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Originally Posted by cheapybob
I'm leaning towards some sort of setup that uses a bimetallic from a thermostat to trigger a vacum valve that controls a butterfly opening in a second intake tube letting in cold air, and having a second way to open it off the cam that the throttle cable uses to allow it to also open anytime I push the accelerator down hard.
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Just get an airbox out of a 4-cyl naturally apsirated Volvo from the mid 80s-early 90s. That airbox (at least the one in my 740) breathes from two intake paths (one to fresh air, one to the exhaust manifold) and is thermostatically controlled via a very simple flapper valve setup. You may need to replace the thermostat itself, but they are cheap from the right source. The only problem is that I don't know what the target temperature is.
ZugyNA 
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