Pics from the Edgewater(NJ) GTG...
08-06-2004, 04:27 AM
#16
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Don't think it does much. The heat transfer from the head to the coil packs is
not going to be affected by a heat shield. That simply adds a barrier for radiant heat transfer from the generally hot underhood area. I wouldn't doubt it if that thing bottled more heat in than it kept out, although it may have some heatsink affect on the head. The block and heqd are going to reach a steady state temp of something close to the ~200 Deg. of the coolant and oil. The air under the hood deoadn't get that hot, except right next to the exhaust manifold and turbo, and again that's simply radiant heat.
08-06-2004, 04:41 AM
#17
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Then why would audi put a cover over the valve cover in the first place?
You say the block and head will get to 200 deg, but yet the manifold will reach temps of 1600 degs inside and if you dont think that heat shield is going to help try putting your face next to the manifold after running the car hard for 20 minutes.
08-06-2004, 04:55 AM
#18
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The stock cover is ornamental, nothing else. And yes, I say the underhood air temp is less than the
temp of the block and head. Air does not retain heat and is flowing under the hood anyway. While the exhasut mani. and turbo do get extremely hot, the radiant heat more than a few inches away from them is not that great, you can put your hand there. Can you put your hand in air heated to above 200 deg? (Hint: water boils at 212 and air at a similar temp will burn you almost as badly.) In addition, the coilpacks are on top of the head, while the turbo and manifold are on the sides, even with a big turbo repositioned upward. So yes, the coil pack heat shield is worthless.
