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minimutly
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« Reply #1695 on: January 04, 2017, 11:01:03 PM » |
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I would use the largest perfrated tube that will allow a layer of wadding, the longest thatt will fit. Also go for proper perforated tube, it works much better than that 2 stroke tube. I think you'll be suprised how quiet it will be, and if not quiet enough you can still couple the two together, that would halve the pulse size.
My 750 four is on a single race can, 500 odd mm long, straight through, on a 4 into 1. Its just about perfect, I reckon.
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Bus Boy
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« Reply #1696 on: January 04, 2017, 11:08:47 PM » |
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 Manky's XS650 Yamaha  Manky's XS650 Yamaha I made these for my TL1000 race cans cos they were thumpingly harsh. They are only 8'' long but work really well for reducing the hash noise level. Even went through M.O.T. with these fitted! |
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Manky Monkey
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« Reply #1697 on: January 05, 2017, 09:36:33 PM » |
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 Alternator brushes arrived today. I'll try & have a look at fitting them over the weekend.
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Manky Monkey
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« Reply #1698 on: January 05, 2017, 09:41:23 PM » |
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Modified the new front indicators this afternoon. I've used this type on several of my trikes & found it was handy to have a tell tale light to show they were working. Bought a pair of cheap dashboard warning lights from Halfords, then cut the heads off them to make amber lenses. Drilled the backs of the ali' units so the light from the bulbs will show through. The bodies will be powder coated black, then I'll glue the lenses in place.
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Manky Monkey
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« Reply #1699 on: January 05, 2017, 09:42:55 PM » |
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While I was in Halfords I also bought a 6 way blade fuse box.
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Manky Monkey
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« Reply #1700 on: January 05, 2017, 10:34:09 PM » |
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Stolen from Mr Kapri's "Continuum" BIVA/MSVA advice page on FaceBook:
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stinkey
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« Reply #1701 on: January 06, 2017, 01:16:16 AM » |
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Screw you sir !  |
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Backyard hotrodder,learnt by mistake,still learning ?
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Bus Boy
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« Reply #1702 on: January 06, 2017, 04:09:07 AM » |
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All gettin' a bit Freudian this.......HOLES.......SCREWS........!!!!  |
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stinkey
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« Reply #1703 on: January 06, 2017, 07:48:57 AM » |
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Can't see what dear old Clement has anything to do with it ?  |
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Manky Monkey
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« Reply #1704 on: January 06, 2017, 06:17:19 PM » |
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You're showing your age mate! So, my learned friends, I'm curious -would the spirally, screwy thing work & what effect would it have on engine running, (back pressure, pulsing etc)? Worth a go? |
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flc
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« Reply #1705 on: January 06, 2017, 06:29:23 PM » |
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I think ( so this is a guess at best) that to quieten an exhaust you have to deflect or break up the pulse, some performance back boxes I've seen cut up have two tubes at opposite sides that are not connected, ends blanked off ( usually squashed ) and the exhaust air passes from One tube to the other by the small holes/ perforations in them, so I think yes it would make less noise but you can only test it to be sure, does seem expensive unless you could make a spiral your self?
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stinkey
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« Reply #1706 on: January 06, 2017, 06:48:47 PM » |
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Would you mount the screwy thing on bearings so it spins ? And maybe a light too ? OOH ..shiney spinney things..OOH OOH |
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flc
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« Reply #1707 on: January 06, 2017, 07:27:47 PM » |
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Then it would whistle Do it do it! Thinking a bit more, the eBay one looks to have an inch(or so) center pipe so not sure how you would rig it? Also I recon that whilst it may slow the flow, it won't actually break up the pulse so not giving up any noise and yes it could whistle I'd like to see the results though, Other one is vw baffles the short exhaust end pipes are internally baffled, years ago a mate had a bonnie that ran them, I don't have a set to loan you but could ask around the vw crowd? |
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« Last Edit: January 06, 2017, 07:42:39 PM by flc »
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« Reply #1708 on: January 06, 2017, 07:55:40 PM » |
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I've tried these several times over the years, but never had any success with them.
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Manky Monkey
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« Reply #1709 on: January 06, 2017, 07:58:45 PM » |
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VW "Cannon" baffle.
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