Google removing hood insulation (or liner) and you'll see people who claim to be engineers and hybrid hyper milers say it's for sound deadening only and only traps heat...

I suppose if you live in a cold weather area it may help a little, but even at the same time, you can have an electric engine heated which negates the need for insulation...Furthermore, I'm in a very warm state...So other than aesthetics and sound deadening is there any reason to keep it on? I have the "hot air" pulley and am trying to minimize heat anyways...

 

I can't think of any other reason to keep it than what you stated. Don't know if it really would help to cool things to any noticable degree though.

 

it should give a little more room for air to circulate and heat transfer through the hood maybe

 

No surprise it's for sound deadening, never thought it would be anything else, I'm running an upgrade pulley and use an OBD reader for continuous monitoring, you would be amazed to see how hot the intake temp gets at idle, but it rapidly drops to ambient once moving, I can't see removing that liner making a worthwhile difference.

 

The blanket is for sound deadening as stated above, but removing it to 'cool the engine' is counterproductive when attempting to increase mileage. The hotter the engine, the better.

Cold air= increased HP
Hot engine= increased HP
Cold Air+Hot engine= greatly increased (optimised) HP

Cold engines 'waste' heat energy by transferring it into the atmosphere via the cooling systems rather than pushing the pistons.

 

At first, I didn't really care much for it. But when I went in to have my hoodliner replaced under warranty after it came off, the technician at the Jag dealer told me it was necessary to replace it in order to protect the paint on the hood.

 

That is what I would think as well.

 

I heard the exact opposite as the outside of the hood will always be cooler than the under (after warm-up)...Heat being the finish killer, not coldness...So the question is...If you have a 3lb pulley running WOT on a highway on a 100f day, which is lesser of two evils?

Thermodynamic engineers/race gurus and hyper milers seem to go against what Jag dealers say...

 

Hood blankets were unheard of back in the when cars were cars, men were men and sheep were scared. They appeared in the late 60s/early 70s to comply with noise regulations, primarily in the US. A look at Corvettes of the era will bear this out.

 

I wouldnt take it off, on some cars it helps keep the washer lines routed in place. If you take it off car buyers mite start thinking bad thoughts, plus the paint job under mite not be so perfect. You wont see any performance + or - with it off.

 

Good points...Performance isn't my goal, longevity is, even though I can't imagine this having any major impact...

 

If longevity was your goal, you should have gone with nitrous (sorry, couldn't help myself).

 

Mine is off, allows cool air over the intake pipe and oil coolers and the temps on these are lower to the touch than with it and under hood temps are lower, plus i love the extra intake/charger noise i can hear sports mode sounds great. Easy to take of and refit and does not interfere with washer tubes. Sounds like it is going harder, whether it really is who knows, who cares, live for the noise... ... I am going to look at bonnet venting as well...

 

I have thought about the xkr vents myself.

 

<wipes a tear from my eye> All my nitrous propaganda has finally rubbed off on you guys...

 

I'd love to see some actual numbers if you can.

 

Deal on a HDE Thermometer
http://www.amazon.com/dp/B002YE3FS4/...m&linkCode=as1


After looking at my liner, my liner seems to be in danger of falling off anyways...Terrific...

 

You can try an old rallycar trick instead. It was used, and may still be used, in classes where body modifications were not permitted. But, badly fitting panels were of no concern

If you have a rubber gasket at the scuttle to hood interface, remove it to let air flow out. You might even raise the hood just a bit with several thick fender washers if the hinge is at the back. Letting the air flow out cools the engine bay and creates downforce. Or at least lessens up force from the bernoulli effect.

 

Sounds like folks are just venting ...

 

LOL! Hilarious Bob. I like this thread. It's uplifting.