well its rather nasty looking..my car is drivin year round so there is salt spray...positive feedback would be nice
yes. there are downsides to removing it. like blistering, cracking, and fading paint. Aluminum (what the hood is made of) transfers heat really, really well. so it would pick up all that nice heat rising off the motor/turbo and throughly bake your paint worse than the california sun.
i realize the hood is aluminum..which would lead me to believe it would shed heat faster than a steel one...if the heat hasn't blistered the paint in the engine bay , i would think the paint would be fine..i was under the impression it was more of a fire blanket..plastic tabs melt, it falls, smothering the fire..and i also thought it might be for sound dampening.
The paint in the engine bay is not directly OVER the engine like the hood is. Yes, an AL hood would shed heat qucker, but it will MAINTAIN the temperature it's subjected to. so once the underhood temps begin to fall, so will the hood temp. the idea of the blanket is to reduce the amount of heat the hood is actually exposed to. It does also function as sound deading, as for it's functionality as a fire blanket, i'm not sure... i'll let brian chime in on that one. but i can garuntee that's not it's only functionality.
I've never heard of it being used as a fire blanket before, in my experience they burn just fine. I'd keep it in there so it doesn't bake your paint like Shane mentioned. Never hurts to have another layer between your engine and your hood.
You could always take out the tatty looking matting, and spray glue a bunch of those silver emergency blankets to the underside instead. It should only take two or three if you position them right. This would reflect the heat back, solving Shane's problem, save weight, and act as a bit of underhood bling. And, as a bonus, Target has them on sale right now for $1 each. I already picked up four to put into our Winter Emergency Kits. Yeah, it may sound a bit of a daft idea, but it worked on the McLaren F1. Although they used gold sheets. Stuart.
Mine is removing it self by the heat from the turbo... and the vents and all the air, dirt and water transferred through it...
translation = STUPID.... ha ha ha Stuart this cracks me up another word I never expected to hear int he US!!
no its just ugly, thats why i took it off. also maybe letting heat out through the hood is a GOOD thing....
but it isnt really letting heat out... it transfer heat to... out would imply there is an opening large enough to allow it out... I am on the fence as far as adverse effects.. my opion is they put it there for a reason from factory... make sure it isnt a safety thing..?!?!?! dont see it being one... hey if you want to take it off take it off.. kinda like cats etc.. they are on there from factory but do we leave them on
you know what i meant jackarse...and actually you ARE letting more heat out since the padding isnt there to block it.
actually no I dont... and I am still wondering how heat goes through the hood.. through being operative word.. through as in LETTING IT OUT... not just HEAT SOAK...
Thermal conduction..... Heat moves from hot (high energy state) to cold (low energy state). Removal of the insulation results in higher hood temps, therefore there is more tendency for heat to move to a cooler area (bigger gradient). In the end there is more heat removed from the engine bay to the surrounding body and the air. I still wouldn't do it....
thanks... see that's an explanation that warrants listening too... but still doesnt quite explain the letting heat out.. which in itself proclaims total escapage of heat from engine bay area THROUGH hood... maybe on Wagners wagon with all those vents.. but not THROUGH solid aluminim surface,,, anyways... so I am guessing your car is a SHOW car huh.. cause all those people who see the underside of the hood while you are driving around.... hate people to see an ugly car engine bay on 494 or anything.. he he
I think the part you're missing is the idea of letting 'heat' out versus letting 'hot air' out. Yes, to let 'hot air' escape you'd need a bonnet like Wagners. To let 'heat' escape you just need a colder body for the thermal energy to transfer to. If the underside of the bonnet is colder then the air trapped there, the heat will transfer to the metal. If the top of the bonnet is colder than the bottom, the heat will move up through the metal. If the air above is colder than the top of the bonnet, the heat will move into the air. Isn't this how radiators and intercoolers work ? I wouldn't've thought this was such a difficult concept to grasp. Stuart.
wow, cant read through that at all. ever thought that sometimes its pointless to take the time explaining things to you because most of the time you're just a jackarse about it either way??
