Vents for Exhaust Cooling - Question

Grubby · #1 (**permalink**) 07-10-2013, 06:10 PM

I just received a pair of ERA inner fender vents for exhaust cooling. They look a bit different then some I have seen.

I thought the newest cars used a vent that was triangular shaped. The parts I got are right angle shaped.

Are these correct for #755? I want to be sure before I cut the inner venders.

Thanks.
John

ERA 778 · #2 (**permalink**) 07-10-2013, 06:40 PM

Those look just about like the ones I have on #778.

They must work because I don't seem to have any excess heat problems under the hood!
Hal

Grubby · #3 (**permalink**) 07-11-2013, 05:38 AM

Hal,

Thanks. The problem I am trying to improve is the temperature of the air thru the vents in the cockpit. They are completely useless long runs when everything is heat soaked.

My car gets driven and I would like some cooling for me and my wife.

John

BAsque1 · #4 (**permalink**) 05-02-2015, 10:30 AM

Quote:

Originally Posted by Grubby

Hal,

Thanks. The problem I am trying to improve is the temperature of the air thru the vents in the cockpit. They are completely useless long runs when everything is heat soaked.

My car gets driven and I would like some cooling for me and my wife.

John

Hi John:
Do you have ceramic coated headers? that makes a huge difference, I just did mine last year and the temperature of the cockpit did go down quite a bit, Happy Wife happy Ride

Cheers
Lou

Grubby · #5 (**permalink**) 05-02-2015, 08:12 PM

Lou,

I am currently between Cobras, but the last on had ceramic coated headers. I drove it on some long trips without the screens and then installed them and drove it on some long trips.

No noticeable change in cockpit temp and didn't really notice the engine compartment getting any dirtier.

All I noticed was my wallet getting $200 lighter, and the vents did look cool.

John

DonC · #6 (**permalink**) 07-11-2013, 07:09 AM

Look just like mine in 684. Every bit of venting to get the heat out of the engine bay helps.
Do you have a heater installed? If you do don't forget to close the petcock for summer operations.
DonC

ERA 778 · #7 (**permalink**) 07-11-2013, 11:58 AM

To help cool the interior I added two boat bilge blowers that I got from Overton's. Mounted them on top of the header shields and used the same ducting as before, just cut it to fit the blowers in place. They help some, but the interior can still get hot in the summer sun! I'll try to find a photo of the installed blowers.

lippy · #8 (**permalink**) 07-11-2013, 12:21 PM

Those vents are exactly the same as mine, ERA 797. I also installed the optional heat shields (you could even make those yourself with sheet aluminum) and added some extra heat insulation on the foot boxes (top only).

davids2toys · #9 (**permalink**) 04-26-2015, 09:22 PM

Quote:

Originally Posted by Grubby

I just received a pair of ERA inner fender vents for exhaust cooling. They look a bit different then some I have seen.

I thought the newest cars used a vent that was triangular shaped. The parts I got are right angle shaped.

Are these correct for #755? I want to be sure before I cut the inner venders.

Thanks.
John

I have car #698 and picked these up from ERA last year and still have not installed them. They look exactly like yours!
I have a question, right now my foot-wells are nice and cool, even in the summer. I was told today at a car show by another ERA owner that when I cut the hole and install the vent, that now all the hot air off the header will be directed at the foot-wells and my feet will be much hotter. Is there any truth to this?
Thanks...Dave

1795 · #10 (**permalink**) 04-27-2015, 02:33 AM

Dave,

I have the vents in ERA 717, they have been there all along, and there has never been a situation that I thought my feet were getting too hot. I have taken several drives of between 250-450 miles and never felt overheated, even in temps in the 90's.

Jim

DanEC · #11 (**permalink**) 04-27-2015, 01:22 PM

I don't have the vents on my ERA but I would believe they lower the temperatures on the foot boxes just by mixing, cooler, outside air with radiant heat off the pipes.

A question I have, and the reason I haven't installed the vents, is how much dirt, dust and road debris do they channel into the engine compartment from the wheel well?

1985 CCX · #12 (**permalink**) 04-27-2015, 02:25 PM

On my old CCX the boxes heated up versus without them. Spoke to Dave about this...

