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Bruce Robbins

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About Bruce Robbins

  • Rank
    Well-known member
  • Birthday 24/12/1955


  • Aircraft
    Pipistrel Alpha Trainer
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  1. Hi Glen, The ends are pressed in. They can be removed if you are carefull, but I have never attempted to do so, though I have seen it done. I measure all the pushrods lengths before assembly. Assemble the heads to the barrels and torque down with NO oil in the lifters so you can compress them easily. Take note what length pushrod went you used. Push down on the rocker at the pushrod end and measure the tappet gap with feeler guages. The lifters have a working range of 3mm from memory, and I can't remember what that translates to at the tappet end. The idea is to ge
  2. Glen, It is quite a common problem. Don't risk running with little clearance. Jabiru supply two different length pushrods. Measure yours and contact them. You can also shorten the pushrods by removing the ball ends and machining the tube. I've also heard a few "clattery" Jab motors which i think have the opposite problem. Too much gap for the lifter to take up. On the last engine we did a top end on we ended up with 10 standard pushrods and 2 short pushrods.
  3. FredBBear, Jaspers Brush is closed for upgrade and will be for some time yet. Bruce
  4. Barry, Military Airspace when active is still controlled airspace. (see references quoted by ARO) So RA-AUS RPC only - No Go. RA-AUS aircraft and current PPL - Maybe. Aircraft must meet the requirements and PPL must have the airspace endorsements. R421 usually closes 12:30 Friday through to Monday morning, so is available to RA-AUS aircraft and pilots. Note that R453 is often still active on weekends, even when R421 is de-active.
  5. Hallelujah Brother. If not Oval circuit, at least the Downwind to Final turn. I believe the FAA are evaluating the proposal, or if not are being lobbied to.
  6. Jetjr, This is what I was trying to post this morning before rushing off to work.
  7. Hi Jetjr, The vane is a modified version of the cobra head fitting that attaches the scat hose to the carby mouth on a standard Jab install. They have fitted intersecting plates that run the length of the cobra head, effectively dividing the tube into 4 sections. Normally you would install the cobra head so that the outlet sits nicely in line with the outlet from the air box, keeping the scat hose run nice and straight.Because it clamps to the carby mouth you can rotate it a little either direction. jabiru cobra head - Google Search
  8. ... that's the standard Jabiru crossvane mounted at the carby inlet.
  9. Hi Jaba, We recently installed a cross vane (from Jabiru) in a roller follower J230. We found that rotating the crossvane produced large changes in EGT behaviour between cylinders. After a fair bit of trial and error we finally narrowed in to a position that gave a nice even spread in both climb and cruise. Regards, Bruce
  10. CASA plain english wording! In the Instrument the restrictions apply to Group A, which is Hydraulic Lifter (Flat Tappet) or what they called Generation 2 in the report.
  11. I have seen a Rotax 914 operating quite normally with a leaking carby bowl, but it is still possible depending on whether it's just leaking or the fuel level is too high causing flooding. I had a problem with similar symptoms on a 912 UL that turned out to be a faulty muffler. Of course that was the last thing checked, after we'd already turned the carbies inside out several times.
  12. Just to clarify, there was a flying Buzz Bomb ( R/ C), and some static models. The flying model was re-cycled, but the static models were spectacularly destroyed for the entertainment of all the big boys and girls.
  13. Classic Fighters ( this one) and Warbirds over Wanaka are similar shows, both bi- annual, but on opposing years, so there is now a top class show every Easter.
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