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.

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.

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,

Are you saying crossing the plug wires to clear the carby jets is not a good idea? 😁

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.

and it's not even April yet...

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.

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.

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.

You can bet these components are made to a predetermined Rotax specification or at least approved by Rotax.

The photo above is a snip from the Rotax website so it appears to be an original Rotax component.

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.

Perhaps Rotax did their homework on this one and thus prevented a known problem with carburettor icing by the induction of preheated air. 😉

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?

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.