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openspaceman

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Everything posted by openspaceman

  1. openspaceman
    It was Mandy
  2. openspaceman
    I see, so the electro-hydraulic only works when the head is parked? The reason high pressure filters are not used a lot is they are very limited in their size because as this increases the bursting forces increase with the square of the dimension. A return filter is under little pressure (until it blocks which is why there is often a bypass relief) so can have a large filtering area. Scuse the poor drawing When the electro-hydraulic is not parked the petrol can be started and the shuttle moves to block the electric pump output. Similarly when the petrol pump is stopped the elecric pump provides flow and blocks the output of the petrol pump. The relief valves are safeguards should both pumps become fired up
  3. openspaceman
    I don't think flame speed comes into it very much, I think higher RON fuels has a slightly lower calorific value, it's just that the lower compression engine burns at much the same temperature but the power stroke expands from a lower initial pressure, so you get less work out of the heat put in. Conversely if you put a lower RON fuel in an engine that is designed for higher RON then as the piston compresses the fuel:air mix it may become hot enough for the fuel to ignite before the spark or, more likely, as the spark starts the combustion, the pressure and temperature from the expanding flame front detonates unburned fuel.
  4. openspaceman
    Yes @Johnsondsays the the pressure relief valve is on the (spool) block then neither pump is protected if the manually operated valves are make before break. A pressure relief valve between each pump output and tank would solve this but then you may as well put a shuttle valve where the manual valve is and let it do it automatically. The hydraulic high pressure filter is a bit unusual for this sort of use. Normally on simple 12V pumps built into the reservoir ( as on a tipper) a switch on the spool powers up the electric pump, if so this would need disabling while the petrol pump runs to cut wear on the 12V pump constantly blowing off the relief valve .
  5. openspaceman
    It keeps out the stain fungus too and strangely makes the milling better.
  6. openspaceman
    600kg of winch on the back and about half a tonne of bomford blade on the front with wheels set out to 8ft helps keep it stable.
  7. openspaceman
    Pine logs will deteriorate within one year if left lying but spray water storage meant they were still millable 4 years later after a major windblow.
  8. openspaceman
    https://www.forestresearch.gov.uk/documents/6583/FCBU117.pdf
  9. openspaceman
    'cept my 1124 has a 4.5tonne-meter grapple loader and twind 4 tonne winches Makes sense to me
  10. openspaceman
    To preserve the wood, traditionally they would have dumped them in a lake but when that's not possible they get sprayed.
  11. openspaceman
    No one has come running to buy any of my Counties and that 1474 that sold only had a few hours on the clock. Mine are a bit battered from forestry use. Rob Morgan, who breaks Counties for spares reckoned a private buyer might pay £10k whereas a professional restorer would only offer £4k. Mind I'm winching with the 1124 today and forwarding with an 1164 and grapple loader.
  12. openspaceman
    Are you sure the cylinder is unserviceable. The aluminium pick up from the piston always looks bad but after that is dissolved off the scratches in the nikasil are often not severe. Most of the wear is taken by the piston ring.
  13. openspaceman
    Yup, once the wildlife trusts changed their logos from dragonflies to badgers it was the death-knell for hedgehogs, people deliberately running them over doesn't help either.
  14. openspaceman
    Yes I suspect crank seal and probably clutch side crankcase bearing wear
  15. openspaceman
  16. openspaceman
    I see some people are deliberately adding 10% coloured water to the E10 and then syphoning off the 81.8% good fuel off the top, so the fact that it absorbs water which sits at the bottom of the tank until it's agitated only becomes a problem if it corrodes something or a globule fouls up the carb. Only the fuel tanks breathe, the storage container shouldn't so water shouldn't get in until the machine is fuelled and left with it in unused.
  17. openspaceman
    That will still be fine in a B&S mower engine sump
  18. openspaceman
    I have a distant recollection that the self mixing stuff had a bit of petrol in it already so you mixed it at 16:1 instead of 25:1. I thing 2t oil has moved on and got much better with the 50:1 oils so would mix this in with chain oil. What say you @Stubby?
  19. openspaceman
    Yes I still use mine occasionally but have to be a bit careful with it as it has started running a bit weak and I haven't got round to seeing why. The 346 I recently rebuilt is my go to saw now and any one of 3 262s which are over 30 years old now if something needs a bit of grunt. I haven't had the bigger saws out for many years, too heavy and too difficult to pull over.
  20. openspaceman
    A shuttle valve will allow either the 12V or the hydraulic pack to take the strain Shuttle valve - Wikipedia EN.WIKIPEDIA.ORG
  21. openspaceman
    Peter used to leave me the keys to his wagon so I could move it back and for on the forest road to cut down the extraction distance in the days we hand balled 1 metre pulp onto 28 tonnne artics, I used to get in such a mess that it put me off lorry driving completely.
  22. openspaceman
    My only experience was with a system for 8 flats and that was probably deemed a commercial installation, domestic may not have the same requirement. AFAIK a gas boiler heated the lot up for an hour once a day, no sense in that particular scheme at all and the flats would have been much better off with a gas combi each, probably using less gas overall too. I don't understand why heat pumps are so expensive, they are only big fridges and fridges run for years with no problems.
  23. openspaceman
    Tends to be cheap where there's hydropower, renewable too.
  24. openspaceman
    Will this kill your training business stone dead or are you expecting firms still to send people for training?
  25. openspaceman
    In fact most of the Brighton street trees produce viable seed, I know as I propagated some, and english elm, previously Ulmus procera but now Ulmus minor "Atinia" is an infertile clone. So they will be Ulmus minor I think. Ulmus minor 'Atinia' - Wikipedia EN.WIKIPEDIA.ORG I did fell some wych elm there and assisted while the lads took down the last two between the station and football stadium, they were completely healthy and showed the typical black tyloses in the previous annual rings from having contained previous infections.

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