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RobH last won the day on August 16

RobH had the most liked content!

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About RobH

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  • Location
    Newbury, Berkshire
  • Cars Owned:
    MG M type
    ex- AH Sprite
    ex- Saab 900turbo
    ex- an assortment of 'grey porridge'

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  1. This is yet another EU regulation that the UK is only now implementing. We will just have to get used to it. Garages cannot be sure where their supplies will come from so are probably labelling all their pumps just in case.
  2. No it isn't complicated - but it's not usual for the advance weights to become dislodged so something must be amiss or badly worn. Are they the right weights and springs? You said in your other thread that the dizzy was partly dismantled when you got it. I wonder why?
  3. Looks like a case for the Distributor Doctor to me Roger. You might as well get it fixed properly with the right bits.
  4. Glad you were able to fix it Pierre.
  5. This appears to be something to do with cookies and the cache. Info here perhaps: https://answers.microsoft.com/en-us/outlook_com/forum/all/i-am-unable-to-sign-into-my-hotmail-account-please/b2f4b70f-3316-4ab2-bb70-7d5a136562ad?page=15 Have you tried a different browser?
  6. Yes Pete - gap breaking down and the spark is essentially the same thing. The spark is just the rapid heating of the ionised air by the current flowing through it. As I understand it 'sports coils' are supposed to be able to supply a higher voltage and hence sustain a fatter spark. Whether that translates into better performance is going to depend on a lot of other things. It ought to if it results in better combustion of the air-fuel mixture but if everything else is standard the gain might not be noticeable. If it was a quick fix the original manufacturer would probably have done it. In answer to the last question I can only offer this which seems to sum it up well. Bear in mind the spark is just the initiation of the burn: https://performancetrends.com/Definitions/Burn-Rate.htm
  7. Sorry Dave - I wasn't trying to shout you down or anything. The gap is initially an insulator since air is non-conductive. The breakdown voltage of air at ambient temperature and pressure is about 3kV/mm and that rises with pressure so in an engine it will be more. I can't find any data on the effect of fuel mixture on that. A high enough voltage ionises the air which causes it to become conductive and current can flow. There will be some low resistance of course but negligible in comparison with suppression resistors or leads (otherwise they would never be needed ). While no current flows, resistance has no effect so the lead and suppressor resistance will not influence the voltage required to break down the gap. It's only once current flows that the suppression resistance comes into effect by limiting the peak current reached. The coil is essentially a voltage source with the voltage being proportional to the magnitude of the magnetic field, the rate of change of its collapse and the length of the conductor in the field. The coil internal impedance and the external suppression components, if any, will determine the circuit current and voltage once conduction starts. Yes as you say, an extra-wide gap might make life difficult for a standard coil but mainly because its insulation may not be adequate to withstand the voltages required. It will probably manage to generate sufficient voltage but maybe not for long. Wide gaps really need a purpose-built coil. It will be interesting to learn what P&W say once you find the notes.
  8. Are you sure the thermostat is opening fully?
  9. RobH


    The pink stuff is usually OAT (organic acid technology) which is the wrong stuff for old engines/ radiators as its incompatible with the materials used. It needs to be silicate based which is usually blue.
  10. Errrr- no. Sorry Dave but whoever told you that is a bit muddled. The resistance is there solely to reduce the rate of current rise and so minimise radio interference. Ideally you would have minimum resistance in order to get the highest spark current. The resistance will not make any significant difference to the coil voltage. That is determined by the plug gap. Until the gap breaks down, no current flows so the resistance has no effect on the rate of voltage rise. Once the gap breaks down the resistance just slows the discharge rate a little bit so it makes the spark a bit weaker but allows it to exist a little longer. Having a wider plug gap means the coil voltage is higher, which puts more strain on the insulation of the HT winding and of course on the distributor and leads. The spark energy is fixed and is determined by the coil magnetic core and the ampere-turns in the primary so the plug gap determines how that energy is expended. A wide gap will give a higher and hotter spark current but for a shorter time. A narrower gap will give a lower spark current but it will be there for a bit longer.
  11. As you say Alan, mazak gives no indication that it is near its melting point - one moment it is there and the next a puddle on the bench. You obviously have the process well under control. It is possible to soft-solder mazak, which poses less of a danger to the item but of course is not as strong as Lumiweld. Useful for filling holes and mending non-stressed areas though.
  12. They are just swaged in Roger. There was a longish thread on this a few years ago where people were trying sealing materials but I can't remember the details. A search might reveal it. Update- found them: https://www.tr-register.co.uk/forums/index.php?/topic/14802-push-rod-tubes-leaking-oil/ https://www.tr-register.co.uk/forums/index.php?/topic/47088-push-rod-tube-sealing/
  13. Sounds as though the pulley fixing wasn't tightened up properly in the first place. Is the woodruff key there?
  14. Just a point about underfloor heating in an older house Rod - it is very slow to respond because of the thermal inertia of the floor. Its good if the temperature outside is consistent but with our changeable climate I found it was never warm when I wanted it yet was always warm when I didn't.
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