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28-01-2019, 08:33 PM | #31 |
Anglo-Saxon Warrior
Join Date: Aug 2002
Location: North Yorkshire
Bike: M900
Posts: 2,485
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NO ICE, GUN IT! |
29-01-2019, 10:34 AM | #32 |
No turn left unstoned
Join Date: Jun 2010
Location: leicester
Bike: M750
Posts: 4,554
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Hmm .. having once again taken the hacksaw to my system, those neat welds are making me twitch.
Glad you've sorted that though ... I never was a fan of exhaust wrap, so I'm happy that it was only temporary. That's quite a neat bit of pipery at the junction. |
29-01-2019, 11:07 AM | #33 |
No turn left unstoned
Join Date: Jun 2010
Location: leicester
Bike: M750
Posts: 4,554
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So, last night I finished the second (temporary) adaptor stub with the tapered bore.
Worked a treat. I also found that I can fine tune the fit of the system by adjusting the effective length of the stubs. This will be very handy, particularly as my first attempt at shortening the headers for the 750 (by removing 10mm from the rear one) had been a tad ambitious. I then took the plunge and hacked off all of the damaged section from the front header. I also hacked Capo's old link pipe (actually from an S4RS, it turns out) into a suitable length to replace the removed section. As a happy accident, the connector sleeves on the end of said S4RS link pipes were cut off to yield a pair of close-fitting external sleeves which will enable me to temporarily join the pipes together during the initial re-fitting process, prior to welding. With any luck I will also be able to use them, along with clamps, to hold the mating sections together during tack-welding (which will have to be done off the bike). I'll just drill three holes in the sleeves, to access the welds. So, I'm off to the shed now with a collection of bits of pipe, hacksaw, file and cuppa. And a bit of a grin. A few days ago I was thinking that I might get this system modded and welded, ready to use by late spring. The Weekender was a loose deadline. I now rather fancy that I might phone the welder as early as later this week. I love it when jobs go smoothly. Its often the other way round. |
29-01-2019, 03:56 PM | #34 |
Lord of the Rings
Join Date: May 2013
Location: Norwich
Bike: M900sie
Posts: 5,935
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The wind's changed then?...
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03-02-2019, 09:32 AM | #35 | |
Registered User
Join Date: Mar 2010
Location: Beachtown
Bike: M900
Posts: 2,188
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Quote:
Mark at MADASL also did a Spaghetti system which currently he is not making but he might if there was enough interest so I am trying to get some comparative costs of copying my system by the people who made my little race bikes' exhaust and that from Mark.
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03-02-2019, 09:35 AM | #36 | |
Registered User
Join Date: Mar 2010
Location: Beachtown
Bike: M900
Posts: 2,188
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Quote:
Let me know and I will dig out the box of pipes and get the vernier at the ready.
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You're perfect, yes, it's true- But without me you're only you! |
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03-02-2019, 11:14 AM | #37 |
No turn left unstoned
Join Date: Jun 2010
Location: leicester
Bike: M750
Posts: 4,554
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No worries, Flip.
I think I've sussed how your system works now. It looks like the flanges are captive, in that they are held between the two end welds on the short terminal sections closest to the heads. Thus the first short section of header tube is bolted to the heads, with subsequent sections connected to each other via spring retained slip joints. This is a different set-up to the others which have a short, straight, machined stub bolted in via loose-fit flanges, with the first proper header section being retained to those by springs which connect directly to the flanges. ..... if that makes any sense. I'm still curious as to whether there is a step where the headers abutt the exhaust ports on your system but its academic really so I don't think there's any need to go rummaging with the vernier .... but thanks. |
01-03-2019, 11:25 AM | #38 |
No turn left unstoned
Join Date: Jun 2010
Location: leicester
Bike: M750
Posts: 4,554
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Bit of an update ...
