87octane 10%ethanol for Rotax 912ul

[don Freimark]

Rotax operator Manual says 87 Octane is ok for the 80hp 912,nothing is said about 10% ethanol.I would like a general consensus from current owners. Thanks

 

[Capt. Geoffrey Thorpe]

I run whatever comes out of the pump at the corner gas station. Nary a problem over the last 10 (?) years.

If there is an issue it will be with the stuff upstream of the engine. A buddy ran "aviation quality" fuel lines in his Kitfox - lost power on takeoff because they had swelled up internally. I use SAE spec. fuel lines.

 

[don Freimark]

I run whatever comes out of the pump at the corner gas station. Nary a problem over the last 10 (?) years.

If there is an issue it will be with the stuff upstream of the engine. A buddy ran "aviation quality" fuel lines in his Kitfox - lost power on takeoff because they had swelled up internally. I use SAE spec. fuel lines.

Fair enough.Im being overly cautious-trolling for any 'bad' expriences-havent found any.In Brazil engines torn down after using 25% ethanol found to be spotless. Thanks for the reply.

 

[Llewtrah381]

Take a look at 5.1.1: https://legacy.rotaxowner.com/si_tb_info/serviceinfo/si-912i-001r3.pdf

You’re good to go

 

[don Freimark]

Take a look at 5.1.1: https://legacy.rotaxowner.com/si_tb_info/serviceinfo/si-912i-001r3.pdf

You’re good to go

Thank you. I bookedmarked it,to be studied. And at a future date I plan to remove the the Evans waterless coolant and replace with recommended 50/50 coolant. right now im trying to eliminate strobe radio interference starting with removing negative 'ground loop',next will be the on/off switch isolated with nylon washer. thanks again

 

[Samuel Seidel]

I ran premium ethanol fuel in my Rotax ULS with automotive grade fuel lines.

 

[don Freimark]

I ran premium ethanol fuel in my Rotax ULS with automotive grade fuel lines.

I ran premium ethanol fuel in my Rotax ULS with automotive grade fuel lines.

thanks for the info. I started to use 87 octane -10%ethanol-ok per Rotax,Lockwood aviation and several owner/pilots.

 

[MonkeyClaw]

I'm curious what altitude and temps you're flying at. I live at ~4500' and the temps can easily reach into the 90s.

 

[don Freimark]

I'm curious what altitude and temps you're flying at. I live at ~4500' and the temps can easily reach into the 90s.

 

[don Freimark]

Im guessing 180-190 coolant.Im about to install a in line water coolant gauge as my current temp gauge is in error-showing245.thermo heat gun on radiator shows 170-175inlet 140on the radiator outlet. Milwaukee,wisconsin ... all F not C

 

[Capt. Geoffrey Thorpe]

I'm curious what altitude and temps you're flying at. I live at ~4500' and the temps can easily reach into the 90s.

Sea levelish (600 msl) airport - temperatures in the 80s are typical in the summer, 30s in the winter. Don't fly a lot at higher altitudes, but have not had any issues. I will also note that the original builder did not install a fuel return and I have left that part alone. I have an electric fuel pump but don't generally use it. Gravity + engine driven pump seems to do the job. And, I would note that everything is pretty open under the cowl and I generally run on the cool slide.