Quote:
Originally Posted by Stubby79
If it's just sucking under-hood air, it isn't going to get too warm. Except maybe if you're stuck idling for a while. Even if you are sucking straight off the manifold, there will be plenty of air swirling around in the engine bay, especially at highway speeds when you'll be running under load for extended periods.
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Grill block can help that quite a bit. I've had intake temps over 140F in ~40F weather at highway speeds in my Prius. That's with just a full grill block and removing the intake tube from the filter box, the bottom of the engine bay is wide open.