I was thinking about a cost effective way to lower underhood temps a bit. I first thought aluminum foil cheap, but will it do the job or maybe make a negative effect. I know to keep the shiny side out to keep heat out for instance the intake tubing, and main cause of underhood temps are my headers that have no heat shield, keeping the shiny side in would keep some heat in the headers and lower underhood temps possibly. Would it be okay to put foil on headers or is that to hot? I was thinking it might have a negative effect possibly with the intake though.

Better idea - insulate your cold air intake. This will keep the air cool, from the ram on the front of the car, so the engine compartment's heat wont transfer to the intake air. This will accomplish what you want to do. Cooler air at the intake = more power.

The only way to get the underhood temps down is a cooler thermostat, anything else will be a major waste of your time, with little result. That aluminum foil is likely better off for baked potatoes and such.

I was thinking about insulating my intake a while back, but got busy doing other things!

hey speedy!..just get some high temp insulating tape. i have it on my car you've seen it. i have some if you need it. i have about 100 feet of it . its rated at about 1000-1200 degrees.

See wat i was thinking was aluminum foil first, than put that insulating tape, that way if i wanna go back to nice black intake box it'll be easy. If i put tape directly on it will probably leave silver strips all over and a sticky surface that will take forever to make clean again. Maybe both of them together will keep heat out even more?

Where did u you get that high temp insulating tape again? Im thinkin of picking up tape from home depot or something, dunno if its good to those kinda temps though.

I second that

i got it from a brickhouse in brampton...it is industrial insulating tape...you cant get it at any home depot i dont think...its rated for some really high temps.

Regarding underhood temps... does a few degrees really make a hill o' beans worth of difference under normal driving conditions?

Hi speedy266, 73Delta88, Hello all,


It won't, unless the air stops flowing long enough to absorb the heat.

Regards, Norm