premature engine failure at 400 hrs

The Jabiru Engine which is used in many other aircraft.

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IWG
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Re: premature engine failure at 400 hrs

Unread post by IWG » Mon Jan 14, 2019 1:38 pm

Hi Foxdog

Seeing that you are also a Mogas friend, you have the advantage of beeing able to use
part synthetic oil.
This reduces carbon buildup drastically and you will be surprised how clean the plugs stay.
I have done so for the last 220 hours and even the valve heads show almost zero buildup.
Before changing to Mogas the Aeroshell 100 in my engine turned blackish grey in 10 hours,
nowadays the oil looks almost new at the yearly oil change and I have had no more rough
idling or hiccups

IWG
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Re: premature engine failure at 400 hrs

Unread post by Flooi » Mon Jan 14, 2019 2:15 pm

IWG wrote:
Mon Jan 14, 2019 1:38 pm
Hi Foxdog

Seeing that you are also a Mogas friend, you have the advantage of beeing able to use
part synthetic oil.
This reduces carbon buildup drastically and you will be surprised how clean the plugs stay.
I have done so for the last 220 hours and even the valve heads show almost zero buildup.
Before changing to Mogas the Aeroshell 100 in my engine turned blackish grey in 10 hours,
nowadays the oil looks almost new at the yearly oil change and I have had no more rough
idling or hiccups

IWG
This is most informative.... how long can u store it? If one flies little, the mogas in tanks will
lose octane??? 😳
Hennie van Zyl
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Re: premature engine failure at 400 hrs

Unread post by foxdog » Mon Jan 14, 2019 6:24 pm

Hi IWG,
What is the oil that I should use that is part synthetic,
Regards Foxdog
IWG
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Re: premature engine failure at 400 hrs

Unread post by IWG » Tue Jan 15, 2019 10:32 am

Hi Foxdog,

If you use Avgas as an occasional backup only, you can run on Shell HX7 (10W-40).
When I use no Avgas at all, I found Shell HX8 to run even cleaner.
The other Part Synthetic/ Full Synthetic oils probably work as well, the Jabis are after the "40" viscosity.

IWG
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heisan
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Re: premature engine failure at 400 hrs

Unread post by heisan » Tue Jan 15, 2019 10:57 am

IWG wrote:
Tue Jan 15, 2019 10:32 am
If you use Avgas as an occasional backup only, you can run on Shell HX7 (10W-40).
I would be very wary of using non-approved engine oils. API/SN is not recommended for air cooled engines...
Justin Schoeman

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IWG
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Re: premature engine failure at 400 hrs

Unread post by IWG » Tue Jan 15, 2019 1:24 pm

Good point Heisan,

I have been pursuing this subject since 2007 and with the help of various oil experts
have made a list of lubricants suitable for applications under extreme conditions,
one was to operate a Cheetah with the J2200 engine in RiYadh, Saudi Arabia.
The final conclusion was, the 10W-40 SN type oil exceeds all requirements for the J2200.
It is however not suitable for many motorcycles aswell as Rotax 912/914 engines, as these
have gearboxes and clutches lubricated by the engine oil.

IWG

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