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1project2many · 05-15-2018, 06:47 AM

As the spring heats up the metal gets longer. Combined with the weight this allows the valve to open. If the manifold is hot to the touch the valve should be open although it might not be fully opened. There wasn't a bunch of spring pressure unless the engine was pretty cold. If you tried to "wind" a loose spring you would usually damage the spring and it would never work correctly again.

05-15-2018, 06:47 AM	#4
1project2many Registered User Join Date: Mar 2012 Location: Lakes Region NH Posts: 3,158	Re: Manifold Heat Valve As the spring heats up the metal gets longer. Combined with the weight this allows the valve to open. If the manifold is hot to the touch the valve should be open although it might not be fully opened. There wasn't a bunch of spring pressure unless the engine was pretty cold. If you tried to "wind" a loose spring you would usually damage the spring and it would never work correctly again. Last edited by 1project2many; 05-15-2018 at 06:57 AM.