Most engine builders like to keep valve size within a certain percentage, along with intake/exhaust flow. The number we shot for at the race car shop was 75% IIRC. A motor with too much exhaust flow gives up some power.
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| Bigger valve https://www.slantsix.org/forum/viewtopic.php?t=25036 |
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| Author: | icaneat50eggs [ Fri Sep 21, 2007 9:43 pm ] |
| Post subject: | Bigger valve |
I was wondering if there would be any advantage to installing a larger exhaust valve, leaving the intake the same size. My brother inlaw and I were shooting the bull about bigger valves and he mentioned he was going to try this on a non mopar engine. I was curious. |
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| Author: | AndyZ [ Sat Sep 22, 2007 1:24 am ] |
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The slants head was designed for the 170cid. They never updated it for the 225 or 198. A normally aspirated slant would benefit from both valves being enlarged. A turbo motor would probably do better with a larger exhaust/intake size ratio. |
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| Author: | slantzilla [ Sat Sep 22, 2007 1:02 pm ] |
| Post subject: | |
Most engine builders like to keep valve size within a certain percentage, along with intake/exhaust flow. The number we shot for at the race car shop was 75% IIRC. A motor with too much exhaust flow gives up some power.
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| Author: | Dart270 [ Sat Sep 22, 2007 5:27 pm ] |
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Slant is already exhaust favored, so bigger intake and stock exh would probably be better. Lou |
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| Author: | icaneat50eggs [ Sat Sep 22, 2007 7:06 pm ] |
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Thanks, guys. |
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