jackc Posted October 17 Posted October 17 (edited) I have searched the Forums, but found no answer? so I am now looking for a suitable full synthetic oil to use in the Rotax 618 that I have just acquired. In looking at Penrite MC-2ST Full Synthetic Two Stroke Oil. it has a note in the specifications, as being unsuitable for ultralight aircraft So now looking for a suggested alternative? Edited October 17 by jackc Added word
facthunter Posted October 17 Posted October 17 Don't use any TCW3 type oil . Its ONLY for Outboards. ONE USA company certified it's oil for Aviation. Pennsoil I think. It's a few years back. I used Valvoline Racing 2 stroke like many others, did. Nev 1
facthunter Posted October 18 Posted October 18 Perhaps their formula has changed. ( More mixant?) Makes it seem thinner in the bottle. Nev
turboplanner Posted October 18 Posted October 18 Here's an idea; what about asking Rotax for the correct specification.
jackc Posted October 18 Author Posted October 18 I was just looking for a quick answer on a weekend so I could do my research and buy what I needed Monday in the local area 1
skippydiesel Posted October 18 Posted October 18 Rotax Owners Forum https://www.rotax-owner.com/en/rotax-forum will have all the answers. ".........note in the specifications, as being unsuitable for ultralight aircraft" Cant comment on the suitabity of "Penrite MC-2ST Full Synthetic Two Stroke Oil" however this sort of comment is often applied to products, where the manufacturer is seeking to avoid/minimise liability,should their product be implicated in an aircraft incident eg Facet Fuel pumps, widely used by the light aircraft fraternity, explicitly warns against aircraft installation/use.😈 1
T510 Posted October 18 Posted October 18 https://legacy.rotaxowner.com/si_tb_info/serviceinfo/si-2st-008.pdf Suitable oils listed in the above document 1 1
jackc Posted October 18 Author Posted October 18 9 minutes ago, T510 said: https://legacy.rotaxowner.com/si_tb_info/serviceinfo/si-2st-008.pdf Suitable oils listed in the above document Thanks, the Castrol Oils are easily available. i had picked this as a possible? https://autobarn.com.au/ab/Autobarn-Category/Shop-our-Full-Range-by-Brand-at-Autobarn/Penrite/Penrite-Hi-Per-2-Stroke-Semi-Synthetic-Engine-Oil-2-5L/p/OA00261 1
facthunter Posted October 18 Posted October 18 Oils in specific countries have varying formula's. Autobarn have a lot of brands but if you say it's for an aeroplane they might clam up. Note the date of the Rotax advice April 2009.. Some of those recommendations may have been superseded . You can call Penrite on the Phone. I've found them very helpful with Lube enquiries. They used to make a product called "Green Slime" But got sued. It required careful mixing. Aero engines operate different to most other applications. They don't get much of a rest. and they are full bore at the beginning. Your biggest worry is carbon build up in the ring grooves and the cold motor fuel washing the oil from the Internals as the fuel is not vapourised. Note also 100 L L is OK and with premix fuel remaining in the carbs will evaporate and leave neat oil which can cause lean running next time. Nev 2 1
turboplanner Posted October 18 Posted October 18 Aero engines are constant power demand (You might sit on cruise power for hours), Motor Bikes are intermittent demand, cruise is usually a long way back from max, even jetskis and skidoos are intyermittent power. So different heat input. You can email the Manufacturer's service department and most will email back the correct material within an hour or so. 1
facthunter Posted October 18 Posted October 18 Rotax are getting out of 2 strokes for Planes. I lot of the reliability is in the hands of the Operator. When they were more universal, I've seen some engines I wouldn't run as a Lawnmower,, still being flown. Little compression and rattly when pulled over. Now they are pretty RARE and there's not a lot of Real Knowledge about them. Even your off road trail BIKES NEED REGULAR SERVICING to ensure a trouble free ride. I've never had a 2 stroke even falter but I'm Very careful WHOSE planes I will fly. I will fly something a bit suss ( do a test) if there's Paddocks all around and no trees to have to climb over. Nev
BrendAn Posted October 18 Posted October 18 1 hour ago, jackc said: Rotax 618 with 99 hours TT in an X-Air Standard I use amsoil Interceptor. Full synthetic. It was the most highly recommended oil I could find in all the American forums.
BrendAn Posted October 18 Posted October 18 10 hours ago, jackc said: I have searched the Forums, but found no answer? so I am now looking for a suitable full synthetic oil to use in the Rotax 618 that I have just acquired. In looking at Penrite MC-2ST Full Synthetic Two Stroke Oil. it has a note in the specifications, as being unsuitable for ultralight aircraft So now looking for a suggested alternative? Notes about not being suitable for aircraft are just arse covering same as most ultralight stuff. 1
Student Pilot Posted October 18 Posted October 18 (edited) Used to use chain saw 2 stroke, upped the rate to 35/40 depending on plug chop from cruise. That's from a long time ago. Used in Robyn 440, Rotax's 447, 503 and 582. Memory could be unreliable 😄 Edited October 18 by Student Pilot 1
Blueadventures Posted October 18 Posted October 18 21 hours ago, jackc said: Thanks, the Castrol Oils are easily available. i had picked this as a possible? https://autobarn.com.au/ab/Autobarn-Category/Shop-our-Full-Range-by-Brand-at-Autobarn/Penrite/Penrite-Hi-Per-2-Stroke-Semi-Synthetic-Engine-Oil-2-5L/p/OA00261 Auto store or motorcycle store.
facthunter Posted October 18 Posted October 18 Do you have the Original muffler and oil bottle for the Disc valve drive ? Use the same oil there as in the premix . GL6 in the redrive is no longer available. Might need an additive. Nearly 74 HP output. Nev
BrendAn Posted October 19 Posted October 19 18 hours ago, facthunter said: Rotax are getting out of 2 strokes for Planes. I lot of the reliability is in the hands of the Operator. When they were more universal, I've seen some engines I wouldn't run as a Lawnmower,, still being flown. Little compression and rattly when pulled over. Now they are pretty RARE and there's not a lot of Real Knowledge about them. Even your off road trail BIKES NEED REGULAR SERVICING to ensure a trouble free ride. I've never had a 2 stroke even falter but I'm Very careful WHOSE planes I will fly. I will fly something a bit suss ( do a test) if there's Paddocks all around and no trees to have to climb over. Nev There are thousands of Rotax 2 smokes in service still.
BrendAn Posted October 19 Posted October 19 2 hours ago, facthunter said: Do you have the Original muffler and oil bottle for the Disc valve drive ? Use the same oil there as in the premix . GL6 in the redrive is no longer available. Might need an additive. Nearly 74 HP output. Nev How would he not have the oil reservoir for the rotary valve. Wouldn't go for long without it 😁
BrendAn Posted October 19 Posted October 19 Rave valves can carbon up and cause erratic running. That's. Another reason to use the best synthetic you can . Which is amsoil from everything I have read. 1
facthunter Posted October 19 Posted October 19 Check the Crank Oils seals also if the Motor has been sitting or a long time since manufactured. Correct Mixture is critical. Nev
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