hpV12

Reason one most of us don't care too much about and reason two is rubbish, your hood gets more damage from summer heat when the suns cooking your hood then when you are driving around with no liner. There are absolutely ZERO negative side affects from removing the liner+plastic guard.

If we look at Manuyc's picture we can see the hood is "layered" in a way. The first area directly over the engine bay is the one that first feels the heat, and as the car is moving the heat gets pushed out through the vent and leaves the top part of the hood nearly unscathed.

E55Greasemonkey

Exactly.....I removed my insulation and plastic shield a few weeks ago in the Florida summer heat, and with headers!! I took some measurements before/after with an infrared thermometer. Before, my engine compartment was cooking, everything was 150-160F under there, including the surge tanks. When opening the hood after a drive, a wall of extreme heat would blast you in the face. After, The temps dropped from 10-20F. The surge tanks now run from 120-140. Removing these 2 things allows hot air to escape the engine compartment now. It cooled things off underhood anywhere from 10 to 20 degrees!! And after a few hard runs before, you could feel the car heat soaking. Not any more. The hood itself gets to a max 145F, with headers, vs. a black e320, a Hyundai, and a Jeep, which I checked and the hoods hit 160F just parked in the sun. As a note, all the E Class models, diesel, V6, etc, have this same exact hood and lining. It's there for noise, and probably to help the engine heat up faster and stay hot in cold temps. I have been through many hard rainstorms without an issue, just a few drops of water sitting on the Y-pipe intake tube, and have a nice blower sound inside the cabin.

Manuyc

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alextaylor29

So as I live in AZ this will help me presumably? Still not sure to be honest, the MB engineers put this there for a reason I'm assuming? The heat here is brutal so I'm assuming this would help.

Does anyone (and please be honest) have any regrets of removing this from the hood?

AMG E Power

Any benefit to just removing the guard to open up the vents and leaving the hood liner on.

hpV12

I only took off the guard first. You get to see the heat escape and it helps a bit I'm sure, but the real change was after removing the hood liner itself. You can hear the blower whine real loud now. If anyone's doing this, it should be all or none-- carpet is easy to reinstall anyways.

pearlpower

I'm in the desert, no issues at all. Even when it pours.

alextaylor29

OK then it's all coming off today! I mean 20F reduction in engine temp is significant so why not do this? Many of the newer preformance cars, Shelby 500GT have this built into the hood (heat extractor) so the logic behind this is sound!

Plus hearing the blower a bit better will be awesome.

Thanks guys, this is why I love this forum, very helpful/useful/sound advice!

Alex

berti_00

doooooo it man do it lol... i took mine off last night... its a no brainer really, after driving for a while just put your hand over the vents and see how much heat is coming out, your going to be like

cij911

If you say so....Which automotive company do you run, own, or work for ? Do you have a degree in Mechanical Engineering or do you simply like to repost with authority what others have said ? The liner is on the hood for two purposes - (1) noise (yes you don't care about that) and (2) protection from heat. Sure if you left your car in the desert in the summer, your hood might read more than 160 from the radiant heat, but the radiant heat hitting the underside of the hood when driving is far greater than 160*. Attach a thermocouple to the hood or hood liner and drive around for an a bit in the summer .

Either way, folks will do it and few will likely see any negative ramifications because they will sell their cars long before the paint begins to fade.

Manuyc

[KQUOTE=alextaylor29;5358969]OK then it's all coming off today! I mean 20F reduction in engine temp is significant so why not do this? Many of the newer preformance cars, Shelby 500GT have this built into the hood (heat extractor) so the logic behind this is sound!

Plus hearing the blower a bit better will be awesome.

Thanks guys, this is why I love this forum, very helpful/useful/sound advice!

Alex[/QUOTE]

alextaylor29

OK peeps, this is done! Remove both the underhood liner and the plastic thingie that blocks the vent. (Or whatever it's called) Below are some pic, and sorry my car is so dirty, washed it directly afterwards.

Quick review, no water got in the engine bay as I washed it after I removed everything just to see what happened. And nothing...no water got into the engine bay. If you turn the radio off and the fan/AC off you can hear more of the Supercharger and some "Whooshing" of what I assume to be the throttle body. In no way is this intrusive loud though and you can only hear it when you're giving her the, "Boot." However with radio on just a bit and the AC blowing a little, and the widows up, you can't really hear anything different inside the cabin. Under normal driving you won't hear anything different for those if you that are concerned about this.

Heat definitely escapes out of the vent now. It's 96F here in AZ today and after I parked, I put my hand directly over the vent and had to pull it back pretty quick as the heat was rushing out, which is good!

So in short, I can't find any downside to this mod and remember, you can always put it back (I saved mine) if you want for some reason. Great mod, keeps our car cooler and no downside, particularly since our motors suffer from heat soak. If you look at most Supercharged cars or newer performance cars, Z06, GT500, Viper, etc...they all have hoods that vent away heat so this mod is inline with what most high HP cars are doing now anyway.

And again for sound, it's just a tick louder and that's only if you're listening for it with the radio off, windows down and the fan off.

Get 'er done!



Do this mod!

AKnight55

Why would I car about the paint under my hood anyway

cij911

Alex, would you please post your IATs before and after ?

I believe the car would definitely vent from the grill when you are at a stop light, just not sure about under speed, but probably so...

Ak - I was referring to the paint on the top of the hood being damagde due to the radiant heat. Seems like most don't care about the increased noise, so I guess for many this is fine.

novae500

Going to d this free heat mod tomorrow. I guess during the winter it will take the engine longer to warm up

alextaylor29

If you guys want I can do a quick video from within the car so you car hear the sound difference? Only if this helps, as I'm tierd of seeing myself on YouTube now.

Let me know OK?

Alex

Manuyc

I was going to do the same. It sounds so dam awesome especially when the sc whistles

SilverStrk

Going to do this removal this week, here in S.D it was 100+ degrees today and I had to drive 200 + miles. I have already removed the liner, (no issues at all), now the the cowl guard is coming off.. Only reason I did not do this was beacause of potential water issues.. 20 + degree drop and more whine

Pull it and if water becomes an issue, put it back on..

berti_00

just do it guys it literly takes 5 minutes to remove all that crap and you wont regret a thing... just for results drive a little and than put your hand over the vents there is massive amounts of heat escaping your engine bay, so whats not to like about that

cij911

20+ degree drop in IAT ??? Please post data ....Sorry guys that I am so skeptical on the rain gutter mod, but it is in a high pressure area and should not really help at speed. If you wanted to help better vent the engine bay, I guess you could do what many hot rodders have been doing for year and vent the hood in a low pressure area.

Yes you will see air coming out of the vent when the car is not moving. If you want to test at speed, just tape some string to the inside of the grill and watch what it does at speed.

alextaylor29

Manuyc

Cant wait for a Bigger TB to enhance the Sound of the SC.

berti_00

Somebody is going all out lol

novae500

removed the plastic piece while doing oil change this morning. Pretty simple and easy to remove the 4 screws and pushing the tabs to get them to unlock from the vent

hpV12

I'm speaking from experience, you speculate. Unless you've done this yourself and sampled before and after temps with liner and guard removed? In which case, could you answer for us if the temps dropped or increased in the engine bay once removing the vent guard and hood liner?