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john.r.davies

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Everything posted by john.r.davies

  1. There seems to be some misunderstanding above about how an "extractor" manifold works! It relies on the nature of a six cylinder engine, which is two three-cylinder engines joined as mirror images of each other. An Extractor links the cylinders that fire just 360 degrees apart, as said above 6 & 1, 5&2, 4&3. The pulse of exhaust gases from one of the pair reaches the junction and is reflected up the other branch. If the length of the Primary is correct, then this reflected wave will reach the other port just as that opens, in the negative phase of the pulse wave. The
  2. You mean a 6-3-1 manifold? The criterion is the length of the primaries, which governs the rev range in which they resonate and act as extractors. Like organ pipes, the shorter the higher. Gareth Thomas, a strange man and an excellent engineer, recommends that they should be 0.43m long and exactly equal to work around top revs: They need to be longer to work at mid range, but those would need to be bespoke and will take up a lot of space or have ground clearance problems. John
  3. Yes, some time ago, after using araldite to mend a leak I blocked the tube!
  4. Have you an infrared 'gun'? Not pricey. Scan that across the warmed up radiator ans look for blocked tubes that will be cooler. John
  5. I have one that has two cigar outlets, and two USBs. You can have three outlets of each. Or, one that has FIVE USBs!
  6. And the results were..... As shown, there were a LOT of DNFs, including me, I'm sorry to say. A loud knock and loss of power led me to retire after only my second lap. Turns out that a bent push rod had caused another to go walkabout, hitting the rocker cover every other revolution! Hope you're happy with your result, Roy. Given the conditions, wet, cold track, I was with my practice time. The forecast was right about "cold"! That's not window glass, it's hail! John
  7. Many (most?) sat navs will run off a USB port, and such can be linked to a USB 'bus' that will allow more than one device to be run. On my TRansit I have a satnav, a tyre pressure monitor and it charges my phone! AND, you can find USB ports that include a Voltmeter, so you can monitor the battery health as well! EG: https://www.amazon.co.uk/Charge-Charger-Aluminum-Voltmeter-Motorcycle/dp/B07NV7579D/ref=asc_df_B07NV7579D/?tag=googshopuk-21&linkCode=df0&hvadid=218223787868&hvpos=&hvnetw=g&hvrand=2633413064086687142&hvpone=&hvptwo=&hvqmt=&hvdev=c&h
  8. This happened to me last week. Ambulance with Blues & Twos could be clearly heard approaching, so not just for the red light. I was at the front and was the only driver to move forwards cautiously to let it though. Although it was two cars behind me, no one else shifted. Fortunately, the lights changed shortly and it 'proceeded'. I had no qualms about being victimised by a traffic camera, as the Ambulance Service would have records of its vehicles' 'shouts', an d their urgency, as would the Fire Service. That would be less likely for a Police vehicle, unless it had the Blues &
  9. That eruption has died down now. But it was most spectacular! Look on YouTube for a real time episode from AndreB (e acute accent)! It just burst from the earth, and develops into an enormous fire fountain in seconds. John
  10. All, I hope to be out at Donington with the CSCC that weekend. Forecast is hopeful, dry and some sun, but cold. Two TRs, Graham Wilson and Roy Chamberlain in my grid (Swinging 60s Race 2), with a Spitfire in Race one. Practice at 1055, Race at 1540. I have some spare tickets if you like to PM me. John
  11. TR Rob, All we need is another to repeat what RobH and I have said, and we have a Snark! ("What I tell you three times is true!")
  12. With respect, ChrysW, there is nothing worse for a TR PI engine than infrequent use, while starting and running it more often. Sooted plugs and clogged injectors are the result, as Andy has indicated. Spring is here! Time to get it out on the road! Next year, bed it down for the winter in a nice, well ventilated garage, with some fuel stabiliser in the tank and run through the engine, tyres over inflated (with a note on them to re-adjust next spring) and fully antifrozen . Leave it alone until the Spring! Have a good time! John
  13. Rob, Do you have a "pre-engaged" starter, AKA "Hi-Torque" - it doesn't look like OE equipment. Easy to tell,.t not from the angle of your photo, but the extra wires from the main starter terminal are a clue. A pre-engaged has a second, cylinder on top of (or below) the main motor cylinder, like this, from Rimmer's catalogue: The second cylinder is a servo, that throws the starter pinion at the flywheel gear ring to engage. Only after that has happened will the servo connect the starter motor, so if the servo fails (dull click) will the motor turn. If you ha
  14. But French Racing Blue, Blue de France, is a specific shade, with a "Hex triplet" which seems to be an industry identifier, of its own, #318CE7! So does Italian Rosso red (#D40000), but I suppose that German silver isn't a colour, just the appearance of sanded aluminium! John
  15. Peter,

    My paper has a small column saying that on Iceland, Katla  is NOT about to blow, but is emtting tens of thopusands of tons of CO2 daily.  1% of the UKs dialy emission.

    See https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2018GL079096   (I think - the Guardaian  didn't give a proper reference)

    Is this reassuring, about a mega eruption, or not?

    John

  16. We've had threads before about ceramic coating for exhaust pipes, and if they work or not. Well, now we the word, literally from the horse's mouth. And not just any horse, but the black rampant stallion of Ferrari. This month's Racecar Engineering features Ferrari's 2014 F1 power unit, the 059/4. It says "The exhausts swathed in thermal protection, something that Ferrari did not do for much of the season, baffling many as this lost heat ...the recoverable energy" And a picture of said swathing, not a ceramic coating, but a fireproof fibrous jacket, covered with a reflective outer su
  17. Kevin, Thank you for your enterprise and organisation you even bot us good weather - well, small drizzle after lunch but no bodies perfect! Excellent day, I enjoyed it AND the company! John
  18. Was the day's programme published before, Kev, or will it be? What's the time to turn up to get the most track time, please? John
  19. Just managed a late booking! Then, went on to browse the 'Net a little, and visit the Astronomical Picture of the Day (APoD), a favourite of mine. http://apod.nasa.gov/apod/astropix.html22/6/15 That reminds us that on that same day, 14th July, and at a UK favourable time, ten to noon, GMT (so near 11am, Summer Time), the New Horizons probe will be at its closest to Pluto. Wholly irrelevant, but another sort of excitement. I'll bring my radio, to hear the 12 O'clock news! John
  20. You know it makes sense! What's the problem, if it keeps traders - for this is a commercial venture, not a holy marque one - in contact with owners? John
  21. If this grumpy Hooray Henry Hater felt obliged to try one of these, which should he avoid? JOhn
  22. Graham. The spacer, found on top of the LH front susp.spring of US GT6s and possibly Spitfires? See: http://club.triumph.org.uk/cgi-bin/forum10/Blah.pl/Blah.pl?m-1299676321/s-48/#num48

    I heard of this before, but assumed it was a dealer-fitted mod, to cater for the, ahem, weight challenged US owner. Or was it a standard addition? Do you know which? And why?

    Thanks,

    John

  23. Neil,

    Sorry! There are almost as many John Davieses as there are Johns! Not me.

    best wishes

    John

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