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techtalk:evo:carb04 [2021/05/13 10:33] ixl2relax [Exhaust Pipes & Cams - Power or Reversion] |
techtalk:evo:carb04 [2024/01/02 22:24] (current) hippysmack |
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| "Use the factory studs - They're the only ones out there\\ | "Use the factory studs - They're the only ones out there\\ | ||
| - | with interference fit threads on the head side. ((aswracing at http://xlforum.net/forums/showthread.php?t=2070093)) | + | with interference fit threads on the head side. ((aswracing at https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-motor-top-end/193941-installing-exhaust-head-studs?t=2070093)) |
| {{:techtalk:evo:carb:exhaust-stud-16715-83.jpg|}} | {{:techtalk:evo:carb:exhaust-stud-16715-83.jpg|}} | ||
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| There are a number of XLForum threads regarding installing the Exhaust Port Gaskets.\\ | There are a number of XLForum threads regarding installing the Exhaust Port Gaskets.\\ | ||
| - | http://xlforum.net/forums/showthread.php?t=44022\\ | + | https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-intake-and-exhaust/sportster-motorcycle-air-intake-carburetor-efi-fuel-and-exhaust/26591-exhaust-gaskets-are-new-ones-needed-everytime?t=44022\\ |
| - | http://xlforum.net/forums/showthread.php?t=143646\\ | + | https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-intake-and-exhaust/sportster-motorcycle-air-intake-carburetor-efi-fuel-and-exhaust/44394-exhaust-port-gasket-help?t=143646\\ |
| - | http://xlforum.net/forums/showthread.php?t=204486\\ | + | https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-motor-top-end/49878-cometic-gaskets?t=204486\\ |
| - | http://xlforum.net/forums/showthread.php?t=856566\\ | + | https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-intake-and-exhaust/sportster-motorcycle-air-intake-carburetor-efi-fuel-and-exhaust/99840-exhaust-gaskets?t=856566\\ |
| - | http://xlforum.net/forums/showthread.php?t=1597528\\ | + | https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-intake-and-exhaust/sportster-motorcycle-air-intake-carburetor-efi-fuel-and-exhaust/146979-se-exhaust-gaskets?t=1597528\\ |
| - | http://xlforum.net/forums/showthread.php?t=1779860\\ | + | https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-intake-and-exhaust/sportster-motorcycle-air-intake-carburetor-efi-fuel-and-exhaust/165416-se-exhaust-gaskets-are-junk?t=1779860\\ |
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| - | Here are some comments from this thread: (http://xlforum.net/forums/showthread.php?t=558421) | + | Here are some comments from this thread: (https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-intake-and-exhaust/sportster-motorcycle-air-intake-carburetor-efi-fuel-and-exhaust/77767-exhaust-gasket-se-or-oem?t=558421) |
| "The SE ones are preferred by almost every engine builder I've ever spoken to.. More so then any of the aftermarket versions.. They are generally much better at sealing and last longer then the stock ones." | "The SE ones are preferred by almost every engine builder I've ever spoken to.. More so then any of the aftermarket versions.. They are generally much better at sealing and last longer then the stock ones." | ||
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| "I don't get it, I have swapped back and forth from SE to stock depending on pipes for years and never had an issue intalling the stock gaskets. Yes they are more difficult than the SE but you just work them in one edge slightly in then in a circle pattern until just the edge is in all the way around then keep pushing them in in the same manner until they are seated. Then I take and run my thumb all the way around the inside to make sure they are completely smooth. When installing the exhaust you do so CAREFULLY. Leave the clamp out of the way and pull the heat shields if you can't see up there perfectly. Center the pipe in the gasket and hold tight, slide up the clamp, install the nuts and tighten them evenly. Then again the SE ones work good too and are easier to install. I think if the stock head pipes are on it and you can get the stock seals installed and done correctly that they will last longer, but hey to each is his own." | "I don't get it, I have swapped back and forth from SE to stock depending on pipes for years and never had an issue intalling the stock gaskets. Yes they are more difficult than the SE but you just work them in one edge slightly in then in a circle pattern until just the edge is in all the way around then keep pushing them in in the same manner until they are seated. Then I take and run my thumb all the way around the inside to make sure they are completely smooth. When installing the exhaust you do so CAREFULLY. Leave the clamp out of the way and pull the heat shields if you can't see up there perfectly. Center the pipe in the gasket and hold tight, slide up the clamp, install the nuts and tighten them evenly. Then again the SE ones work good too and are easier to install. I think if the stock head pipes are on it and you can get the stock seals installed and done correctly that they will last longer, but hey to each is his own." | ||
