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| Manifold Heat Control Valve https://slantsix.org/forum/viewtopic.php?t=23397 |
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| Author: | J. Goodman [ Wed May 30, 2007 8:12 am ] |
| Post subject: | Manifold Heat Control Valve |
When the Manifold Heat Control Valve is rotated toward the driver's side of the car, is it opening the exhaust passage, or closing it? |
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| Author: | SlantSixDan [ Wed May 30, 2007 8:25 am ] |
| Post subject: | |
Standing at the front of the car looking straight at the heat riser valve, the clockwise position directs exhaust to the underside of the intake manifold (heat on), and the caounterclockwise position directs exhaust away from the underside of the intake manifold (heat off). |
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| Author: | Doc [ Wed May 30, 2007 8:26 am ] |
| Post subject: | |
Closing... really, it is "directing" the exhaust flow up towards the bottom of the intake manifold. Full "counter-clockwise" rotation directs the flow down the exhaust pipe. DD |
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| Author: | J. Goodman [ Wed May 30, 2007 8:40 am ] |
| Post subject: | Manifold Valve |
Thanks to both of you....cleared that right up. |
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| Author: | mrhite65 [ Tue Jun 12, 2007 11:56 am ] |
| Post subject: | |
When at operating temp, is the valve suppose to be in the open position or does it only open when given throttle? Mine seems to be in the closed position until you give it gas. I would think if it isn't cold it would just stay open. Is there something wrong with mine? |
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| Author: | SlantSixDan [ Tue Jun 12, 2007 1:57 pm ] |
| Post subject: | |
The valves used through '70 (w/rectangular counterweight) stay in the "heat off" position once they've warmed up. The '71-up valves (w/round counterweight) stay in the "heat on" position even once they've warmed up until an engine speed corresponding to about 30mph is reached, then they go to "heat off". Yours is working as designed. |
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