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You might like to consider the amount of heat being rejected in the exhaust. At idle, 1.0l/hr might be typical. Using ~0.75kg/l and 43MJ/kg the rate of heat energy release is about 9kW. About a third of that goes out the exhaust. The exhaust manifold heats up pretty fast.
A duct off an exhaust heat shield and a butterfly valve - look for one on the air cleaner on an old car with a carburettor - should work if you want to heat the intake air.
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