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  #1  
Old 11-13-2011, 04:36 PM
Tharpo Tharpo is offline
 
Join Date: Dec 2010
Location: Hernando, Ms.
Posts: 39
Default two very odd questions

My pards and I have a 160 horse RV4 ( hi-comp LYC) . We've been told, and I've read too, that it would not like M0-gas very much. Well...a local "expert" has told one of us that a blend of 30% 100LL and 70% Ethanol free 100 octane mo-gas would be alright in this engine. Looking for other's opinions.Also I saw a post the other day that said 6061-T6 lost half it's strength if welded.....anybody know what would the loss be,if any, with 2024T-3?
Blessings
Tharpo
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  #2  
Old 11-13-2011, 04:45 PM
aerhed aerhed is offline
 
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Location: Big Sandy, WY
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Default

Quote:
anybody know what would the loss be,if any, with 2024T-3?
2024 is not considered to be weldable period, and it sure wouldn't be T3 afterwards. I tried it. They're right.
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  #3  
Old 11-13-2011, 04:54 PM
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Mel Mel is offline
 
Join Date: Mar 2005
Location: Dallas area
Posts: 10,768
Default Personnally,

I'd like to know where you find ethanol free 100 octane mo-gas!
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EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
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  #4  
Old 11-13-2011, 05:05 PM
Tharpo Tharpo is offline
 
Join Date: Dec 2010
Location: Hernando, Ms.
Posts: 39
Default Ethanol free mo-gas

Sorry, Mel but it's a long way from Texas.....I live in Mississippi. I know of two stations right now.
Tharpo
My apologies....got the octane ratings twisted up.... should have been 86 or 92( if I remember correctly), but it is ethanol free.
Tharpo

Last edited by Tharpo : 11-13-2011 at 07:15 PM.
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  #5  
Old 11-13-2011, 05:19 PM
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Mel Mel is offline
 
Join Date: Mar 2005
Location: Dallas area
Posts: 10,768
Default I guess I don't understand.....

If you guys have unleaded (I assume it's unleaded) 100 octane gas in Mississippi, why are we having so much trouble finding a replacement for 100LL?
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Mel Asberry, DAR since the last century.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
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  #6  
Old 11-13-2011, 06:56 PM
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Kevin Horton Kevin Horton is offline
 
Join Date: Jan 2005
Location: Ottawa, Canada
Posts: 2,357
Default

Quote:
Originally Posted by Mel View Post
If you guys have unleaded (I assume it's unleaded) 100 octane gas in Mississippi, why are we having so much trouble finding a replacement for 100LL?
Unfortunately avgas octane ratings and automotive gas octane ratings are not measured in quite the same way, so you can't directly compare them. The same fuel would get a higher reported octane rating if it was sold for automotive use than if it was sold as avgas. So, 100 octane automotive gas would be something less than 100 if it was sold as avgas. Lots more info in this Wikipedia article.
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  #7  
Old 11-13-2011, 07:50 PM
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videobobk videobobk is offline
 
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Location: Near Scipio, in Southern Indiana
Posts: 1,779
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I have a 160 hp O-320 that was put on our 9A when it had over 850 hours on it. It was from a plane destroyed by hurricane Charlie. The owner said he had never had a single drop of 100ll in his tanks, running only 93 octane non-ethanol mo gas. I have never seen a cleaner engine, and everything about it checked out fine, and still does after about 400 more hours of 100ll. This is just a data point and not absolute, but I would not be afraid of good mo gas. I just can't find it in Indiana.

Bob
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  #8  
Old 11-13-2011, 09:50 PM
PropMan PropMan is offline
 
Join Date: Dec 2008
Location: Donie,Texas
Posts: 199
Default

There are ways to remove the alcohol, and premium gas supposedly has lower percentages of alcohol. Somewhere theres a list of gas stations that have ethenol free gas.
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RV6-N164FJ sold sadly
Legal Eagle w/Verner 3VW
Rans S7s
RV4- in progress
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  #9  
Old 11-13-2011, 10:02 PM
PropMan PropMan is offline
 
Join Date: Dec 2008
Location: Donie,Texas
Posts: 199
Default List of stations

Found IT!
http://pure-gas.org/
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RV6-N164FJ sold sadly
Legal Eagle w/Verner 3VW
Rans S7s
RV4- in progress
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  #10  
Old 11-13-2011, 10:44 PM
aerhed aerhed is offline
 
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Location: Big Sandy, WY
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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.
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