916is pump and engine P/N questions

Nigel

I see nobody tried to answer this for you.  Let me explain a bit for you.

First, the A version is the standard aircraft version and is more than capable of operations up to 25,000.  The B version is a special edition for unmanned drones and has different mapping within its electronic ECU.  There are a few other special parts but for the most part they are identical.  The B is not offered to the general public, it is restricted and only available as special order.  

As for the fuel pumps the only important thing to know is the new pumps for the type 916 are the same pressure output but at a much higher volume.  This is required as the 916 has 160 HP at takeoff power and the other pumps simply do not have enough volume to feed the 916.  I believe the new pumps are much better and should be used on engines like the 915 also.  In my opinion they are better made. 

Cheers

Hi Nigel, since you got a version 2 instead of a 3, I presume you are running a fixed pitch or ground adjustable prop instead of a CS prop.  When I was doing a builder assist program, the “expert builder” wanted me to run a ground adjustable prop on my version 3 engine.  The more knowledge people convinced me that without a CS prop I would be wasting all of the engines potential after takeoff.  I have returned the first prop, at a loss of course, and swapped it for the CS version.  I’ve been told by the prop representative that the “expert” has since been convinced to change his ways and is no longer forcing his rookie builders into the wrong prop for the Rotax 916iS.

Hopefully your setup works well for you but l suspect you may be going where my original prop was sending me.  Flying a STOL aircraft, this engine/prop combination could potentially exceed VNE, but there is nothing wrong with dialing RPMs back to reduce speed and save on fuel.  

Best regards 

Thanks guys. Your answers have helped me realise I do indeed have what I hoped I'd ordered :0) 

I've only recently been given the approval from our controlling authority to go ahead and install the engine, and hope to start putting it all together in a few weeks when the engine frame has been built.

The prop will be an Airmaster electric VP so no oil controlled governor needed.

Thanks again for your guidance

Nigel