PhilJohnson Posted April 11, 2012 Report Share Posted April 11, 2012 I have a non-functioning heat riser. Does turning the valve clockwise shut off the flow of exhaust to the intake ? I have a vice grips on the counterweight so I can turn it on or off depending on if the engine is cold or warm. I don't want to burn my valves. Thanks Quote Link to comment Share on other sites More sharing options...
greg g Posted April 11, 2012 Report Share Posted April 11, 2012 yes Quote Link to comment Share on other sites More sharing options...
54Illinois Posted April 11, 2012 Report Share Posted April 11, 2012 How long would it take to burn out valves if it sticks? Quote Link to comment Share on other sites More sharing options...
greg g Posted April 12, 2012 Report Share Posted April 12, 2012 How would it burn valves??? When the flap is horizontal it allows exhaust gas to flow through the exhaust manifold, when it is vertical it diverts the exhaust gas from 123 cylinders to flow through a small portion of the intake manifold directly below the carburetor. It would interesting for some one with an infra red temp sensor to do a test of the temps of the exhaust and intake manifolds, with the flap in its fully horizontal and fully vertical psoitions to see what the actual temp difference is. I would venture a guess that it a pretty small difference in. Quote Link to comment Share on other sites More sharing options...
PhilJohnson Posted April 13, 2012 Author Report Share Posted April 13, 2012 Well I've decided to get rid of the whole works. The heat riser gasket is blown out and I've decided not to spend any money on something I never missed in the first place. Quote Link to comment Share on other sites More sharing options...
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