Hughes500E

My Feedback: (16)

One manufacturer says
Excessive coking in the combustion chamber, premature bearing damage etc. I am new to turbines and I just stocked up on this!


Is AS500 bad oil?

Thanks

CraigG

My Feedback: (40)

My manufacturer says you HAVE to use either Aeroshell 500 or 560 or the warranty is void. Hard for me to believe any of these aviation grade oils are going to cause harm to your turbine.

Craig

Helijet

Steve....relax. You have a P70 right. You are good to go. Been using Aeroshell for 12 years and NEVER any issues with JetCat. Still using it

Dean W.

G4guy

My Feedback: (13)

13 years of only Aeroshell 500. No problems.
Ron

stuart_80

I wouldnt worry at all if using Aeroshell 500

I work on fullsize helicopters, medium transport types (Puma etc)
We have used aeroshell 500 in gas turbines for 20 years, and also in gearboxes. Infact we have one type of aircraft that uses aeroshell 500 oil in both engines and every gearbox (3 gearboxes)

Seems a very versatile oil

Dave Wilshere

Wouldn't use it...

Mix up a litre at 5% oil/kero. Leave it for a month in a jar un-touched...it starts to separate. None of our oils were designed to mix with Kero, some mix and some sorta mix...its a different thing burning it in the combustion, than sticking it in a gearbox.
I am a mobil Jet II or BP man.
I've seen more sticky bearings (cooler ambient temps) with Aeroshell 500 too.

Dw

rcpete347

My Feedback: (251)

Been useing Aero Shell 500 from the start, (10+++) years, never a problem, but I do remix the fuel, old habit.
Rcpete

Hughes500E

My Feedback: (16)

Hi Dean, P70 and a PST J600R (but I'm really looking forward to going larger)

I'll keep running the AS500 then. I have about 8 gallons of mixed fuel that I've had stored all winter. I'll give it a check and run it through the Mr Funnel.

youngguy

My Feedback: (7)

I wouldn't run it through Mr. Funnel. I think the instructions for the funnel warn against putting through mixed fuels. You may want to check the instructions to be sure. I am working from memory on this.

marquisvns

Hughes500E,

While we are on the subject, make sure you or anyone else does not use it in KingTech engines. There's fundamental compatibility issue, not about good or bad.

In KingTech engines, AeroShell 500 will cause excessive coking far more and faster than any other oil. This discovery has been consistent since AS500 has been such a popular oil and we have a service request form for users to fill out when they send in the engine to be worked on, which will include "oil used". Dirk (our service tech) could probably chime in with his experience and observations.

Nevertheless, if you are operating other brands of turbines, the observations and results of our using of this oil in our engines may not apply.

Regards,
Barry

marquisvns

Here's a link to the thread in KingTech Turbine Clinic in reference to the topic.
http://www.rcuniverse.com/forum/m_11471552/tm.htm

Helijet

Thanks Barry for the information. I am fully aware of the differences in combustion chambers, fuel manifolds and sticks. Where one designer has found an optimum oil
( type ) / fuel ratio, it may not work in another design with the same results. The OP is new to turbine powerplants and mean't no disrespect - this is a case where reading too much on the internet can lead to confusion.

Anyway...as I tend to be asked to assist a lot of turbine modelers with all sorts of different engines - this is good information for me.

Cheers
Dean W.

DrV

My Feedback: (2)

I have been running mixed jet A/kero with as500 through Mr. Funnel past 6-7 years without any problems. But you are correct I also remember on their website something g about mixed fuel warning. It may not separate water optimally but still works for debris.

Hughes500E

My Feedback: (16)

Definitely new to turbines thus
the question I asked regarding the oil. If the oil is not responsible
for premature damage then what is?

Thanks

marquisvns

Hughes, the oil in discussion IS responsible in coking KingTech turbines. If you don't have a KingTech engine, you have nothing to worry about. If you do or plan to own a KingTech and must use turbine oil, then go with Mobile Jet II or BP products.

Thank you,
Barry

Wren Turbines USA

My Feedback: (39)

Here is what 2 stroke oil does to an NGV

marquisvns

Thank you Dean!

Barry

flejter1

Hi guys,

I'm sure AS500 is a very good lubricant as other manufacturers recommend that oil. I have noticed as repairs or 25hr interval service's come in, that I was spending way more time cleaning the carbon buildup out of some chambers and off the injectors more than others. I then started to document the trend and it always came back to AS500 as the common denominator. I just had a crashed, K-100 with 34 minutes run time on it, and the chamber had more coking in it than a turbine with 25hr using a diff brand oil.
Even though the bearings are spinning at such a high speed, Coking will build up on them and wear them out faster. I have seen the coking collect on the injectors and even grow over the tips and clog them. The coking will build up inside the chamber and can cause hot spots that will eventually make the chamber fail. I can spot an AS500 burning turbine now, without looking at the service request form, that is how big a difference it makes. Again, I don't know if other turbine service centers noticed the same trend, but on our KingTech turbines, I highly recommend staying away from AS500. The build up is the same whether you are running jet A, Kero or Diesel with AS500.

Dirk Flejter
KingTech Service

lov2flyrc

My Feedback: (24)

Been servicing many engine brands for many years, I personally have never seen any "Coking" issues that we could relate to AS500 or BP2380 oils in any of the brands we have worked on. We have seen issues with 2C oils, some Diesel fuel issues and one customer which used AS750 because he had a bunch of it. Just our experience....
All turbine oils will separate when mixed with kero/jet A if left sitting for a period, it is intended to be put in a gear box not mixed with fuel. Pour some mixed fuel in a clear jar and let it sit for a few days, separation can be seen. You should be shaking your fuel can well before every flying session.

Hughes500E

My Feedback: (16)

I really respect Barry for bringing this information to the King Tech users. I have read many positives re King Tech and the service!

I have a very strong desire to understand these concerns (almost to a fault) as my knowledge and experience increases I hope one day to have a better understanding.
I too have been programmed to find the reason/s for having to do a repair.

Amazing power plants these turbines. I have a copy of the April/May Jet International magazine. Great article on where/how it all began!

Cheers
Steve

snir2001

My Feedback: (1)

What about Mobil DTE light?
I'm using it for a few years with my P80, no problems.
Soon I will get K140 and not sure what's going to happen

flejter1

ok to use the DTE light when you purchase your K-140.

siclick33

As far as I am aware, Jetcat still do not approve Mobil DTE light even though other manufacturers do.


Ron,

I assume that your picture is showing that using 2 stroke oil is bad. I was under the impression (from the Wren website) that Castrol TT is an approved oil for use in Wrens. Are you suggesting that it shouldn't be?

Dave Wilshere

Darren

Correct on JetCat and DTE light...

Dave

marquisvns

We had mixed reports, including bearing failures on KingTech running DTE in Australia.