Differences
This shows you the differences between two versions of the page.
| Both sides previous revision Previous revision | Last revision Both sides next revision | ||
|
techtalk:evo:carb04 [2021/05/13 10:28] ixl2relax [Exhaust Pipes & Cams - Power or Reversion] |
techtalk:evo:carb04 [2021/05/13 10:33] ixl2relax [Exhaust Pipes & Cams - Power or Reversion] |
||
|---|---|---|---|
| Line 60: | Line 60: | ||
| This complex combination of frequencies causes each exhaust system design to have it's own characteristics of helping the combustion cycle at certain rpms (making more power) and hindering that cycle operation at other rpms (creating reversion and less power). The trick is to match the right exhaust system and cams so they are working together to efficienctly create the most power. | This complex combination of frequencies causes each exhaust system design to have it's own characteristics of helping the combustion cycle at certain rpms (making more power) and hindering that cycle operation at other rpms (creating reversion and less power). The trick is to match the right exhaust system and cams so they are working together to efficienctly create the most power. | ||
| - | In the following quotations, of an XLForum discussion about stock 'D' cams versus Andrews 'N4' cams, Aaron Wilson provides a very good explanation: | + | Back Pressure is NOT a good thing. But it may come along with other efforts to make a good exhaust. |
| **Quoting Aaron Wilson from the XLForum (aswracing):**((http://xlforum.net/vbportal/forums/showthread.php?t=1028905 - Post#81)) | **Quoting Aaron Wilson from the XLForum (aswracing):**((http://xlforum.net/vbportal/forums/showthread.php?t=1028905 - Post#81)) | ||
| - | Reversion is caused by positive pressure from the exhaust during overlap. How is it exactly that "back-pressure" cuts down or prevents reversion? | + | Reversion is caused by positive pressure from the exhaust during overlap. How is it exactly that "back-pressure" cuts down or prevents reversion? (Note: It doesn't.) |
| Nobody attempting to find some virtue in "back-pressure" has yet to explain how it would be advantageous to a four-cycle motor to have the exhaust pushing back at any point in the exhaust cycle, other than the comment about preventing draw-through. My question still stands. | Nobody attempting to find some virtue in "back-pressure" has yet to explain how it would be advantageous to a four-cycle motor to have the exhaust pushing back at any point in the exhaust cycle, other than the comment about preventing draw-through. My question still stands. | ||
| Line 99: | Line 99: | ||
| + | An XLForum discussion about stock 'D' cams versus Andrews 'N4' cams: | ||
| **Quoting Aaron Wilson from the XLForum (aswracing):**((http://xlforum.net/vbportal/forums/showthread.php?t=1028905 - Post#12)) | **Quoting Aaron Wilson from the XLForum (aswracing):**((http://xlforum.net/vbportal/forums/showthread.php?t=1028905 - Post#12)) | ||
