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  #11  
Old 11-14-2011, 05:52 AM
PropMan PropMan is offline
 
Join Date: Dec 2008
Location: Donie,Texas
Posts: 199
Talking Additives

Quote:
Originally Posted by aerhed View Post
Once again: If you remove the alcohol, you will lower the octane rating. As stated above, car gas is rated by the RON (road octane number) plus MON (motor octane number) divided by 2. It gives you a higher octane number than an equivalent avgas rating. Detonation is not your friend. I've actually seen one engine blow the guts out of a couple spark plugs. God knows what it was doing to the internal parts. one of the actual smart guys on here may be able to give better numbers, but I wouldn't run over 8.5:1 on 90UL.
Agreed- I would not run in higher compression engines unless an adequate additive was used to boost the octane rating.
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  #12  
Old 11-14-2011, 06:20 AM
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rocketbob rocketbob is offline
 
Join Date: Jun 2006
Location: 8I3
Posts: 3,564
Default

There are a lot of old wives tales regarding mogas that are propagated by people who have no experience with it. In my 180hpC/S RV-6 I ran 87 octane with ethanol for nearly 1000 hours. I kept the boost pump on at all times.
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  #13  
Old 11-14-2011, 06:59 AM
DEWATSON DEWATSON is offline
 
Join Date: May 2007
Location: Quincy, Florida
Posts: 680
Default mo-gas

I can't find anything higher than 89 octane ethanol free gasoling around north Florida. I blend it half and half with 100LL and have no problems at all. My engine has 9 to 1 compression pistons and I would feel safe running it on 93 octane ethanol free if I could find it somewhere. You have to be careful about detonation.....it will ruin your pistons.
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  #14  
Old 11-14-2011, 08:35 AM
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smokyray smokyray is offline
 
Join Date: Jan 2005
Location: TX32
Posts: 1,891
Default It's a Gas...

Tharpo,
I ran MoGas in my 150HP RV4 for 10 years before Ethanol. I upgraded to a WD 0-320 with 10.4:1 Airboat racing pistons, rods and rings and still ran Ethanol free MoGas laced with CD3 (lead additive) and Marvel Mystery Oil. Both additives come from the Wal Mart Aviation Dept. I also ran my HR2's IO540 C4B5 on it once in awhile with no issues. My Airboat engine builder sees lots of engines come through his shop run very hard on various fuels, the most popular here being 75/25 Mogas/100LL. He said the only "blown engines" he has built were ran out of oil or submerged. A testament to properly built Lycomings.

My current RVX has a low comp 0-320 ND but runs great on MoGas, I found a local station with Ethanol Free 93 octane right now costing $3.83 a gallon. I used this site to find the location. http://pure-gas.org/

See Ya!
Smokey

Last edited by smokyray : 11-14-2011 at 08:46 AM.
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  #15  
Old 11-14-2011, 03:25 PM
Tharpo Tharpo is offline
 
Join Date: Dec 2010
Location: Hernando, Ms.
Posts: 39
Default Mo-gas..No M0-gas

Thanks to you all:
Gotta love this stuff.....real world stuff I mean. My partner already fueled the plane with a 30% av to mo-gas mixture, and he said I'm elected to do the "test flight". I decided to not go over the 150 horse threshold on the(other) four I'm building mainly because of my Scotch ancestry, but it's good to know there are like minded folks around. Sometimes, I confess, I get bogged down with analysis....did I spell that right?
Blessings
Tharpo
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  #16  
Old 11-14-2011, 11:33 PM
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Jumbo Jumbo is offline
 
Join Date: Aug 2009
Location: Muenster, Germany, Europe.
Posts: 142
Default O-320 (160 HP), 8.50:1 Pistons - Mogas no prob since 500+ hrs

Tharpo,

the RV-4 I have has the O-320 (160 HP) with 8.50:1 Pistons and me and the previous owner are running Mogas with no prob since 500+ hrs. In Germany we still have Ethanol free Mogas with an European ROZ of 98 which is ca. 94 after US specs as far as I know.

However as I am going to the UK where is no Mogas available I top up the tanks up with ca. 20 - 25 US gals Avgas every couple of weeks but I don´t think that matters really. As well I agressively lean while being on the ground and I don´t get any lead fouling on the sparks, too.

Just my 2 cents - you milage may/will vary, Heinz
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a.) Eggenfellner H-6 powered 4-seat Robin, PH-ERD 325+hrs since SEP 2008 .... counting
b.) bought flying & sold: Vans RV-4 with O-320, PH-EIL .... very sad ending - lost a friend
c.) bought flying at 51 TT: Vans RV-3A, PH-URZ .... now at 150 hrs (and having fun )

Last edited by Jumbo : 11-15-2011 at 12:30 AM.
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