Leaded or unleaded...

[DarkHelmet]

Aviation Engines
Unit 41, Sunnyrock Park, Sunrock Close, Germiston

Tel: 011-455-4203

I bought some 500ml for R16.55 excl VAT

[Cloud Warrior]

So for a Rotax 582 with autolube I want to be using unleaded petrol and adding Super Outboard with TCW-3?

[Morph]

That appears to be the recommended oil for the water-cooled 582.

Rotax manual (Operatos Bible) states: Water cooled: Super outboard plus TCW-3 Nothing else

[Redeye]

Why use leaded fuel if Rotax recomends Unleaded-- ?? Also there is no alchohol in unleaded

[Sonex711]

Why use leaded fuel if Rotax recomends Unleaded-- ?? Also there is no alchohol in unleaded

I thought it was unleaded that had no/less alchohol. I was told to stick to leaded if not flying every day as it absorbs less water and maintains it's octane rating better that unleaded. Looks like this may not be the case. Where did you get this info from, Redeye????

[Redeye]

My old micro GURU at panorama bill anderson did a lot of research into this for his micro scool at the time- as students we had to pitch up with a 20 litre can of gas for our lesson- he only alowed unleaded- Worked for me
ever since 1200 hrs with no fuel problems-- The Rotax manual that comes with your motor also recomends unleaded and only Castrol oil -- I did use outboard oil in my 618 though

[ACE]

Hi Morpheus,

Apologies for not replying sooner - I forgot to keep an eye on this thread. I see you found BP in Cape Town and the price is similar here in Gauteng. The 20x500ml case price of R193.00 equates to 16.93 per litre. If you buy a 20 lt drum the per litre price is 13.61 - keep a few empty bottles for decanting.

You asked how long I've been using it.. all my Microlighting life. The school trikes at Springs all use it and those motors really work. I know of an ex-school Hornet Trike with a 503 Rotax that has over 1000 hours on it and to date has not been opened.

Cheers.

[PastMaster]

But out there in the Bush, Leaded will give you more push[/quote]

[IFLYHI]

I include the Rotax web site adress. They recommend unleaded unless a certain thing happens vapour lock and Castrol TTS oil






http://www.rotax-aircraft-engines.com/p ... d00286.pdf

[Sonex711]

Why use leaded fuel if Rotax recomends Unleaded-- ?? Also there is no alchohol in unleaded

I thought it was unleaded that had no/less alchohol. I was told to stick to leaded if not flying every day as it absorbs less water and maintains it's octane rating better that unleaded. Looks like this may not be the case. Where did you get this info from, Redeye????

Just managed to get a response out of Caltex

I guess I'm switching back to Caltex un-leaded...

Hi Andrew,

Thanks for the query.

From the batch fuel certificates I have on file for the fuel in the
Gauteng area coming out of the Sasol supply area, the current alcohol
levels are below 1 % v/v for both leaded and unleaded grades. The SABS
specification for unleaded allows up to 8 % v/v alcohol and up to 2 %
v/v in leaded petrol.

Provided your storage system is kept dry, there should be no quality
issues with storing this fuel for up to a month before use.

Hope this helps. Let me know should you have further queries.

Regards

Simon

Product Engineering Specialist
ChevronTexaco

[IFLYHI]

fuel in the
Gauteng area coming out of the Sasol supply area

I dont know if it still is like this, in 1985 I used to help my dad at work(bring a boy child to work) at Sasol plant Secunda, all the different oil companies filled their trucks at the same point as the Sasol trucks Deductive reasoning, after reading the above letter, tells me it is still like that.
That is why I have started to put in their "Dual Fuel" the extra octane of super and no lead for the "vapour lock"
Maybe I am totaly wrong

What is vapour lock

[Sonex711]

What is vapour lock

IFLYHI, from my limited knowledge, vapour lock occurs when bubbles form in the fuel lines. It can be caused by..
1) lines getting hot (in engine cowl)
2) High alt flying
3) fuel being sucked rather than pushed (like if your elec fuel pump on a t-bird failed and the mechanical pump has to "suck" the fuel up to the engine from the tanks causing a pressure drop in the fuel line).

IMHO, the higher the octane rating, the less likely vapour lock is - bubbles need a higher temp or lower pressure to form.

Perhaps one of the AP's on the list can give more detailed info...

[Slurp]

Hi guys,
Just a thought. Remember that the guys recommending chainsaw oil are also the guys selling spares.

Outboard oil has alow flashpoint, and cannot lubricatre as effectively.

I use TTS and Royal Purple racing. Expensive maybe, but far cheaper in the longrun!!!

[Pepper]

Slurp has a good point remember you get what you pay for I don't want to fly over dangerous mountains and worry about lubrication, in fact I don't want to worry about anything, but by using good oil I have one less thing to worry about :D :D

[kb]

I use TTS and Royal Purple racing.

Is TTS the same as Castrol Super TT 2 stroke. (in the grey bottle with turquoise label) and if not, anyone got any comments ont the Castrol Super TT???