30 degrees + - some unknown amount in the head.........
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| Valve Angle - NOT seat angle https://slantsix.org/forum/viewtopic.php?t=58666 |
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| Author: | the_engineers [ Fri Nov 06, 2015 5:54 pm ] |
| Post subject: | Valve Angle - NOT seat angle |
Does anyone know what the valve angle (off vertical) is for the /6? For example, 340 is 18* and SBC is 23*... |
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| Author: | emsvitil [ Fri Nov 06, 2015 6:07 pm ] |
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30 degrees + - some unknown amount in the head.........
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| Author: | Dart270 [ Sat Nov 07, 2015 4:05 am ] |
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He means off the axis of the cylinder. I think I heard it is the same as LA engines (18 deg), but I don't really know. I am interested too! Lou |
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| Author: | Badvert65 [ Sat Nov 07, 2015 6:55 am ] |
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I measured about 13 +/- a degree or so on the drawing in the Mopar Engines manual. |
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| Author: | ProCycle [ Sat Nov 07, 2015 7:43 am ] |
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I measured the angle on a head a while back but ended up not doing whatever it was I wanted the angle for. The number that sticks in my mind is 11 degrees. |
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| Author: | ProCycle [ Sat Nov 07, 2015 8:57 am ] |
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OK, I got curious so went out to the shop where I happen to have a bare head getting ready take to the machine shop. With an old intake valve and my 'anglelometer' I measured 11.5 degrees. 
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| Author: | Dart270 [ Sat Nov 07, 2015 1:05 pm ] |
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Good to know, guys. I thought about measuring one on the bench, but y'all beat me to it. 11.5 deg might explain why you can make a good flowing head (relative to the cyl displacement), even with the 30 deg angle between the intake surface and the cyl axis. Need to think further about this... Cheers, Lou |
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| Author: | sandy in BC [ Sat Nov 07, 2015 2:00 pm ] |
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Just dedicate 30 billion neurons to 3D mapping....you will figure it out. |
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| Author: | the_engineers [ Sat Nov 07, 2015 3:03 pm ] |
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Thanks everybody! |
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| Author: | Doctor Dodge [ Sun Nov 08, 2015 9:12 am ] |
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The factory blueprints spec the valve guide angle at 12 degrees. Early SL6 engine development engineering documents say that 14 degrees was also tried & tested but 12 degrees worked "better" for the engine's intended use. DD 
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| Author: | Dart270 [ Sun Nov 08, 2015 9:27 am ] |
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I was hoping you would chime in, Doug - thanks! 12 deg it is... Lou |
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