Looks like safety wire is missing for left carb air filter.
That’s a big crossover tube. Or should I call it a pipe?
It also has two gps antennas.
OK, I'll play: Right-side carb retention spring is not attached at forward end to modified crossover tube.
Who is the supplier or seller of the oversize crossover tube?
Oversized balance tube works at a much higher RPM than the OEM one. Very smooth running at all speeds. I haven’t noticed any negatives.
When at WOT (wide open throttle) or nearly so, the potential imbalance between the two carbs is miniscule. I.E., a small difference in throttle plate position will have little if any difference in flow area of the carb throat.
I agree what you say about WOT. I am only at WOT when climbing. I cruise between 4800 - 5200 unless I am in a hurry. Descents are below that. These lower RPM’s 3000 - 5000 are where it makes a difference.
The stock tube looses its influence above 3000 RPM.
I am still skeptical, but maybe you are smarter than the Rotax engineers
That wasn’t necessary, especially from you.
MAYBE, they they had constraints like cost, average use, or a new design on the horizon 912is.
Alright, Walt... I know this isn't a discovery, because you told me about it... long ago, I'm just surprised I still remembered it.
You have lines of some sort, going from the carb vents to the back of each K&N air cleaner, much like on a Factory Rotax air cleaner box.
You'll have to explain how that's working out with the lowered fuel consumption per hour.
The hose clamp on the hose from the radiator seems to have washers under the nut, I have never seem that configuration before. Also what is the 90* pipe inside the yellow hose into the air filter?
Yup, there is that also.
The air above the fuel in now at the same atmospheric pressure as the air going into the carburetor. This is important because a difference in pressure will cause a rich or lean condition in that carburetor.
The turbulence inside the cowling causes variable pressure on that vent tube when it is left under the bowl bail.
Fuel consumption is down about 12% and plugs look much better.
View attachment 14637
The other NON Stock things are teh 1st design AS Flightlines teflon hose assemblies for the fuel sytem. These were before we made the 8m banjo fittings for th teflon hose. Nevertheless----their teflon and have no service life.
Tom
Walter---I did notice the 5.2-5.4 psi fuel pressure readings. I'm assuming this is pretty standard for you since you changed to our teflon hose package?
Tom
Just wondering out loud how close that is to fuel consumption for a 912IS motor? At least .5 gal /hr better than what I see in my RV-12.
Still running Costco Mogas? Complete with close to 10% ethanol?
I'm hoping wheel pants and weather strip will net me a bit more speed and a bit lower fuel burn.