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98pacecar
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« on: January 28, 2014, 07:22:04 AM » |
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After reading, twice,,,,,,,,,,,,, (in da 6 inta 6 thread) dat the OEM header pipes are,,, double walled,, I need ta ask ARE they,,,,, errrr not?  I figured they were, n' recently, said so to another valk owner,,, who told me they, were,,,,, NOT.......  Soooo, which,,,,, IS IT ?? ??? Double,,, errr,,,, single ??  |
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John Schmidt
Member
Posts: 15237
a/k/a Stuffy. '99 I/S Valk Roadsmith Trike
De Pere, WI (Green Bay)
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« Reply #1 on: January 28, 2014, 07:27:41 AM » |
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Yes, that's the main reason they don't blue/turn color unless you really cook them because your carbs are out of whack....or you idle it too long.
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98pacecar
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« Reply #2 on: January 28, 2014, 02:03:53 PM » |
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Ok since no one has offered, a,,,,,,,,,,, rebuttal... Thank you John, fer confirming,,,,,,,,, my belief...  |
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wiggydotcom
Member
Posts: 3387
Do Your Best and Miss the Rest!
Yorkville, Illinois
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« Reply #3 on: January 28, 2014, 02:36:20 PM » |
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I'll second what John said..  |
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VRCC #10177 VRCCDS #239  |
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98pacecar
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« Reply #4 on: January 28, 2014, 03:43:54 PM » |
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2 zip fer,,, double wall......... |
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Ricky-D
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« Reply #5 on: January 28, 2014, 04:44:16 PM » |
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A look inside the receiving end of the exhaust pipes will reveal the reduced diameter of the inner pipe. They are about the same diameter as the piggies at the end of the muffler.
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2000_Valkyrie_Interstate
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MarkT
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Posts: 5196
VRCC #437 "Form follows Function"
Colorado Front Range - elevation 2.005 km
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« Reply #6 on: January 30, 2014, 08:56:24 AM » |
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They are about the same diameter as the piggies at the end of the muffler.
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ID of the header inside tube mics at 22.45mm. ID of the piggies mics at 19.50mm. So the area of the headers is 395.84mm 2 while the exhaust is 298.65mm 2. So the headers are 32.54% larger in area and potential volume of gas passed. |
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« Last Edit: January 30, 2014, 10:34:03 AM by MarkT »
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pancho
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« Reply #7 on: January 30, 2014, 01:37:58 PM » |
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They are about the same diameter as the piggies at the end of the muffler.
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ID of the header inside tube mics at 22.45mm. ID of the piggies mics at 19.50mm. So the area of the headers is 395.84mm 2 while the exhaust is 298.65mm 2. So the headers are 32.54% larger in area and potential volume of gas passed. Well, your math is correct, so if your measurements are correct... that would mean more pressure at the end of the exhaust system, hence, some backpressure as the same amount of gas must be passing at both ends (HA..think about that!!) I wonder if that is why stock pipes deliver more HP than straight pipes like cobras?? It is probably a bit more complicated than that, but that may be part of the equation. |
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The most expensive things you will purchase, are those things you would not have needed if you had listened and obeyed.
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F6Dave
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« Reply #8 on: January 30, 2014, 02:29:56 PM » |
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I remember when I bought my new BMW airhead with OEM chrome single wall pipes. They looked so pretty at the dealership, but by the time I got it home they were already blue.
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BlueValk
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« Reply #9 on: January 30, 2014, 04:57:00 PM » |
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Just a thought about the difference in diameters. The exhaust temp may be considerably cooler by the time the piggies are hit, so would have less pressure, and need less diameter.
I know I have put my hand pretty close to the end of exhausts in the past without a problem (hot and damp, but not burning). I probably could not do that right at the end of the headers.
Just my .02.
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pancho
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« Reply #10 on: January 30, 2014, 05:01:52 PM » |
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Just a thought about the difference in diameters. The exhaust temp may be considerably cooler by the time the piggies are hit, so would have less pressure, and need less diameter.
I know I have put my hand pretty close to the end of exhausts in the past without a problem (hot and damp, but not burning). I probably could not do that right at the end of the headers.
Just my .02.
Yeah, thats a valid point. |
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The most expensive things you will purchase, are those things you would not have needed if you had listened and obeyed.
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8Track
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« Reply #11 on: January 30, 2014, 06:15:46 PM » |
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So if your piggies have been cut off, has there been a loss of horsepower? Mine have been cut by a PO.
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donaldcc
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« Reply #12 on: January 30, 2014, 08:13:49 PM » |
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So I had cobras when I first got bike and about a year later I bought some OEM pipes off e-bay and changed them. the headers are blue and gold so I guess they were really heated up???
i also have another set of OEMs with about 200 miles on them I got off craigslist for $220-250 (can't remember) from a lady whose father took them off right after getting bike 14 years ago and she wanted them out of the garage. they are pristine
so the ones I have on bike had too rich fuel or sat there forever with bike running???
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« Last Edit: January 30, 2014, 08:15:20 PM by donaldcc »
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Don
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