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Redscuell
| | Posted on Wednesday, September 23, 2009 - 03:28 am: | 
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Crawl back in your hole, fresno; as a Yank you're not qualified to use the Aussie term "wanker". I will, however, permit you to use the Aussie term "arsehole" when you're looking in the mirror.
By the way, I'm both an Aussie and a Yank. Voted for every Republican presidential candidate since Nixon, and for Arnie, too, back in the day.
Here are more pics, for those who are actually looking for info, and facts (that leaves fresno out, who has always opted for feminine intuition):
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Redscuell
| | Posted on Wednesday, September 23, 2009 - 03:45 am: |
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Further to my response to fresno, included in above: I made an offer to Blake that I would keep my comments positive and constructive, this being a "fan" site and all -- EXCEPT in the case of mindless posts in response to my own.
A reasonable person would be able to follow my logic and my facts; fresno cannot; therefore, fresno is not a reasonable person. It's a syllogism:
Description of syllogism - American HeritageŽ Dictionary
NOUN: 1. Logic A form of deductive reasoning consisting of a major premise, a minor premise, and a conclusion; for example, All humans are mortal, the major premise, I am a human, the minor premise, therefore, I am mortal, the conclusion. |
Chadhargis
| | Posted on Wednesday, September 23, 2009 - 12:41 pm: |
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I can just feel the love here.  |
Froggy
| | Posted on Wednesday, September 23, 2009 - 02:22 pm: |
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Red I think I mentioned it before, but I like what you did. |
Prophet_136
| | Posted on Wednesday, September 23, 2009 - 02:27 pm: |
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redscuell- can you post some pictures of the whole bike, i would like to see how that looks as a whole, great idea by the way. |
Xl1200r
| | Posted on Wednesday, September 23, 2009 - 02:41 pm: |
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And then note that f) the pair of final outlet tubes are only 32mm each -- calculate the areas and you'll see that the TOTAL area of the two is HALF that of all that preceded them.
A reasonable person would be able to follow my logic and my facts;
Red - based on the fact that you added up all of the areas of all of the exhaust tubing leaving the cylinder head, your logic has one major flaw in that you assume both cylinders are firing at the same time.
Based on the math, having an outlet half the size of the total of the exhaust inlets makes sense on a v-twin.
However, I do appreciate your approach on the muffler. It's not all that different than some other folks have tried, but it is different enough and surely the cleanest, best looking attempt I've seen. |
Fresnobuell
| | Posted on Wednesday, September 23, 2009 - 03:33 pm: |
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Eh, show us the baseline run. Your dyno chart is meaningless without it. |
Xl1200r
| | Posted on Wednesday, September 23, 2009 - 03:51 pm: |
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It's also uncorrected, which means it's likely meaningless even with a baseline run. |
Carbonbigfoot
| | Posted on Wednesday, September 23, 2009 - 06:30 pm: |
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Am I the only one that thinks the word abomination applies here?
Interesting approach, but I don't like the looks. There is a pretty severe disconnect in the different styles.
R
(Message edited by carbonbigfoot on September 23, 2009) |
Stevel
| | Posted on Thursday, September 24, 2009 - 05:09 pm: |
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Red,
Good job.....shows initiative. This is what hotrodding is all about. You know there is a reason why your volume math didn't compute. I believe you forgot to consider volume change due to cooling. Here is a hint. To calculate exhaust volume, the volume at the exhaust port is equal to the engine volume times 1/2 the rpm times the volumetric efficiency times 2.5 (600 degrees C) However, the volume of the exhaust gases will decrease as it cools. At 400 degrees, the expansion rate will have dropped from 2.5 to about 1.6. Hence the decrease in chamber and tubing size change. It is part of the original design for that reason. The efficiency of the original design starts to fall off if gas velocity changes. The reason the original design works so well is that the sound reflection creates a dynamic back pressure wave (think reversion) that limits the reflected vacuum signal at the exhaust valve at the tail end of cam overlap time, which attenuates raw fuel and air entering the exhaust system before the exhaust valve totally closes. It kind of works like a variable expansion chamber. Very slick!
Now, when you made your dyno runs, had you been monitoring Brake Mean Fuel Consumption (BMFC), you probably would have noticed a big drop in efficiency and that would have been a clue. The power increase you observed was due to the deeper cycling of the pressure change in the primary expansion chamber, but the cost was a weaker reflected pressure wave. You are on the right track, but you can do better.
Steve |
Prophet_136
| | Posted on Sunday, September 27, 2009 - 08:11 pm: |
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so i ran with Redscuell's idea and did this:
Seat of the pants feel: stronger in the low and mid range. hoists the front wheel up without clutch manipulation now. |
Cms1172
| | Posted on Thursday, October 29, 2009 - 09:02 pm: |
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After all that work, and having it on the bike for a while. Have you noticed a drop in fuel economy, or any problems with the ECM?
It looks clean and blends in with the rest of the pipe.
What I was going to do was cut off the tips and open up the inner tubes connected to them, hopefully allowing close to the same back pressure, but also allowing more sound.
I do not like the strait through designs, and like to keep my hearing.
Anyone have input on this idea. |
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