Decalin use in a unleaded mogas - Avgas mix
Moderator: drseti
Decalin use in a unleaded mogas - Avgas mix
I just purchased some Decalin to use in my Rotax 912. I always use premium unleaded when it's available, but will be using the Decalin on longer cross-country flights and using 100LL. If I have a 20-Gal tank with 10 gallons of premium unleaded in it and I add 10 gallons of 100LL, should I use 1/2 oz of decalin for the amount of 100LL added or one ounce for the full 20 gallons in the tank?
Re: Decalin use in a unleaded mogas - Avgas mix
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Last edited by MovingOn on Sat Aug 16, 2014 6:24 pm, edited 1 time in total.
Re: Decalin use in a unleaded mogas - Avgas mix
That's what it says on the bottle and I would tend to agree logically. If you always add Decalin this way to a tank that only contains 100LL, then the concentration would always remain constant with respect to the amount of lead in the tank. However, if there is mixing of 100LL and 91 octane, then the concentration would be diluted (e.g. by the 50:50 mix in my example). Not sure if that's important.
Re: Decalin use in a unleaded mogas - Avgas mix
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Last edited by MovingOn on Sat Aug 16, 2014 6:24 pm, edited 1 time in total.
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Re: Decalin use in a unleaded mogas - Avgas mix
I suppose it depends on the chemistry of how it seeks out and attaches to lead. I wouldn't venture to even guess.
Decalin Chemicals has a contact page on their website. I would think that they could give you much more informed guidance than anyone here.
http://decalinchemicals.com/contact-information/
Do pass along any feedback you get, though, please.
Decalin Chemicals has a contact page on their website. I would think that they could give you much more informed guidance than anyone here.
http://decalinchemicals.com/contact-information/
Do pass along any feedback you get, though, please.
- Bruce
Re: Decalin use in a unleaded mogas - Avgas mix
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Last edited by MovingOn on Sat Aug 16, 2014 6:23 pm, edited 1 time in total.
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Re: Decalin use in a unleaded mogas - Avgas mix
My apologies to any Chemistry PhDs on here.MovingOn wrote:There are people here who know. It's a common issue for LSA.
- Bruce
Re: Decalin use in a unleaded mogas - Avgas mix
If I add 100LL to my fuel even though I may have 91 oct. in it I just add my 1/2 oz.( per 10 gal) Decalin whether it needs it or not. Why nit pick over 1/2 - 1 oz. It won't hurt anything. I'm usually adding 10-20 gals to top off any way.
Roger Lee
Tucson, Az.
LSRM-A, Rotax Instructor & Rotax IRC
(520) 574-1080 (Home) Try Home First.
(520) 349-7056 (Cell)
Tucson, Az.
LSRM-A, Rotax Instructor & Rotax IRC
(520) 574-1080 (Home) Try Home First.
(520) 349-7056 (Cell)
Re: Decalin use in a unleaded mogas - Avgas mix
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Last edited by MovingOn on Sat Aug 16, 2014 6:37 pm, edited 1 time in total.
Re: Decalin use in a unleaded mogas - Avgas mix
I tried emailing Decalin Chemicals this AM before posting here, but their web pages weren't coming up for some reason. Contact link seems to be working now, so I just sent off the question to them. I'll post their reply when I hear back from them.
Re: Decalin use in a unleaded mogas - Avgas mix
I'm no chemist, but I would add the Decalin in ratio to the 100LL being added per their instructions. The fact that you are adding the 10 gallons of 100LL to 10 gallons of unleaded doesn't change anything. You still have 10 gallons worth of lead and the correct amount of Decalin to remove it.
Re: Decalin use in a unleaded mogas - Avgas mix
Decalin can be used from 1/2 oz to 2 oz. per 10 gal of 100LL
Roger Lee
Tucson, Az.
LSRM-A, Rotax Instructor & Rotax IRC
(520) 574-1080 (Home) Try Home First.
(520) 349-7056 (Cell)
Tucson, Az.
LSRM-A, Rotax Instructor & Rotax IRC
(520) 574-1080 (Home) Try Home First.
(520) 349-7056 (Cell)
Re: Decalin use in a unleaded mogas - Avgas mix
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Last edited by MovingOn on Sat Aug 16, 2014 6:36 pm, edited 1 time in total.
- FastEddieB
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Re: Decalin use in a unleaded mogas - Avgas mix
I'll join the chorus of "I don't know", but...
...it was always logical to me to add Decalin in proportion to the amount of leaded fuel added.
So that's how I've always done it.
...it was always logical to me to add Decalin in proportion to the amount of leaded fuel added.
So that's how I've always done it.
Re: Decalin use in a unleaded mogas - Avgas mix
Thanks all for the feedback. Just letting everyone know...Decalin never responded to the question.