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Moneybox

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Everything posted by Moneybox

  1. Moneybox
    You most likely have a bit of sediment in the tank. Try opening them fully a couple of times to hopefully flush it enough to seal the contact area.
  2. Moneybox
    I've done a lot of prototype work. If you have the manpower and a simple thing like this is holding up progress it may be better to knock up a dummy one. Perhaps an hour or so for a good guy to produce a correctly dimensioned dummy allowing you to continue with other work. A couple of endplates welded to a suitably dimensioned tube and dressed in the lathe for accuracy should do the job.
  3. Moneybox
    Perhaps you were surrounded by stealthy enemy aircraft but AvTraffic had you flying blind?
  4. Moneybox
    I thought the same thing when I saw the tube ends welded but on a closer look I realised there are a couple of vertical rubber hoses connecting to the manifold. These would allow for expansion and contraction.
  5. Moneybox
    If you want a foolproof balance between manifolds use a Slack Tube Manometer. The only thing I did wrong was that I started using green coolant in the tube. It was too light with the balance well out all the fluid went up one tube. Fortunately it had a shutoff preventing the fluid entering the manifold. Once I filled the tube with Mercury it worked perfectly. Disconnect the crossover and attach one tube from the Manometer to the LH manifold and the other tube to the RH manifold. When you have balance the Mercury will be balanced. The next mistake I made was leaving the Mercury in the plastic tube. It's now badly stained. I already had one so I didn't have to buy it but this is a very cheap accurate and long life device.
  6. Moneybox
    As usual you are right Nev however they later updated to overhead valve. Morris J-Type engines are the robust, utilitarian powerplants, primarily the 1476cc side-valve four-cylinder derived from the Morris Oxford MO, used in the iconic Morris J-Type light commercial vans from 1949, later updated to the 1489cc BMC B-Series overhead-valve engine in the JB model and Austin 101 variant, known for reliability in various service roles like postal delivery.
  7. Moneybox
    I started my apprenticeship in 1969 working for Bedgood's Bakery at Paddington in Brisbane. At one point the Datson 1200 delivery vehicle overheated and cracked the head. We had an old retired Morris J-type parked in the corner. I looked at the engines and they were so similar I removed the head. All I had to do was grind a little off the bottom of the thermostat housing to clear the Datsun water pump and it fitted right on.
  8. Moneybox
    On the other hand they were smart enough to simply copy a well proved design just like the Japs did to produce some very successful post war motor vehicles.
  9. Moneybox
    An interesting scenario, the possibility of running on all four with a broken throttle cable however I think that would be an unlikely failure on a regularly serviced engine. I think you'd need to do a lot of testing before you went to the expense of making casting patterns. I've built plenty but molds but to cast a manifold is expensive. You first have to form the sand core in a mold. Then the core is fitted into the mold and the molten metal fills the cavity in between. Complex and expensive so you need to sell plenty to cover developments costs.
  10. Moneybox
    I don't have me plane here so I can't check but that thread into the manifold looks to be about 3/8"BSP so with the correct elbow threaded in a larger diameter crossover would be a simple conversion with no modification to the manifold.
  11. Moneybox
    Looks like a serious overkill. From 8mm to 1"? If there's an advantage in doing that it might be better value to just retap the existing hole on the manifold and go a little larger. Going from 8mm diameter to 15mm is more than triple the size.
  12. Moneybox
    Does anybody get the feeling we may have veered off from the theme of this thread? Some/many of the comments are getting a little to personal in my opinion. Perhaps it's time to call it quits and agree to disagree,
  13. Moneybox
    Are you saying crossing the plug wires to clear the carby jets is not a good idea? 😁
  14. Moneybox
    So nothing new there. I watched the interview in the previous video and the outcome is that any details that relate to design and chemistry remain a secret. The interesting part is that they are making outlandish claims regarding the battery charge time, lifespan and capacity. There are a lot of skeptics claiming that it must be a super capacitor however a super capacitor cannot meet their claimed capacity of 400 WH/Kg. I like to think their claims are real and we have a new revolutionary designed battery that'll make electrical energy more safe and affordable. The Australian government are meant to be investing heavily into battery manufacture but we're yet to see that come to fruition as well.
  15. Moneybox
    and it's not even April yet...
  16. Moneybox
    No doubt we're polar opposites. I'm a little casual however I operate on prior knowledge. I didn't spend a lifetime in mechanical engineering without picking up a few clues along the way. As I said before heading to Melbourne "If it starts and runs without overheating it'll make it across the Nullarbor". That doesn't mean I don't take care, I just know what I'm doing in most situations. If the vehicle was to hiccup along the way I have what it takes to sort it out so I take on things that some may find risky, for me it's a calculated risk. I'm yet to learn aviation and I'm quite aware that I'm in the high risk category where the casual approach can bring somebody to an untimely end however I've passed the last 72 years without a vehicle accident (non-competition) or serious injury so I think I have a fair chance of getting it sorted.
  17. Moneybox
    Nev I think most would understand that cool air is more dense therefore you can squeeze more into a confined space but we're talking about carburettor icing, something that Rotax seem to have less of a problem with than other engines in similar service. It has nothing to do with the fact that you brought it up even if you did appear a little rude in the manner you did so. What I'm suggesting is that Rotax may be utilising available heat to help prevent carburettor icing. If heat transfer from the airbox is the answer you'd get less heat at higher revs due to the more rapid airflow. Therefore performance at higher engine speed would be less affected. Once you reduce throttle and therefore airflow through the airbox incoming air temperature would rise effectively combatting carburettor icing.
  18. Moneybox
    Nev, it's not new. If you look back a few years at automotive engines running carburettors, later versions used water heated manifolds due to the problem created by evaporation of the fuel causing cooling.
  19. Moneybox
    You can bet these components are made to a predetermined Rotax specification or at least approved by Rotax.
  20. Moneybox
    The photo above is a snip from the Rotax website so it appears to be an original Rotax component.
  21. Moneybox
    I think you're missing the point Nev. Having the air pass through a large aluminium chamber in a hot engine bay will be introducing heated air. If Rotax wanted to prevent this they could have easily reduced the surface area of the box or it could be insulated from the accumulated heat in the top rear of the engine bay. Perhaps they intend to raise the temperature of the incoming air to prevent carburettor icing particularly at lower engine revs where the air spends more time in that chamber.
  22. Moneybox
    Perhaps Rotax did their homework on this one and thus prevented a known problem with carburettor icing by the induction of preheated air. 😉
  23. Moneybox
    I guess we'll just have to wait and see. I'm hoping they have what they claim to have because it'll not only improve safety but should significantly reduce battery cost once there's local manufacture and competition. This thread is about the Knob engine. Is the Donut engine a genuine product or just media hype as well?
  24. Moneybox
    My brother and Sister-in-law own the Cape Palmerston Holiday Village. I guess they'll be getting a good damping down at the moment. The difference between there and here is like chalk and cheese. You'll get a few inches in a good downpour. Here it can bucket down for an hour or so and we might see 10mm in the rain gauge.
  25. Moneybox
    I can't think of a better one. If you are going to draw air through an aluminium box mounted high in the rear of the hot engine bay then you are going to be feeding preheated air into the carburettors. I don't don't have the data to back that up but Skippy has stated previously his engine bay temperatures. The upper rear unventilated area is most likely as hot an area as you can find. Heat transfer is inevitable.
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