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Pinned So what have you done to your bike today?

Discussion in 'The Pub' started by kiffsta, Nov 3, 2013.

  1. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Check out the exhausts on @jmw76 RC162 replica.
    Probably cheaper to have one made locally. If I were doing a custom 4 into 4, I would do this.
    • 4 mufflers modelled on the RC162. The Conti mufflers used on early Ducati bevel drive twins have very similar appearance and a baffle design that is not too loud but retains a great sound. So in short, 4 baby Conti's. I used to have the cones rolled and gas weld them all myself when I was a youngster. You could go full project Binky and use cardboard to make mock ups first.
    • 4 into 2 into 4 might be optimal or just 4 into 4 with a balance pipe across the headers is another approach
    • I would have short headers
    In the US you can buy exhaust bends and collectors at the corner store, like everything else. The OEM pipes are 1-1/8" which won't be common, so okay, I guess you won't get them at 7-11. Even if you can't weld them yourself, you can fit, cut and tack. Then take to proficient welder and finally have them Cerakoted in black (or just spray with VHT) tada :)
     
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    Last edited: Apr 16, 2021
  2. Gen

    Gen Well-Known Member

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    32mm stainless handrail mandrel bend exhaust

    Salt 2015 030.JPG
     
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  3. ShaneP

    ShaneP Well-Known Member Premium Member

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    I'm with @maelstrom, shorter headers for top end power, right? Or did you find something different in your testing, @Gen?
     
  4. jmw76

    jmw76 Well-Known Member Premium Member

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    Shorter headers. Well that depends on how short you make them. Yes, shortening them does shift the resonant frequency to higher rpm. But no point shift that point beyond the capability of the engine. Also 4 into 1 works best for absolute peak power but 4-2-1 works best for a decent spread of power. Individual pipes look great but can only deliver best performance as a megaphone system which generates lots of noise.
     
  5. Gen

    Gen Well-Known Member

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    My Bike:
    blown CBR250r
    I made the headers the same length as the stock MC19's, The supercharger threw the power band out the window, & pulled like real bike when the throttle was opened in anger, regardless of the rpm, although it was all over red rover @ 16,300 (indicated) rpm, probably due to the blower's ability to keep up,,:idk:
    The video tells the bottom end story better than mere words (hornet cams increased the boost from 8/10 lb, to 15 lb boost due to the lack of valve overlap, whenever the throttle was open, the boost gauge went up, regardless of the rpm)
     
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  6. jmw76

    jmw76 Well-Known Member Premium Member

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    @Gen those pipes on your machine look great. What sort of performance did you get out of your machine?
     
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  7. Gen

    Gen Well-Known Member

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    My Bike:
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    It blew holes in OEM & China special pistons, "almost" melted a set, totally destroyed one after blowing a coolant line off mid track (unknown at the time) to get it's 1st timing slip in 5 years of trying, 110 mph,,in 5th (I forgot about 6th after boning up when 16,000 popped up on the tach, thinking I'd nailed 120 mph)
    I finally sorted the fuel delivery which dropped the EGT from 1350, to 850 a couple of years ago, but the power was too much for the clutch to handle, I had burnt a clutch aroma when going into 6th for the 1st time, and only managed 101, my co-rider Rob followed team orders & rode around the slip, stayed in 5th (again) to whoop my new record with a 107.
    Although I still recon it'll pull 125, the thrill has gone & Iv'e moved on :idk:
     
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  8. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    I am not advocating shorter headers to move peak power higher.
    The OEM CBR250 header length is not some optimum magic number. They wanted to put the collector thereabouts because of space/aesthetics or other issues. The calculated length for that engine would be very short, so the other choice is to use a harmonic that is a compromise.
    Some light reading:
    http://www.epi-eng.com/piston_engine_technology/exhaust_system_technology.htm
    https://www.musclecardiy.com/perfor...t-system-math-build-high-performance-engines/
     
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  9. Gen

    Gen Well-Known Member

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    A good mate (RIP Swiss) gave me an exhaust length/diameter calculation file, which I can share via email if anyone wants a copy
     
  10. jmw76

    jmw76 Well-Known Member Premium Member

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    Went for a little ride on the Spada today through the Dandenong ranges.
    First ride since my accident in mid Jan.
    Thumb got a bit sore towards the end but otherwise ok.
    Good to be back on the bike again.
     
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  11. ShaneP

    ShaneP Well-Known Member Premium Member

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    I, too, went for a post-accident ride to sus out the body. Yesterday I did a half hour trip to Rocky in the morning and half hour home at night: bike and I went well (bike was better after I pumped the tyres up). Took the bike to church and then for a ride afterwards. This time I noticed the wrist was a bit sore and pins&needles but good to be on the bike again. The VFR is running a bit rich, but I don't want to have to work on the carbies of that thing...
     
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  12. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Dont worry boys ... your not alone

    mm.jpg
     
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  13. jmw76

    jmw76 Well-Known Member Premium Member

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    Yep. Just watched a little post race footage of Marc sitting in the pits. Looks like his arm might be a bit sore.
    Considering what the guy has been through, 7th wasn't a bad result.
     
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  14. Tony Wilkinson

    Tony Wilkinson Wilko Premium Member

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    Making good progress on the 1990 TZR250 3MA-3 :) TZR250 3MA forks assembled 15.04.2021.jpg
     
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  15. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Not a bike but my Land Cruiser
    Had an intermittent stumble for awhile now but finally replaced the plugs and leads

    Looks like some serious arcing going on there on #4
    Plugs were overdue as well (access is terrible)

    Running sweet so far

    IMG_3517.JPG
     
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  16. samthurtell83

    samthurtell83 Grumpy Dad Premium Member

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    I tried to sort out this mess today. What a bloody nightmare. I think I'd be better off just starting from scratch. Has anyone got any recommendations for a supplier for various plugs and associated electrical gear?[​IMG]

    Sent from my SM-G988B using Tapatalk
     
  17. ShaneP

    ShaneP Well-Known Member Premium Member

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    I trailered a couple of bikes to Mackay so I could go for a ride with a mate up there. Had a couple of jobs to help out with first, but with the afternoon came the rain. Sigh, riding in the rain is just miserable, so no go. But on the way home I thought the hills around Sarina looked good, so a quick Google, there's a road with good reviews, so I unloaded a bike and went for a ride. So pretty country, the road was ordinary until the climb, then it was quality road about 3km of tight and narrow climb. One advisory sign said 20km/h, I got a little caught out at that point and grabbed a bunch of brakes: some tight and sudden corners. The recommended road goes all the way to Marlborough, but I didn't have time for that, so I took a short-cut to koumala, which was half dirt road, but had a nice (wide bitumen) decent, which I took rather more cautiously. Once loaded back on the trailer, I FINALLY tightened the losse gear shift lever. I wonder how long until I adjust the brake pedal that is higher than the shifter?!
     
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  18. ShaneP

    ShaneP Well-Known Member Premium Member

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    Narva plugs, available from Repco or such, simple spade-type terminal connectors (like in the picture), but mine started to perish after about 10years.
     
  19. Linkin

    Linkin The Apprentice Premium Member Contributing Member Dirty Wheel Club

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    MCS do connectors, my boss and thus me use them.
     
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  20. Gert

    Gert Well-Known Member Premium Member

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    Not work, just drove. After all the disasters we got with the 3LN carbs/boots, a pic with some happy bikes :)

    [​IMG]
     
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