How would underhood temperatures be affected w/ the OEM metal hood vs. a carbon fiber hood? I think the metal hood will act as a heat sink, conducting some of the underhood heat and radiating it outwards into the atmosphere, thus lowering underhood temperatures somewhat. I would think that a carbon fiber hood would not get as hot as a metal hood, thus trapping more of the heat under the hood and not radiating it out into the atmosphere.

I reference this thread: https://honda-tech.com/zerothread?id=560340
A custom hood insulator was made, and the OEM metal hood was reported to stay much cooler (for the purposes of reducing the chance of paint fading) but the underhood temps got hotter.

So what do you all think, would underhood temps be lower w/ a metal hood, a CF hood, or would there be no change?

 

Okay there was supposed to be a 3rd choice of "no change" but the stupid thing wouldn't let me finish

*7000th post*

 

what about the CFH with the aluminum base, i thought most them were like that. well at least the majority the shops i know where trying to sell them for the same ol price.

 

metal conducts heat, carbon fiber dissipates heat... much cooler wit cf hood

 

How much cooler is the Engine bat temp with a CF hood versus a Stock hood ?

 

I vote lower withthe Heat Sink, err - I mean Metal hood.

That was my hood heat shield btw. Worked too damn well.


Just a side note:
I have seen a site where a VERY industrious RX-7 owner fabbed a vent and heat shield for the underside of his Fiberglass hood. He did an awesome job. He was concerned about the effects of heat on his fiberglass. i don't think nfiberglass is as imprgnable as CF though. It depends on the resin used I suppose.

 

It's really hard to say, on a bright sunny hot day I would think the cf would create hotter under-hood temps but then again the metal itself will hold more heat thus creating a hotter underhood temp. It all depends on the conditions I guess.

 

well since the metal is a conductor it should get hotter and absorb/dissapate more heat...

where cf is an insulator and will probably keep more heat in.....unless you get the vented type

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HybridGSR1 &raquo;</TD></TR><TR><TD CLASS="quote">metal conducts heat, carbon fiber dissipates heat... much cooler wit cf hood</TD></TR></TABLE>

can't dissapate heat unless you absorb it first......
only way to dissapate heat faster is to have more surface area ( like putting some fins on it...like a heatsink) or by having more cooling....like a fan pushing air on the surface....or by driving faster ( more air turbulance)

the heat isn't going to just magically go thru the cf hood....

metal is by far a better conductor of heat....and since its such a good conductor....it absorbs it readily.....and is then dissapated quickly on the outside surface of the hood when it the car is in motion