Super Koala with Rotax 582

[Kiwi]

On 02/01/2025 at 8:22 PM, Blueadventures said:

Agree; eg cold seizure,  Hot as well.  

I know a bloke that though "if 50 to 1 is good, 40 to 1 must be better"

As you can guess, it wasn't. 

 

The two-stroke endorsement should stay.

[BrendAn]

7 minutes ago, Kiwi said:

I know a bloke that though "if 50 to 1 is good, 40 to 1 must be better"

As you can guess, it wasn't. 

 

The two-stroke endorsement should stay.

40- 1 is fine.

Forking out more money for the endorsement is a money grab.

It only needs a couple of paragraphs in the initial training to cover it.

 

[turboplanner]

33 minutes ago, BrendAn said:

40- 1 is fine.

Forking out more money for the endorsement is a money grab.

It only needs a couple of paragraphs in the initial training to cover it.

 

40-1 is not fine if the manufacture requires a different mix.

Good example of why 2 stroke requires specialised training.

[BrendAn]

4 minutes ago, turboplanner said:

40-1 is not fine if the manufacture requires a different mix.

Good example of why 2 stroke requires specialised training.

Rubbish.  Running a jabiru engine is a lot more involved than a 2 stroke.

Anyone that thinks 40-1 is bad for. A 2 stroke has not had much to do with them.

[turboplanner]

8 minutes ago, BrendAn said:

Rubbish.  Running a jabiru engine is a lot more involved than a 2 stroke.

Anyone that thinks 40-1 is bad for. A 2 stroke has not had much to do with them.

Rubbish indeed; the Jabiru is a 4 stroke engine.

We are talking about two strokes; there's a huge difference in the engineering, performance and maintenance.

I've managed to sieze a two stroke engine where the specification was 16:1 and I used 40:1; I learnt my lesson.

[BrendAn]

12 minutes ago, turboplanner said:

Rubbish indeed; the Jabiru is a 4 stroke engine.

We are talking about two strokes; there's a huge difference in the engineering, performance and maintenance.

I've managed to sieze a two stroke engine where the specification was 16:1 and I used 40:1; I learnt my lesson.

 an engine on less than half the recommended oil is not going to last long. we were talking about 40 from 50 -1 adding another 100ml to 20 lt does more good than harm.

and modern 2 stroke oils are great, plugs don't foul like they used too.

[BrendAn]

a good example is my vro johnson outboard. i have just reconnected the oil injection tank. any time you do that  the omc manual tells you to premix the fuel in the tank at 100-1 

and mark the oil tank to make sure its drawing oil for the next ten hours then you go back to straight fuel in the tank. so it runs 50-1 through the vro plus the 100-1 at cruising revs.

i believe the biggest killer of 2 strokes is overloading from incorrect prop selection. doesn't matter if its pushing water or air.

[Methusala]

Rotax Rick, a US engine rebuilder and modifier, of certain renown, reccomends 40-1 in 582's. I don't know but that's what he says. He also feels that the big end rollers starve for oil and enlarges the feed orifice on the rods. Don

[Kiwi]

4 hours ago, BrendAn said:

 

Anyone that thinks 40-1 is bad for. A 2 stroke has not had much to do with them.

Go try 40-1 in your aircraft and let us know how it went.

 

Someone smarter than me explained it like this.

 

"Aside from too much smoke and a loss of power since the oil isn't combustible like the fuel, the more serious downside is it can cause a lean mixture due to the fact that more oil added than recommended or that the carb is jetted for makes the fuel more viscous (thicker) and less of it will flow through fuel jets in the carb compared to air intake, and the result is you seize it, defeating the purpose of adding more oil which was likely done to improve lubrication to try and avoid the exact thing too much oil ends up causing, a seized top end."

 

 

Edited Saturday at 12:47 PM by Kiwi

[BrendAn]

8 minutes ago, Kiwi said:

Go try 40-1 in your aircraft and let us know how it went.

 

Someone smarter than me explained it like this.