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| There is a Jims (#788) Exhaust Seal Installation Tool: ([[techtalk:ref:tools167#jims_788_exhaust_seal_installation_tool|Sportsterpedia Tool Section for Jims #788]]) | There is a Jims (#788) Exhaust Seal Installation Tool: ([[techtalk:ref:tools167#jims_788_exhaust_seal_installation_tool|Sportsterpedia Tool Section for Jims #788]]) | ||
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| | Scremin Eagle Exhaust Port Gasket (17048-98)\\ \\ Notice that the gasket is squared off. | {{:techtalk:evo:carb:exhaust-gasket-se-17048-98.jpg?direct&300|}} | | | Scremin Eagle Exhaust Port Gasket (17048-98)\\ \\ Notice that the gasket is squared off. | {{:techtalk:evo:carb:exhaust-gasket-se-17048-98.jpg?direct&300|}} | | ||
| | Aftermarket Copper Ring Exhaust Port Gasket\\ \\ Essentially an o-ring shape. | {{:techtalk:evo:carb:exhaust-gasket-alt-copper.jpg?direct&300|}} | | | Aftermarket Copper Ring Exhaust Port Gasket\\ \\ Essentially an o-ring shape. | {{:techtalk:evo:carb:exhaust-gasket-alt-copper.jpg?direct&300|}} | | ||
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| ====== Exhaust Pipes & Cams - Power or Reversion ====== | ====== Exhaust Pipes & Cams - Power or Reversion ====== | ||
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| Back Pressure is NOT a good thing. But it may come along with other efforts to make a good exhaust. | 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):**((https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-motor-top-end/110036-s1-lightning-heads?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? (Note: It doesn't.) | 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.) | ||
| Line 74: | Line 70: | ||
| Devices that provide diffusion or alter timing while introducing "back-pressure" will incur some pumping losses. But the wave timing is the dominant effect. So even though the back-pressure is a bad thing, it's more than made up for by the corrected wave timing. Back pressure is not what helps, it's a bad side effect of what helps. But if you can provide the proper wave timing without introducing back pressure, it runs even better. That's very difficult to do on a motorcycle, running at low rpm, where the system needs to be long and space is at a premium. | Devices that provide diffusion or alter timing while introducing "back-pressure" will incur some pumping losses. But the wave timing is the dominant effect. So even though the back-pressure is a bad thing, it's more than made up for by the corrected wave timing. Back pressure is not what helps, it's a bad side effect of what helps. But if you can provide the proper wave timing without introducing back pressure, it runs even better. That's very difficult to do on a motorcycle, running at low rpm, where the system needs to be long and space is at a premium. | ||
| - | And ((http://xlforum.net/vbportal/forums/showthread.php?t=1028905 - Post#23)) | + | And ((https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-motor-top-end/110036-s1-lightning-heads?t=1028905 - Post#23)) |
| I think we can all agree that, while the exhaust valve is closed, it's pretty irrelevant what the exhaust system is doing. | I think we can all agree that, while the exhaust valve is closed, it's pretty irrelevant what the exhaust system is doing. | ||
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| An XLForum discussion about stock 'D' cams versus Andrews 'N4' cams: | 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):**((https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-motor-top-end/110036-s1-lightning-heads?t=1028905 - Post#12)) |
| Well, contrary to what you might hear, the N4's are quite capable of delivering more bottom end than the stock D cams. The reason is that they have overlap, where the "D" cams have very little. | Well, contrary to what you might hear, the N4's are quite capable of delivering more bottom end than the stock D cams. The reason is that they have overlap, where the "D" cams have very little. | ||
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| (end quote) | (end quote) | ||
| - | **Quoting Aaron Wilson from the XLForum (aswracing):** ((http://xlforum.net/vbportal/forums/showthread.php?t=1637390 - Post#8)) | + | **Quoting Aaron Wilson from the XLForum (aswracing):** ((https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-bottom-end/151669-n4-cams?t=1637390 - Post#8)) |
| With respect to your question on the powerband, it has an __enormous__ amount to do with the pipe.\\ | With respect to your question on the powerband, it has an __enormous__ amount to do with the pipe.\\ | ||
