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  #1  
Old 04-30-2015, 05:52 PM
edward7048 edward7048 is offline
 
Join Date: May 2010
Location: Kokomo, In.
Posts: 109
Default 100LL in RV-12

for those using 100LL in a RV-12 with Rotax 912 ULS and decalin
what ratio are you using? I have only been using 92 octane without
ethanol or 93 octane with ethanol. I am planning a couple of
cross country trips this summer and will have to use 100LL only.
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  #2  
Old 04-30-2015, 07:08 PM
Jetguy's Avatar
Jetguy Jetguy is offline
 
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Location: Texas, Fort Worth
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Quote:
Originally Posted by edward7048 View Post
for those using 100LL in a RV-12 with Rotax 912 ULS and decalin
what ratio are you using? I have only been using 92 octane without
ethanol or 93 octane with ethanol. I am planning a couple of
cross country trips this summer and will have to use 100LL only.
1/2 oz per 10 gals
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RV12 N1212K
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  #3  
Old 05-02-2015, 01:17 PM
edward7048 edward7048 is offline
 
Join Date: May 2010
Location: Kokomo, In.
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Smile 100LL in RV-12

Thanks for the information.
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  #4  
Old 05-02-2015, 01:46 PM
Top Cat Top Cat is offline
 
Join Date: May 2014
Location: Fort Mill SC
Posts: 333
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Quote:
Originally Posted by edward7048 View Post
for those using 100LL in a RV-12 with Rotax 912 ULS and decalin
what ratio are you using? I have only been using 92 octane without
ethanol or 93 octane with ethanol. I am planning a couple of
cross country trips this summer and will have to use 100LL only.
I think it tells you on the bottle of Decalin, but yes it's ? oz per 10 gals. The bottle I have has a little graduated cup next to the regular bottle cap. If you loosen the bottle a little you can gently squeeze the required amount into the measuring cup. Then simply unscrew the cap and pour into the tank.

Pour in before or after fueling, makes no difference. You might notice a little white color on the end of the exhaust pipe after you've burned 100LL a while it's the lead.

Depending on how much you use, you'd need to adjust your oil change interval and if you remove the tank to clean the lead sludge out you'll need to make sure the oil lines are purged/pressurized afterwards. Your Rotax mechanic can help you with this if you don't already know.

Check around your route there are some airfields with 93 non-ethanol on the pump but they're not always well advertised. I have one near me in SC and know of 2 in VA and one in TN. Might as well use it if you reach it?

Have a great trip!
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  #5  
Old 05-02-2015, 06:00 PM
edward7048 edward7048 is offline
 
Join Date: May 2010
Location: Kokomo, In.
Posts: 109
Default 100LL in RV-12

I think that aircraft spruce carries it. I will order some from them.
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  #6  
Old 05-02-2015, 06:49 PM
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Ghost two-six Ghost two-six is offline
 
Join Date: Apr 2015
Location: Sunny Florida
Posts: 26
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Have friend that runs 100LL exclusively in his 912 ULS. 400 hours on the engine to date without a single problem. Just has to change the oil every 30 hours or so. He doesn't want to lug Mogas to the airport and he's a big believer in supporting his local FBO.
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  #7  
Old 05-03-2015, 10:05 AM
Ex Bonanza Bucko Ex Bonanza Bucko is offline
 
Join Date: Jul 2013
Location: San Diego, California
Posts: 291
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I read on this BLOG that 1 oz/10 gallons was OK. Have you seen that? I think there is a guy on the East coast who runs his RV12 that way with really good results. I think he was/is a Van's RV12 demonstrator there.

EBB
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  #8  
Old 05-03-2015, 02:02 PM
Sink Sink is offline
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Join Date: Apr 2015
Location: Altha, FL.
Posts: 114
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100LL is 100LL even with Decalin.
Decalin only helps reduce some of the leading and should be used when using 100LL, but the lead is still there. If you can stay away from it you are far better off. It's like a person smoking. You can smoke for years and look like nothing is wrong, but eventually it catches up. The occasional use like when traveling is minor use compared to a steady diet. Lead will still build up over time in the engine. You are still relegated to do 600 gearbox inspections and do oil changes at 25 hrs. The lead can still cause valve sticking later on and lead can get under valve seats and then it has to be removed. The gearbox clutch at about 800 hrs. will cease to function properly due to lead build up. If you over use Decalin it won't hurt the engine, but it just becomes a waist and doesn't do any good after a certain amount.
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  #9  
Old 05-03-2015, 04:48 PM
aerofurb aerofurb is offline
 
Join Date: Jul 2009
Location: High Wycombe, UK
Posts: 288
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In the UK, we were limited in the use of MOGAS in certified aircraft (certified Rotax powered) due to the abundance of Ethanol.

Having maintained a number of certified 912S engines that were operated on 100LL, we never saw any issues. Same goes with many 912 powered Eurostars.

Inside a Lycoming or TCM you'll find grey sludge, so no surprise if there is some in a Rotax but - what physical damage or problems does it actually cause?

How does it actually stop the clutch from functioning? Does it slip or not slip?
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  #10  
Old 05-03-2015, 06:03 PM
MLock MLock is offline
 
Join Date: Jan 2005
Location: Salem, OR
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I've run 100LL exclusively in 912VA using Decalin at 1/2 oz per 10 gallons. Engine has 825 hours on it. No problems with the lead. Even with the gearbox inspection, no excessive lead was found in it. We just clean the tank at every oil change, 33 hours. Even with the frequent oil changes, I found that the plugs would start to load up at about 100 hours. At $2.50 each, I just change them instead of cleaning and gapping.
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