Re: Exhaust manifold Heat Riser Question

Posted by Owen_Dyneto On 2017/11/13 13:15:41

The function is that when cold, the coiled bimetallic spring provides enough tension to hold the counterweight UP and in this position the valve is closed. As the spring warms up it relaxes (uncoils) from the heat, allowing the counterweight to drop down and thus opening the valve.