 

"Aside from too much smoke and a loss of power since the oil isn't combustible like the fuel, the more serious downside is it can cause a lean mixture due to the fact that more oil added than recommended or that the carb is jetted for makes the fuel more viscous (thicker) and less of it will flow through fuel jets in the carb compared to air intake, and the result is you seize it, defeating the purpose of adding more oil which was likely done to improve lubrication to try and avoid the exact thing too much oil ends up causing, a seized top end."

 

 

that might be possible with a super rich mixture not 40 -1.  in the 1980's   australian built johnson outboards ran on 100-1  premix, after a few engine failures they advised all owners to switch to 50-1 with no jet changes. that is double the oil and certainly did not lean the engines out, it saved them. a friend has run 40-1 in 503 and 582s for years.  your mate had an engine failure from something besides rich oil mix.

[Kiwi]

13 minutes ago, BrendAn said:

your mate had an engine failure from something besides rich oil mix.

 

It didn't fail.

Hard to start, heaps of smoke and wouldn't rev.

I connected a tank with 50-1 and drained his carbs and it ran fine.

 

I've owned my Drifter with a inverted rotax for 23 years, and flown over 1200 hours in it, 

I'm happy with what I know about 2 stroke engines.

 

[BrendAn]

1 minute ago, Kiwi said:

 

It didn't fail.

Hard to start, heaps of smoke and wouldn't rev.

I connected a tank with 50-1 and drained his carbs and it ran fine.

 

I've owned my Drifter with a inverted rotax for 23 years, and flown over 1200 hours in it, 

I'm happy with what I know about 2 stroke engines.

 

well it was a lot more than 40-1 to do that.  1200 hours flying 2 stroke you know that.

[BrendAn]

1. THE BIG DEBATE is the 40:1 PREMIX RATIO. I been rebuilding the Rotax 2 stroke crankshafts since January 2011. Since then, I have learned a lot. Most other manufactures use 2 piling slots at the lower eye in the connecting rod to supply more oil to that prone to fail bearing. WSM, a large improvement company, builds replacement rods for the 582 engines with the required 2 oil slots. Now PLEASE understand this: every two out of three 582 engines that fail, does so in the lower rod bearing, which burns up causing the failure. Since I started rebuilding these crankshafts I have NEVER had one single 582 lower rod bearing fail. WHY? 70% of the cure is 40:1 gas oil ratio. The other 30% is due to the double oil slot.

this is from rotax rick , what don mentioned earlier.

 

[BrendAn]

On 31/12/2024 at 4:26 PM, Taraz said:

Hi Folks, Merry Xmas to everyone and hope you are all having a pleasant break.
I’m a first timer putting up a post here☺️. I’m building a Super Kola by Fisher Flying Products kit plane in Brisbane. It’s a two seater all-wood structure with a Rotax 582 reconditioned engine. I was wondering if anyone in Queensland has had any building or flying experience with this kit. When furnished it would look like this photo although this has a half VW engine on it. 
Regards

 

hi mate, would you be able to post pics and updates on the build as you go along. i and others would love to watch your progress.

did you import the kit or do they have an agent in australia. aircraft spruce?

[Taraz]

Hi Brendan, FFP was originally a Canadian company and changed hands couple of times; now owned by cod.aero. I don’t think they have an agent here and got the kit partially done from another person in Brisbane. I’m 80% there. Cheers

[onetrack]

Taraz has made a typo, that should be CKD Aero.

 

Ckd.aero

CKD.AERO

 

[BrendAn]

5 hours ago, Taraz said:

Hi Brendan, FFP was originally a Canadian company and changed hands couple of times; now owned by cod.aero. I don’t think they have an agent here and got the kit partially done from another person in Brisbane. I’m 80% there. Cheers

don't forget some photos. 👍

[Student Pilot]

On 5/1/2025 at 1:44 PM, Taraz said:

Hi Brendan, FFP was originally a Canadian company and changed hands couple of times; now owned by cod.aero. I don’t think they have an agent here and got the kit partially done from another person in Brisbane. I’m 80% there. Cheers

80% there and 90% to go 🤣 The details take a lot of time to finish a build.