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68C

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68C last won the day on May 18

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About 68C

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    Forum-aholic
  • Birthday 01/30/1952

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  • My bikes
    2004 V11 Le Mans Rosso Corsa with MyEcu (sometimes)
  • Location
    southampton, UK

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  • Interests
    Tinkering, motorcycles, simple electronics, lawnmowers, gardening, DIY, people.
    Norton Commando 750
    Guzzi V11, T3
    Yamaha FZ750
    Yamaha DT250MX
    BSA Sunbeam 250 twin
    Royal Enfield 750 bitza
    Triumph Trident 900 with sidecar
    BSA 500 M20
    Harley Davidson 883 Sportster, kickstart

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  1. That is exactly how I see it. Our OEM pipes were probably designed to tuck the system away neatly under the bike, perhaps for cornering clearance but most likely cosmetic. There may be a weight saving in having two smaller shared silencers. All this discussion about Stucchi, Mistral et al is really about which system is least bad, none of them probably enhance power over the Tonti H system. Two seperate pipes may even work best for peak power. Hence that system that looked like a crossover but had no hole between them. But, as I said I do find the V twin exhaust system confusing.
  2. And how is that pulse timed to help the extraction. I can believe it will help on one cylinder but, unless you quickly change the pipe lengths, how does it help the cylinder? Edit, should say 'other cylinder'
  3. Sorry po18guy, I really do not follow your logic. How are the pulses timed? They cannot be even due to it being a 90' V twin. Why do you think it will improve mid range and top end?
  4. Touring motors seem to be getting bigger, sports motors smaller. There were a lot of 1000cc V twins around before the second world war, took another fifty years for them to come back. Cost of a V twin construction killed them in the first instance. Difficulty in getting real power from them now is the limitation. Ok, Aprilia can do it but with motors that are a little fragile. A friend bought a wrecked Tuono motor to strip for spares, a rod had gone, everything was useless, both heads smashed valves, the rod even punched a hole into the gearbox to chew on the gears. To be fair the clutch would have been usable but oddly it did not come with the motor.
  5. Still very confused how a V11 crossover works. The two down pipes are different lengths, the four stroke 90' V twin exhaust timing is not even. I understand how a parallel 360' crank can have even length down pipes and by merging at the correct point can make use of the scavenge effect from the other cylinder, albeit probably really effective at one throttle opening and one rpm. But how all that uneven scavenging would help a V twin I cannot work out. In my confusion I did once draw out the V twin exhaust timing as a graph, did not help, perhaps if one cylinder had a much longer down pipe. Looking at the HD 45' V twin layout made even less sense, yet loads of clever exhaust systems on the market. Then throw in that other thread with the dented down pipes.......
  6. My Dad lived on a farm in Dorset as a lad, he often spoke of seeing and hearing Lawence and his Brough riding along the main road near Blandford army camp. It was rumoured locally he would go through a set of tyres in a two week leave. Dad also told a story about Geoff Duke racing at Blandford Camp, he came to a bend and saw a rider laying in the track. Sadly he was dead, at the inquest Duke was asked how he avoided hitting him, 'Oh, I just laid the bike down and slid to a stop.'.
  7. Well, I suppose I stand corrected. Assuming its not a spoof video.
  8. So if both both pipes have flats there must me a restriction in the pipes at that point. Looks like a case of Form over Function.
  9. Does not need any deep thought this one, they do not want want folk speeding along and only slowing down at the speed cameras. They want us to obey the speed limits, either because we agree it is the right thing to do or because we are scared of being caught in 'unknown ' speed traps.
  10. The youngest Rosso Corsa you can find. Has full Ohlin suspension, the latest fuel map, no gearcase cracking problem, and of course it is red.
  11. Found this and just had to post it, I cannot think of a better comment than Peanut's.
  12. Beauty is in the eye of the beholder, not in mine though.
  13. Tried the speed bleeders many years ago, good idea in theory. After a time it is common for bleed nipples to become tight and difficult to remove, the problem with these is they seem to be weaker than standard nipples and shear off easily. This is probably due to the larger hole needed to accommodate the valve. Once sheared off difficult to remove as the hardened valve spindle makes it difficult to drill accurately for an eezy out stud remover.
  14. Your mum's old electric kettle was chromed to keep the heat in. We all know a matt black surface will give off heat well, a polished surface will help to keep it in so not so good for an aircooled engined. I have to admit I have polished my 850T3 covers, the look lovely and have caused no problem.
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