Quote:
Originally Posted by 93Cobra#2771
The underhood insulation is there for a sound deterrent. Any heat retention is incidental. If it was important to keep it warm under the hood, they would seal it up just like the passenger compartment. Rubber seam sealed and all.
A much better way to retain heat would be to pop the hood and put said blanket on top of the motor, avoiding any hot exhaust parts of course (don't want to burn the car down).
To answer the OP question - waste of time to try to add additional hood insulation.
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Quote:
Originally Posted by Christ
Cobra - When you say that heat retention is not necessary, you fail to logically understand the concern of the OP.
His concern was the if you warm the engine, it's more efficient than a cold one. Thus, keeping the underhood area warm will obviously keep the engine warmer, and it will run more efficiently from the first minute of the next start. He's not talking about retaining heat for hours, or days, but minutes. maybe an hour.
by the way, if you have read anything on this forum about efficiency, you would know already that heat retention is key in making an engine more efficient.. this "the OEM didn't do it, so it won't work" mentality is BS. It shows a considerable lack of evaluation skills. If that was the mentality of the rest of the world, we would not have most of the things that we have.
Please think twice before poisoning the board with this type of information.
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Perhaps if you had read my post a little more carefully, you would have noticed I was referring to hood insulation ON THE HOOD itself. My point was with all the gaps and places for the heat to make it's way out, it wouldn't be an effective way of keeping heat in the motor. Perhaps, when I said "If it was important to keep it warm under the hood, they would seal it up just like the passenger compartment. Rubber seam sealed and all." I should have said "If it was important to keep it warm under the hood, they would seal it up just like the passenger compartment. Rubber seam sealed and all.
But there is a better way to keep the engine warm.". In fact, I'll give you that point, as I typed my original post on a phone, which can make it a little difficult to keep track of what you type and don't type.
I NEVER in any part of my post said that heat retention was not necessary. I quoted my original post just so you wouldn't have to scroll back and look.
Then I gave the option of insulating the top of the motor itself with some type of blanket placed on it, which would be MUCH MORE effective at keeping heat in the motor.
The engine blanket that silverinsight2 showed in his thread is exactly what I was talking about.
Please think twice before accusing people of "poisoning this board" and actually read and evaluate someone's post before spouting off on a diatribe and lecturing everyone on how they should and should not participate in threads. That's the whole point of a forum, to get feedback from people with multiple backgrounds and ideas about different things and ways they might or might not work better.
By the way, there is a much better alternative to Dynamat, at a fraction of the cost. It is called "Peel and Seal" and is located at Lowes and Home Depot in the roofing section. It is a super adhesive product, about 1/4" thick, used to seal gaps in roofing. It has a reflective aluminum laminated to one side and is identical to Dynamat (I have used both). I insulated the entire roof and floor in my escort, primarily for sound deadening purposes. An added bonus is it keeps it from getting near as hot inside in the summertime while baking in a parking lot. And it is MUCH less expensive than dynamat.
Peel & Seal at Lowe's: 6"x25' Roll Self-Stick Aluminum Faced