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Red

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Everything posted by Red

  1. Red
    Jab engine?, I had terrible RF interference on mine tried lots......Shielded P-Leads, new coils, Magnecore ignition leads, ferrites all over the place.....and finaly the thing that worked was resistor plugs. I actually chose Iridium Resistor plugs as I thought I made loose a bit of oomph with the resistor and the finer iridium tip might regain some of that loss back...anyway all 5s on the Radio after that. edit.Now I think about it I also tried a new regulator and Capacitor which made no difference, spent loads chasing that one
  2. Red
    Sigh....Its there to simply fill voids with something more heat conductive than nothing (there are many many voids in the crudely machined threads of a spark plug) Go tell the many people who fried their CPU because they forgot to apply thermal paste that it doesnt work This https://www.aircraftspruce.com/catalog/cspages/silheattrans.php is not the same thing as silicone sealant
  3. Red
    Like the one Im racing in my profile pic?🤣
  4. Red
    Burnie, It's my understanding that the water cooled heads fitted to 912 engines are so efficient at cooling that there can be a greater temperature gradient between the plug and head than most other engines we use, the heat transfer paste helps reduce this temperature gradient. I'm not going to advise on whether its use is warranted or whether Rotax know whats good for their engines🙃
  5. Red
    Back to the purpose of this thread..... a year or so ago I found that the engine mount rubbers for the Jab engine were actually an old Aussie car part and as a friend was currently over there I had him get me some, it was far far cheaper than going through the UK dealer for Jab (their prices for most things are beyond a joke) here is the part.......
  6. Red
    As I said, Rotax insists its about heat transfer not anti seize, apparently they consider that an important factor in their engine.
  7. Red
    The whole point (according to Rotax) is for heat transfer purposes.
  8. Red
    Splendidly handled...get that pilot a drink
  9. Red
    There used to be a VGS (RAF run Volunteer Glider Squadron) at my home base that used those Grobs to give Air Cadets air experience flights they had Limbach 80 hp engines making them rather underpowered for their weight, a go around with rising terrain to contend with would not be a good situation in one of these and could well lead to a stall (not saying this is what happened here just proffering a possible scenario)
  10. Red
    25 gusting 30 winds even if only a few degrees off in a small taildragger is not an easy task. I wouldnt like to criticise as I only have about 200 hours in taildraggers, but in my opinion they werent the type of conditions you should be trying a 3 pointer in a light tailwheel aircraft or using as much flap as he had in
  11. Red
    https://www.carmoelectronics.co.uk/index.php?main_page=product_info&products_id=2276 I know one Bloke who fitted this one with a Lithium Battery, he's had it about a year or so and reports no problems so far One thing that puzzles re: Rotax 912 with Lithium...as far as I know all the Lifepo4 12v batteries have onboard regulation to deal with a motorcycle regulator's output (I've had one on my motorcycle for 5 years now with no trouble...so considering the Rotax 912 uses a motorcycle regulator, shirley there should be no problem?
  12. Red
    I'd borescope that engine before even thinking about buying it
  13. Red
    Just one flat whilst training( it became apparent that the outfit let tyre and brake wear get real bad before changing them out), this was at an airport with a mix of Tarmac and concrete runways. In the 15 years of flying since I've not had one, flying has been 90% grass runways and except for some of my Biennial reviews has been in my own owned/operated aircraft that I do my own maintenance on
  14. Red
    Thats a not very well done Photoshop
  15. Red
    A-51, at the risk of sounding like an idiot (yeah I know..again)😁 Is there something Incoming I missed?
  16. Red
    Stretching/failing studs? Are you confusing 2 different engines here? or just mixing 2 subjects in one reply again (Jab through bolts stretching/failing and Rotax cranks spinning)
  17. Red
    You replied to 2 different posts from 2 different posters, in that single reply, gets confusing for readers. Can you try and make some indication of who you are replying to in your posts (most use the quote function) Thanks☺️
  18. Red
    My point is that it doesnt wholly rely on through bolts to keep the cases shut they have sensibly placed bolts around the edge of the case and dont rely on overly clamping the central mass where the mains reside just to stop the case leaking or fretting. Whats your theory on it Nev?, I'm sure you have one Edit..sorry thread drift🙃
  19. Red
    Mine did that and it was low hours it's supposedly common. My theory was that the torque required to clamp the cases using just the through bolts is so high that when the aluminium cases expand (expands more than the steel through bolts expand in length) the case clamps down on the mains. Noticeable that on something like a Continental engine the cases are held shut at the case edge by multiple bolts and don't exhibit this problem.
  20. Red
    Yea, the limiting factor on 912 series is the crank rigidity, its a multi piece pressed together crank and too much torque will twist it. This is what governs the allowable boost on a 914 for instance though the Rotax limits are very conservative for arse covering reasons (there is a little dongle that can be purchased for the 914 that allows a higher boost , dubious legality )
  21. Red
    I must be wrong about the F650 rotation as the rotax starter is ccw so if the same starter fits an f650 then it too must be ccw, apologies for wrong reading of the F650 setup, though I still cant see it, must be something hidden in the gear train
  22. Red
    There are a few factors, firstly the f650 starter is actually 180 degrees different in orientation to the 912 and there are 2 gears between it and the sprag. who actually lists the starter as ccw? http://faq.f650.com/FAQs/Photos/TransmissionPhotos/269-Alternator.jpg
  23. Red
    The oils I use meet or exceed the makers spec, which of course is not the same as "recommended" which is far looser term often influenced by factors quite apart from efficacy
  24. Red
    I've always used any semi synthetic motorcycle oil that was up to spec (most exceed spec) and happened to be available, I dont put much store in the various claims of superiority the competing companies make they all have to pass the same tests for quality and performance Just my opinion, I have others😁
  25. Red
    Looking at workshop drawings for the F650 engine and noting the gear arrangement between starter and sprag clutch the starter motor will have clockwise rotation
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