I've made the connector stubs. The design includes a short section where the bore tapers from the 750 exhaust port dia to the big bore pipe dia, over about a 10mm length. It looks "right" at least ... time will tell as to how well it functions. I had a bit of a setback with the welding. Last time I needed some welding done (beyond my personal skill level) I found a brilliant guy to do the job. He actually had the exhaust from Michael Dunlop's TT BMW on the bench when I first went there, so I knew I had the right guy for the job. But, 12 months later I find that he's packed up shop and gone to earn better money welding for Rolls Royce. Bugger. So, long story short, I've just got back from the car exhaust place down the road, clutching my newly welded system. Actually its not fully welded yet .. I've left one joint just tacked so that I can do a trial fit and check that nothing has moved before getting the final joint welded. I had to settle for mig rather than tig but the welder is a biker himself so at least he had the right kind of empathy. The finished welds aren't too snotty and should dress up quite neatly. As soon as I've finished my coffee and my bacon and brie panini, I'll be heading nervously out to the shed to try it for fit. Wish me luck. |
01-03-2019, 02:23 PM | #39 |
No turn left unstoned
Join Date: Jun 2010
Location: leicester
Bike: M750
Posts: 4,554
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Update, part two ...
The trial fitting (before welding the last joint) went very well indeed. In fact, I could detect no movement during welding whatsoever. So, I've nipped back down the road and had the final joint finish welded. And .... It still fits like it grew there. In fact, although the headers are a very close, sliding fit in the stubs, if I remove the retaining springs from the front header, it will slide smoothly in its stub if you tug it gently. So everything must be pretty much aligned. Whoopee ! Just two more hurdles to go now. 1) Does it leak at the stubs ? 2) How does it perform ? I was going to do the valve clearances before I roll the bike out again but I might just have to start it ... and answer the other question which now (of course) occurs to me, namely .. How does it sound ? |
01-03-2019, 04:41 PM | #40 |
Lord of the Rings
Join Date: May 2013
Location: Norwich
Bike: M900sie
Posts: 5,935
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Sounds like you're getting there with it now. But you know the rules on here... Pictures or it didn't happen..
Hope the sound is as good as your expectations.
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01-03-2019, 05:17 PM | #41 |
Nothing to see here
Join Date: May 2005
Location: brough
Bike: M1100evo
Posts: 1,548
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Well done Jeff!
You must be exhausted. |
25-03-2019, 12:27 PM | #42 | |
Registered User
Join Date: Feb 2009
Location: Chatham
Bike: Multiple Monsters
Posts: 714
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Quote:
I've fixed a couple of jobs where normal/carbon steel wire was used on stainless it works and will hold, sometimes for quite a while but along with quickly rusting it will eventually crack along the toes of the weld. If your going to be blending out the welds use clean fresh abrasives. Using abrasives that have been used on other steels can smear grains of the other steels from the abrasives into the surface of your stainless leaving you with stainless with rust spots after a while.
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25-03-2019, 01:57 PM | #43 |
No turn left unstoned
Join Date: Jun 2010
Location: leicester
Bike: M750
Posts: 4,554
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Well to be perfectly honest I don't remember asking, but that was because I was pretty sure that it would be stainless wire ... he only deals with stainless exhaust fabrication.
And yes, I have blended the welds (well 90% anyway). I used a flap wheel that I have only previously used on ally. Tbh, I feel a bit disappointed that I wasn't able to get some of your own welding work on the bike, for sentiment as much as quality, but the logistics of clamping it all up and then getting it down south without it moving precluded that, sadly. The guy who did it works within walking distance of my house. This has all got me motivated to buy myself a little tig machine and have a go myself in future. Welding has always been one of those engineering skills that I have lacked (though I did dip my toe in the mig pool last year). Latest news is that I fired the bike up in the shed and, on first impressions, it is "illegitimately" loud. So I made up a little db killer type of baffle using a cone of Capo's left over perforated (stainless) core tube and nipped down the road to get it welded up. Seems to work quite well and although it may not be a permanent fixture, it gives me options. The sound is just as I had hoped .. not so much a harsh "brapp" but more of a bass "bwop" if you see what I mean. A few pics will hopefully follow, once I've sorted out the "postimage" thing. |
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