat leaks. Here is what I discovered on mine, after the 1200 mile sweaty DSCC cruise. Maybe this would be a factor for yours too.

I have the Vintage Air Deluxe heater. Not the one FFR sells. It has an electrically controlled heater control valve. One would ASSUME that when you turned the fan off the heater valve would close. Or at least, when you turn the fan off and then turn the temperature knob to cold, the heater control valve would close. How it really works is when you turn the fan off the whole unit is depowered and the heater control valve just stays wherever it was. I now know that I have to put the temp on cold, wait a few seconds, and then turn the fan off. Not a very logical design. But at least I no longer have heat rolling out from behind the dash.

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