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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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Wed, 13 October 2004 13:51
 
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one of the most interesting threads for ages 
when thinking about these things i like to try and seperate the port velocity and port length as seperate entities..
port length is (almost) controlled by harmonics alone.
port velocity is (almost) controlled by the port/runner diameters and tapers etc etc.
well thats what i think anyway...
the other approach in my head is that velocity is what fills the cylinders, and harmonics are what give you the extra little bit (like 5%).. if you have bad velocity but good harmonics, it's still a bad motor.
if you have good velocity, but bad harmonics, then you are probably only goign to be down a max of 10%(?) on what you could get...
for bens runners, giving good mid range, they are probably doing more for velocity than harmonics..
i dunno... harmonics need a lot of energy (read, RPM) to get them working hard. F1 get maybe +25-30% from harmonics, and bikes maybe 10-15%, but below 10,000rpm, maybe there is not enough energy to make massive differences...
i realise why you are doing it, and i feel the same way (make it the best it can be for what it is)...
anyways, just thought i'd add a few thoughts (with no scientific backing )
Cya, Stewart
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ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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ed_ma61 | Mon, 11 October 2004 14:59 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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oldcorollas | Mon, 11 October 2004 15:13 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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ed_ma61 | Mon, 11 October 2004 15:16 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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ed_ma61 | Mon, 11 October 2004 15:23 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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bbaacchhyy | Mon, 11 October 2004 21:25 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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takai | Mon, 11 October 2004 21:43 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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bbaacchhyy | Mon, 11 October 2004 22:15 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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Steve_Reynolds | Mon, 11 October 2004 23:10 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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gianttomato | Mon, 11 October 2004 23:22 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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Ben Wilson | Tue, 12 October 2004 05:25 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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gianttomato | Wed, 13 October 2004 13:05 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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thechuckster | Wed, 13 October 2004 13:38 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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oldcorollas | Wed, 13 October 2004 13:51 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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ed_ma61 | Wed, 13 October 2004 14:45 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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Bill Sherwood | Wed, 13 October 2004 14:48 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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ed_ma61 | Wed, 13 October 2004 15:04 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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ed_ma61 | Wed, 13 October 2004 14:58 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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Bill Sherwood | Wed, 13 October 2004 15:06 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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Bill Sherwood | Wed, 13 October 2004 15:07 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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ed_ma61 | Wed, 13 October 2004 15:30 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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ed_ma61 | Wed, 13 October 2004 15:40 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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Bill Sherwood | Wed, 13 October 2004 15:40 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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ed_ma61 | Wed, 13 October 2004 15:42 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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Bill Sherwood | Wed, 13 October 2004 15:45 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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ed_ma61 | Wed, 13 October 2004 15:50 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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bbaacchhyy | Wed, 13 October 2004 21:36 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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ed_ma61 | Thu, 14 October 2004 01:34 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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bbaacchhyy | Thu, 14 October 2004 02:08 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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ed_ma61 | Thu, 14 October 2004 02:26 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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moo4AGZETA22 | Thu, 14 October 2004 02:49 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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bbaacchhyy | Thu, 14 October 2004 03:09 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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gianttomato | Thu, 14 October 2004 03:52 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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ed_ma61 | Thu, 14 October 2004 04:15 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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gianttomato | Thu, 14 October 2004 04:27 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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bbaacchhyy | Thu, 14 October 2004 05:06 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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gianttomato | Thu, 14 October 2004 05:21 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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bbaacchhyy | Thu, 14 October 2004 05:32 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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boxh34d | Thu, 14 October 2004 12:21 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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ed_ma61 | Fri, 15 October 2004 00:22 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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justcallmefrank | Fri, 15 October 2004 00:39 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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mrshin | Thu, 14 October 2004 12:54 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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RWDboy | Thu, 14 October 2004 14:51 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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Bill Sherwood | Thu, 14 October 2004 15:17 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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gianttomato | Thu, 14 October 2004 21:25 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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ed_ma61 | Thu, 14 October 2004 23:42 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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ed_ma61 | Fri, 15 October 2004 00:33 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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ed_ma61 | Fri, 15 October 2004 00:46 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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justcallmefrank | Fri, 15 October 2004 00:50 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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ed_ma61 | Fri, 15 October 2004 00:51 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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justcallmefrank | Fri, 15 October 2004 00:56 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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justcallmefrank | Fri, 15 October 2004 01:00 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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ed_ma61 | Fri, 15 October 2004 02:35 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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SupraPete | Fri, 15 October 2004 02:55 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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SupraPete | Fri, 15 October 2004 02:45 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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ed_ma61 | Fri, 15 October 2004 02:59 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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ed_ma61 | Fri, 15 October 2004 03:01 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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SupraPete | Fri, 15 October 2004 03:11 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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SupraPete | Fri, 15 October 2004 03:21 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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SupraPete | Fri, 15 October 2004 03:14 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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RWDboy | Fri, 15 October 2004 03:19 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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ed_ma61 | Fri, 15 October 2004 03:26 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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SupraPete | Fri, 15 October 2004 03:28 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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ed_ma61 | Fri, 15 October 2004 03:35 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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gianttomato | Fri, 15 October 2004 03:55 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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Bill Sherwood | Fri, 15 October 2004 04:44 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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ed_ma61 | Fri, 15 October 2004 04:50 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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CelicaRA45 | Sat, 16 October 2004 03:38 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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mrshin | Sat, 16 October 2004 13:30 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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Bill Sherwood | Sat, 16 October 2004 13:55 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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mrshin | Sat, 16 October 2004 14:37 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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RWDboy | Sun, 17 October 2004 08:29 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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ed_ma61 | Sun, 17 October 2004 10:12 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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RWDboy | Sun, 17 October 2004 11:12 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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ed_ma61 | Sun, 17 October 2004 12:13 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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Bill Sherwood | Sun, 17 October 2004 13:19 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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ed_ma61 | Sun, 17 October 2004 22:55 |
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Re: ITBs & Port X-Sectional Areas + Lengths : Your Thoughts....
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Bill Sherwood | Mon, 18 October 2004 02:40 |
