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  #1  
Old 04-23-2014, 08:28 AM
Ex Bonanza Bucko Ex Bonanza Bucko is offline
 
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Location: San Diego, California
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Default Decalin approved?

Is Decalin approved for Rotax 912 ULS engines?
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  #2  
Old 04-23-2014, 08:53 AM
mrt890 mrt890 is offline
 
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Location: Friday Harbor, Wa
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Default Section 5

http://legacy.rotaxowner.com/si_tb_i...i912i001r1.pdf
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  #3  
Old 04-23-2014, 09:29 AM
roger lee roger lee is offline
 
Join Date: Sep 2013
Location: Tucson, AZ
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Default

Yes Decalin is okay to use in the Rotax engine. Rotax just doesn't have any real test data to offer.
I highly recommend that if you use 100LL then you should use Decalin religiously.
If you can stay away from 100LL you're far a head of the game. 100LL is damaging because of accumulation over the life of the engine no matter what. Use during cross country's are such a small percentage of most fliers total time over the life of the engine it isn't an issue, but Decalin should be used.
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  #4  
Old 04-23-2014, 09:46 AM
MLock MLock is offline
 
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Location: Salem, OR
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I've been using Decalin (at 1 oz per 10 gallons) and burning nothing but 100LL for over 600 hours in our New Blue RV-12. Lead has not been a problem. But then again, we change oil every 33 hours, purging the system plus removing and cleaning the tank. There is always an accumulation of lead in the tank.
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  #5  
Old 04-23-2014, 11:10 AM
RFSchaller RFSchaller is offline
 
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Location: Phoenix, AZ
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Mitch,

I'm curious as to how you know it's not a problem unless you've opened the gearbox to inspect. My understanding is that he gear box and clutch are the parts that most susceptible to damage.

Rich
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  #6  
Old 04-23-2014, 01:05 PM
roger lee roger lee is offline
 
Join Date: Sep 2013
Location: Tucson, AZ
Posts: 322
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If you use 100LL you have lead build up. There is no way to get around this. It just becomes a fact of life. There is no way to remove all lead. Decalin just helps reduce it. At 600 hrs. you are supposed to remove the gearbox (spelled out in the Line Maint. manual) and have it cleaned. At about 800 hrs. your gearbox clutch won't work any more because it will be packed with lead. I have seen many, it will be there. The clutch must be dismantled and cleaned to remove the lead. this can only be done at a Rotax distributor. Lead will deposit on pistons, rings, inside the gearbox and valve train parts.
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  #7  
Old 04-23-2014, 01:11 PM
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bhassel bhassel is offline
 
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Quote:
Originally Posted by MLock View Post
... we change oil every 33 hours, purging the system plus removing and cleaning the tank. There is always an accumulation of lead in the tank.
Mitch do you have a process/pictures of this process?

Thanks,

Bob
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  #8  
Old 04-23-2014, 05:39 PM
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Jetguy Jetguy is offline
 
Join Date: Aug 2008
Location: Texas, Fort Worth
Posts: 1,237
Default Rotax Webinar tonight at EAA.org!

For those who would like to learn more about their Rotax engines there is an EAA webinar titled, " Care and feeding of your Rotax" tonight at EAA.Org at 7pmct.
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  #9  
Old 04-23-2014, 05:43 PM
roger lee roger lee is offline
 
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Location: Tucson, AZ
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Lead isn't just in the oil. The burning inside the cylinders leaves deposits. The guys who fly at low rpms have far more build up.
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  #10  
Old 04-24-2014, 05:14 AM
MLock MLock is offline
 
Join Date: Jan 2005
Location: Salem, OR
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Sorry I don't have pictures of the process. A Rotax certified mechanic does just about all the maintenance work on the engine in New Blue. He just does the job with no pictures.

I did have the gearbox rebuilt at Lockwood this past January while at the Sebring Expo. They showed me the interior. There was no excessive lead build up.
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