heat riser

heat riser
[1] An area, surrounding a portion of the intake manifold, through which exhaust gases can pass to heat the fuel mixture during warmup.
[2] The flapper in the exhaust manifold that is closed when the engine is cold, causing hot exhaust gases to heat the inlet manifold, thus providing better cold engine operation; a thermostatic spring opens the flapper when the engine warms up

Dictionary of automotive terms. 2015.

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