so I am guessing your car is a SHOW car huh.. cause all those people who see the underside of the hood while you are driving around.... hate people to see an ugly car engine bay on 494 or anything.. he he[/QUOTE] no, my car is no more of a show car than it was when it came off the showroom floor..is it a crime to like a clean looking engine bay..all i was asking for was negative effects not, negative attitude...thanks anyway
so whos being a jackass now... you've called me that twice in the same thread when I havent said anything but sincerely question yours and soem others, ideas... and there is a difference between being a jackass and having fun... unfortunately the difference between you and me I aint out to impress people and look good.. I am me... I am a smart arse, I kid around, stir people a little, but also do my best to help out with issues whether on here or in my shop... so whatever... take another drink and drive
:laugh: :laugh: :laugh: :laugh: :laugh: now thats awesome:laugh: :laugh: :laugh: :laugh: lets see... Wife, business, 3 kids.... :laugh: :laugh: :laugh: :laugh: :laugh: yep... one of these days I will grow up and become a man like yourself..... oh wait that happened when I was 15.... . . . . .. . . . . . . . . . . . . .. oh one more thing..... :laugh: :laugh: :laugh: :laugh: :laugh: :laugh: back to original poster.... Do what you want to do... if it dont peel the paint then what ya gotta worry about!!!!
wah wah wah..... I thought we agreed to leave this stuff alone but you wanna call me jackass.... and now you are pointing fingers at me... again.. what is your point??? end of this pointlessness!!! You have opinions, I have opinions.... thats fine... lets not get personal or start down the road again... I apologise for the drinking and driving jab... I should not have gone there....
and yes i do have an extinguisher...all the info is appreciated..i did do a bit more studying on subject, and(this is info off the net so take it with a grain of salt) it is for fire prevention. that is not info from suby but just off of general car forums.
I did that on a '91 Acclaim and it cracked the paint. Did it on my Honda and it was fine. Didn't do it on my STi though as I thought about the heat and instead I had my piping wrapped and took off the weather stripping on the hood. The engine won't stay as clean but it will allow more air to pass through. For those who don't believe it, yes it actually does work. I know because you can actually see it coming out when idling along in traffic.
^^^^ But once you get moving it sucks in cold air. At that point in time, all you are doing is decreasing the air that moves through the engine bay. Put in a REAL water temp gauge, and you tell me if it works. Russ
its most def NOT gonna blister your paint, show me a hood that its happened to and then i'll believe it.
wait i'm confused...it decreases airflow into the engine bay if you take off your weather stripping? isnt cool air coming into the engine a good thing?
there are some people in this thread that understand heat transfer and fluid flow and there are some that do not.
You need to get the hot air out. You need to move air though the radiator. If you have air entering the underhood area front 2 different places, you will stall the moving air. Basically you have a high pressure area at the base of the windshield. that is why all the old muscle cars had COWL INDUCTION hoods. The scoop was sealed to the carb, and it was like having ram air. When you pull the seal out, you are allowing the high pressure to get under the hood from 2 different area's, and the fast you go, the worse it gets. At the same point it time, it will slow down the air going through the radiator. if you have a real water temp gauge, you will see that the stock wrx rad is worthless (unless cruising at 200+ degree water temp is ok). Russ
I'm doubting the impact will be that great as you make it seem. A cowl induction hood is raised much higher than a stock Subie hood. Don't forget that the Subie hood also has a scoop on it. Now take your scoop and put it on backwards (I know it won't fit but humor me) and then you'd be looking at true cowl induction. I can't imagine that not having the weather stripping in the rear creates so much less pressure under the hood that it negates the air flow from the hood scoop while moving.
Like I said before, install a good water temp gauge and try it. I noticed about a 15-20 degree rise in water temps. Russ
Wow. That's pretty significant for such a small thing. I just couldn't imagine it making that much of a difference. Does that mean those little radiator shrouds actually work?
Again, the stock radiator kinda sucks. My water temp never dropped below 200 on the drive home today. I have the seal in place, but once the air temps get up in the 90 area, the water temps skyrocket. Water wetter is worthless once the motor gets hot. I have my rad sealed to my ac condensor and the ac is sealed to the core support. I even noticed a change in water temps when you pull the lower shroud off (bellypan). I think when the rad is so boarderline to being to small, all the little things add up. Russ