Heat passed over footbox and transferred the heat, keep in mind my boxes were not covered or insulated....

davids2toys · #13 (**permalink**) 04-27-2015, 02:40 PM

Thanks Jim, appreciate it

Dan, I would think quite a bit. Just look at the back of your wheel-well, that should give you an idea. I never thought about that aspect of it...hmmm

I also have a couple of more issues:

1) I have the heat shields and the aluminum panel option in the engine bay. Locations of the big hole and flange will definitely interfere with the heat shields. I will also be cutting thru FG and aluminum at the same time. Not sure of how much of a problem that will be.

2) My left from wheel is hitting/rubbing o n the inner fender well when making lefty turns. You can't hear it but you sure can see it. It is just about thru the FG. In searching the forum, I am not the only one with this problem I also believe it came up in a conversation with Doug a long time ago. I think he thought it was kind of normal. I have the same problem on the Pass side only to a much much lesser degree! That side I could definitely live with.
So, if I do the screen, then the tire will be hitting the screen. As cool as the vents look, I am not sure it is going to be worth the effort

DanEC · #14 (**permalink**) 04-27-2015, 04:47 PM

Against ERA's recommendations, I'm running 27 inch tall 70 series tires on my front and when first set up my left one rubbed a little on the bottom of the lip where it is rolled under. I ground a little on the lip to angle the inside edge back a little and just barely cleared. But by the time I set the suspension height and aligned the front, I ended up with good clearance. It's not noticeable.

Is this the same place yours is rubbing - at the lower roll under for the rocker panel? Can you just grind the edge of the lip back slightly, contour it and touch up the edge with some paint? I think the body update came between our cars so mine may be slightly different in that area.

Here was the bottom of my fender lip showing the contact before I did some grinding.

Grubby · #15 (**permalink**) 04-28-2015, 06:49 PM

Quote:

Originally Posted by davids2toys

I have car #698 and picked these up from ERA last year and still have not installed them. They look exactly like yours!
I have a question, right now my foot-wells are nice and cool, even in the summer. I was told today at a car show by another ERA owner that when I cut the hole and install the vent, that now all the hot air off the header will be directed at the foot-wells and my feet will be much hotter. Is there any truth to this?
Thanks...Dave

Dave = I saw no difference in foot box temp with or without the vents. The car was routinely taken on very long runs.

John

davids2toys · #16 (**permalink**) 04-29-2015, 06:57 PM

Thanks John, appreciate it.

Dan, I have no idea what I am running for castor at all. The car sits really nice and goes down the road great. Tires are wearing perfect too.
Maybe I'm nuts, but the wheel well appears smaller in width on the drivers side.
Probably will be calling ERA soon.

DanEC · #17 (**permalink**) 04-29-2015, 09:24 PM

Quote:

Originally Posted by davids2toys

Thanks John, appreciate it.

Dan, I have no idea what I am running for castor at all. The car sits really nice and goes down the road great. Tires are wearing perfect too.
Maybe I'm nuts, but the wheel well appears smaller in width on the drivers side.
Probably will be calling ERA soon.

Caster mostly just shows up in steering effort at low speed and self centering of the wheels in straight ahead driving. It doesn't affect tire wear or appearance to any significant degree that I'm aware of. But increased caster does slightly shift the wheel location to the rear which would increase the interference with the wheel well. Might be something to check out and see where it currently is set at.

davids2toys · #18 (**permalink**) 04-30-2015, 08:02 AM

Quote:

Originally Posted by DanEC

Caster mostly just shows up in steering effort at low speed and self centering of the wheels in straight ahead driving. It doesn't affect tire wear or appearance to any significant degree that I'm aware of. But increased caster does slightly shift the wheel location to the rear which would increase the interference with the wheel well. Might be something to check out and see where it currently is set at.

I did not think castor or camber would shift the tire to the rear. I just Googled it, hmmmm, you might be right.
I should do some measuring on both sides of the car center to center to the rear wheel.
Probably more accurate with the wheels off the car.
Related question: I need to bleed all the hydraulics, do I need to remove the rear wheels to bleed the INBOARD brakes. This may be a good time to do the measuring.

sea2jet · #19 (**permalink**) 05-03-2015, 06:16 AM

I was going to install the vents but decided against it after speaking with Doug. My car has the heat shields installed and thought the vents looked cool, but Doug said if you ever get caught out in the rain, it makes a mess in there with the screens installed.

davids2toys · #20 (**permalink**) 05-03-2015, 07:04 PM

Quote:

Originally Posted by sea2jet

I was going to install the vents but decided against it after speaking with Doug. My car has the heat shields installed and thought the vents looked cool, but Doug said if you ever get caught out in the rain, it makes a mess in there with the screens installed.

Doug told me the exact same thing!