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| Engine gets hot and runs really bad https://www.slantsix.org/forum/viewtopic.php?t=62925 |
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| Author: | Nearo123 [ Mon Oct 15, 2018 2:41 am ] |
| Post subject: | Engine gets hot and runs really bad |
I have a slant 6 in my 63 plymouth and it runs really good cold but as it warms up it starts to drop rpms at idle and will stall even in park at idle. When cold it idles at 1100rpms to 1300rpms in park. In drive it idles at 700rpms. Once it gets hot it will backfire out the carb whenever it's given gas. The carb on it is a rochester 2bbl. If anyone knows what the problem could be please let me know. Thanks |
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| Author: | Doctor Dodge [ Mon Oct 15, 2018 12:16 pm ] |
| Post subject: | Re: Engine gets hot and runs really bad |
Have you checked the valve lash adjustment? Tight valve lash clearance gets even tighter, as the engine gets hot. DD |
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| Author: | Nearo123 [ Mon Oct 15, 2018 3:11 pm ] |
| Post subject: | Re: Engine gets hot and runs really bad |
Have not checked. What should they be set at? |
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| Author: | bcschief [ Mon Oct 15, 2018 3:25 pm ] |
| Post subject: | Re: Engine gets hot and runs really bad |
.010 for the intake and .020 for the exhaust is the factory valve lash setting. Brian |
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| Author: | Nearo123 [ Wed Oct 17, 2018 12:05 pm ] |
| Post subject: | Re: Engine gets hot and runs really bad |
Thanks. Also i dont think the valve that controls the exaust to the intake manifold is working at all. Do you think this is part of the problem? |
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| Author: | SpaceFrank [ Mon Oct 22, 2018 9:13 pm ] |
| Post subject: | Re: Engine gets hot and runs really bad |
If the heat riser valve is diverting exhaust to the underside of the intake manifold even when the engine is hot, then yes that could be part of the problem. Just to be clear, that .010" intake and .020" exhaust lash should be set when the engine is hot. |
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