I went to LHS today to get fuel of high nitro and castor oil since
my Norvel .061 engine needs it, but they didn't have one in stock
and the shop owner said "the story small engines require caster
oil is out-of-date, now high percentage synthetic oil can take place
of caster oil".
I could have ordered castor fuel if I wanted, but I bought one of
26% synthetic oil / 30% nitro.
I like synthetic oil because it is more dry than castor after run.
I will use it for my Norvel .061, but has anybody ever used sunthetic
oi fuel for any mini engine? Thanks for your info.

Tsutomu Mabuchi

Tsut; He`s wrong. Read this page, http://www.norvel.com/t002.html

You need some Castor oil in that fuel..You can use that fuel,you bought, but it`s not recommended ..If you run lean you risk damageing the engine.add some castor oil yourself to that fuel to be safe..

Thanks for the suggestion.
I wanted to know most is there is any other difference in other than
temperature and rust, for example smoothness in running or engine
longivity.
Castor always makes engine and throttle valve stick in a certain period
so I would like to use high synthetic oil content fuel taking care of heat
and rust if there is no problem in other than those.

Tsutomu Mabuchi

IMHO, you can safely use your synthetic fuel without worry.
In Sweden, where I live, most people use synthetic oils exclusively with no castor oil addition, be it small or big engines.

Unless you run your engine lean for extended periods, the chances of damaging your engine approaches zero.

Irrespectively of the oil used, when using high nitro fuels it is always a good idea to use some kind of after-run oil in order to prevent corrosion.

/Red B.

The thing with Castor oil is ,that it is cheap insurance, for those times, when things go wrong.It`s a personal choice.I won`t run an engine, without at least some castor in it. Usually, I like at least a 20% total oil content, and 50% ,of that amount ,being castor..Here`s a chart of some testing I did, with varying amounts of head shims ,Nitro,and ,prop sizes..The test engine is a New Norvel BigMig 0.061" with only 2 ounces of fuel, through it ,for the initial break in..With the Break-in ,and, the testing shown on the chart, I`ve only ran a total of 10 ounces of fuel through it since New..I`ve not run the engine since.The fuel, with the least ,amount of Castor, was the Morgan Omega Fuel..If you look at the Chart you`ll see some pretty high RPMs shown there 20,000 Rpm+ ,and naturally, the higher the Revs, the Higher the Temps.I had no way to measure the heat generated, but wish I did..I`m curious to know those numbers too.I`m not trying to tell you guy`s what to do, except that Castor oil will protect, and lubricate your engine,at temperatures, that the Synthetic oil will not..It`s up to you ,to decide if it`s more important, to have a clean plane ,Or ,a well protected engine, in a Oily plane.Unexpected things happen,and parts, for the Norvel engine are getting hard to get , around here in North America. What is the Availability ,of the Norvel engines and their parts like in your Countrys? are they easy to get ahold of? ... Dave

Red B. and D Bronk,

Thank you for advice.
Conclusion is that I will add some castor to my fuel.
Norvel engines are also not available in Japan now and I got my Norvels
at ebay recently. Of course I have no parts in stock even a new plug.
I hear that high nitro fuel makes the same power with richer mixture
than low nitro fuel, so I thought I could use it for that purpose, to keep
the mixture rich. It's more difficult to find good mixture in synthetic fuel
than castor fuel, but I thought I could do it by setting the needle a bit
less rpm from the peak.
I use 100% synthetic fuel for all my engines now, from .10 2 stroke to 1.20
4 stroke and it is not difficult to set mixture rich, however I will treat Norvel
engines with special care. I prefer oily airplane in this case.

Tsutomu Mabuchi

TSU; you should go over to the 1/2A forum,for some discussion, on the Norvel engines.There is a solution, for the Hard to Get ,Glow plugs for these Engines.Where you can make your own .Another fellow from Japan ,shows up there sometimes ,too..DAVE

Thanks, I will visit there.

Tsutomu Mabuchi

D Bronk,

I should say we may use all synthetic oil fuel for Norvel engines at least in the field of
lubrication unlike Cox or VA which still need castor fuel.
Thanks.

http://www.rcuniverse.com/forum/m_37...tm.htm#4586511

Tsutomu Mabuchi