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About john.r.davies

  • Birthday 04/01/1947

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  • Location
    Lancaster UK
  • Cars Owned:
    Race Vitesse (last in UK), Citroen C5 Tourer, GT40 kit car in construction.

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  1. Thank you, Rob! Readers of that paper may like to note the comment in the section on measurement "Aftermarket R&D" that, "This can be done in a day or two on the dyno, but is not exactly cheap. Torsiograph equipment goes for around $30,000 if you buy it, $500 - $1,000 a day if you rent it with an operator and dyno time is $1,000 a day or so. Don’t forget the price of the motor and experimental dampers and the fuel." At present, I'm glad to do these tests without charge, only asking for the owner to pay post & packaging, which is significant for a heavy damper! But it does
  2. Z320, and Rob, Just before the pandemic hit the fan, I was being helped by a member with a TR4, who agreed to let me add sensors to his car, and measure the vibration. The plan was to do so with and without the extension, and nail this controversy for good. But I regret that I have not been able to contact him again, and I fear that Covid may have got him. I have asked before if anyone else with a TR4 (or 3) would let me use in their car for this project, in the interests of scientiific knowledge! I was able to design brackets to bolt onto my collaborators car, never to test
  3. Z320, Since Torsional Vibration was the subject of my dissertation for the engineering degree I took after I retired, it's not easily condensed into a post here. So may I refer you to the article I wrote for TRaction, published in Issue 320, March/April 2020, pages 41-4? The TRR has all back issues online at https://www.tr-register.co.uk/tr-action-index, so please start there. I'm glad to explain anything that I didn't make clear in the article! John L, The 2.5L damper has a diameter of 165mm. So 1.44mm/degree at the rim. But, wouldn't it be easier to set the crank to
  4. Wow, Mike C, you have found a use for Vegemite!
  5. A further check is to remove the injectors from the inlet manifold, and hang them in a large container while you turn over the engine. You want to see that thet they produce a fine spray, not a dribble of a distorted fan of fuel. A commercial coffee tin is a good size , or else construct a trough like this, with holes for the individual injectors, that you can suspend over the inlets and see each injector clearly:
  6. Cannot the TRR have a word with Goodwood? The only race for which Triumphs would be suitable is the St.Mary's Trophy and that is now limited by regulations for cars produced befoe the end of 1965, in other words TR4 or earlier. Sporting TR4s exist, of course, but there were none in that race, although there were many (Yaaaaaaaaaaaaaaaaawn) Austin A40s See https://www.goodwood.com/globalassets/.road--racing/event-coverage/revival/2021/9-september/entry-list/revival-entry-list-2021-v3.pdf There is nothing for later TRs, let alone Spitfires or GT6s. OK, they seem to be obsesse
  7. Returning to the original clip, surely an enormous explosion, with smoke flames and bits rocketing it all directions will be edited in? Plus Mr.Cruise clinging to the front and at the last minute leaping away to be saved by the parachute he happened to have in his pocket?Otherwise it's definitely not 'Mission Impossible' material!
  8. That you get overheating at high speed suggests an aero reason. Something is inhibiting rad air flow in that situation. Anything in front that wasn't originally? Badge bars, relocated number plate? John
  9. WD40 useless as a penetrating oil - it's a Water Dispersant (No. 40 to be tried by NASA) "A dollop of copper grease at the bottom". - of the block hole, I presume. Was there a groove in the threads, to release the hydraulic pressure as it was screwed in? If no, no need to bottom, surprised they didn't all seize. A machine shop should be able to drill it out, without damaging the thread in the block. Or, WELD a bolt to the stub, if that is possible. The localised heat will help release it, much more effectively than any gas axe. John
  10. This may be proof that Gaia is doing her best to help us to help ourselves. https://www.nature.com/articles/s41586-021-03805-8 The wildfires in Australia in 2019-20 were catastrophic for several reasons. Apart from the damage to human lives and living, they released about 715 MILLION tonnes of CO2, more than Germany does in a year, for an example. But their ash was blown out to sea where it landed in the water and fed massive algal blooms by its iron rich nuitrients. Those algae absorbed about 80% of that CO2 load back into the sea. To this may be added the bloom of vege
  11. "Prices not to crazy" - couldn't find a price list, can you quote, Andy?
  12. AH! There you go, Al, done and dusted! You'll have to get under now! John
  13. Thank you, Tutor Roger, for the correction! BUT! The Shuttle's aluminium structure could not be allowed to heat above 175C(!), when some parts were heated by re-entry to 1650C . So temp differential, lets say 900C. That needed six inches of tile. A ceramic coating on an exhaust pipe is - well, I've see two thou to a millimeter (40thou) quoted. If the Shuttle needed six inches (150mm), then that thickness could make the inside and outside of your exhaust 240C different. Mega useful, if you are into F1. For a road car? And anyway, the VAST majority of the heat unde
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