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View Poll Results: Fuel Used
100LL 110 65.09%
mixture 100LL,cargas 16 9.47%
mixture 100LL,mogas 10 5.92%
mogas 33 19.53%
Voters: 169. You may not vote on this poll

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  #31  
Old 05-16-2008, 04:02 PM
JHines JHines is offline
 
Join Date: Jul 2007
Location: Rock Hill, SC
Posts: 390
Default

Quote:
Originally Posted by airguy View Post
Not true.

Water is MORE soluble in alcohol than gasoline. Gasoline will hold a certain amount of water, just not much.
OK, I'm no chemist, should have been more specific, let me try to restate it:

Water's solubility in alcohol is sufficiently greater than in gasoline, such that, according to conventional wisdom, water in the tanks of straight gasoline can be removed to a safe extent before flight, BUT gasoline containing alcohol can/will/might hold enough dissolved water to present a high-altitude freezing problem.

Personally, I really want to use MOGAS and I hope the above statement is either not as big a concern as believed or that there is some techincal solution.
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  #32  
Old 05-17-2008, 05:43 PM
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rv6ejguy rv6ejguy is offline
 
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Location: Calgary, Canada
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Default

Gasoline does not freeze at any temperature you'd be flying at. Water entrained in the fuel could potentially cause ice to form in a line but generally only in a static state. The "frozen gas line" syndrome exists primarily in marketing schemes for those selling gas line antifreeze (methanol) for about $2 for 6 oz.

Never been a victim of this and never seen it in a car or aircraft in 30 years and down to -44C.

Never used gas line antifreeze.
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Turbo Subaru EJ22, SDS EFI, Marcotte M-300, IVO, Shorai- RV6A C-GVZX flying from CYBW since 2003- 441.0 hrs. on the Hobbs,
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  #33  
Old 05-18-2008, 08:25 AM
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frankh frankh is offline
 
Join Date: Jul 2006
Location: Corvallis Oregon
Posts: 3,547
Default Hey Ross

I never used ETOH blended fuel ...yet but the day may come soon.

Have you found any issue with the ETOH softening the proseal in the tanks?

The rest of my system is fine from a material compatibility point of view.

Thanks

Frank
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  #34  
Old 05-19-2008, 07:24 AM
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Location: Stuart, FL /Hartford, CT/Virgin Gorda,BVI
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Default proseal problem?

frank, i have been using car gas mix for over 2,000 hrs and have seen no problems. 50/50 mix in takeoff and land tank, 5/1 mix in cruize tank. it is not for everyone but if saved over 10 grand on first engine. it went 3,150 hobbs hrs. the cylinders wre in good shape, the cam lifter started making metal. sold engine and bought new thunderbolt. turbo
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  #35  
Old 07-22-2008, 09:29 PM
whifof100ll whifof100ll is offline
 
Join Date: May 2005
Location: Mandeville, Louisiana
Posts: 179
Default Octane value

OK gas whizzes, if mixing AVGAS and MOGAS, anybody know if you can consider the mixture the average of the octane ratings?

On my home airport, we have 87 octane tested alcohol free mogas we get delivered in our 500 gal tank. It is the only fuel we have on our feild. We have a well maintained delivery system with good filtration and water seperation. The 9 aircraft on me feild (including my C177) have all run this fuel for over a decade and we've had great results. My new RV-6 has an XP-360 with 8.5:1 pistons. Currently I'm only using 100LL in it, but it would be great to run a mixture of MOGAS and 100LL. Superior says it is fine to use premium alcohol free cargas. If I mixed 50/50 87 octane and 100LL, can I consider that the average of the two octane's.

Also, anybody know if the mixure will be homogenous, or will it seperate into the two types?

I don't want to ask the other members at our airport to pay more for premuim grade, as none of them need it. The plane is so much fun, I'm flying it a bunch. Costing me a fortune!!!
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  #36  
Old 07-23-2008, 09:35 AM
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frankh frankh is offline
 
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Location: Corvallis Oregon
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Default So Dale

This begs the question..What compression ratio are you running in the C177?

And if its 8.5:1 then why won't 87 octane fuel run in your RV...Vapour lock notwithstanding.

I know Rocketbob uses 87 octane in his RV...

Seems to me unless your getting detonation in your Cardinal that you don't know about then it should be perfectly fine in the RV..

Am I missing something?

Frank
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  #37  
Old 07-23-2008, 10:12 AM
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ChiefPilot ChiefPilot is offline
 
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Location: Twin Cities, MN
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Quote:
Originally Posted by lcnmrv8r View Post
I'm just curious, but how many of you guys have ever had frozen gas in your cars??? using car gas of course Surely some of you guys up north have driven in sub-freezing weather. I bet at some point most of us have driven in sub-freezing temps. Anybody ever have frozen gas?????
Good point.

From 2001 until this past May, my -6A project occupied my stall of the garage, leaving my car out in the driveway to face the brunt of Minnesota winters. Even when left out overnight when the temps dropped below -20 F, the cars ('95 Ford Probe, then later '01 Mustang) still started in the morning and ran fine - no problems.

Minnesota mandates 10% ethanol.
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  #38  
Old 07-23-2008, 12:54 PM
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Geico266 Geico266 is offline
 
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Location: Huskerland, USA
Posts: 5,862
Default

Fill one tank with 100% mogas and try it. If you have trouble switch to the other tank. My guess is there will be no issues. Make sure your FF fuel system is insulated from the heat, and the mechanical fuel pump has a blast tube on it. Sump your tanks every flying day and watch for water seperation during cold weather. I've burned over 5,000 gallons of mogas in aircraft engines.

JMHO.
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Last edited by Geico266 : 07-23-2008 at 12:59 PM.
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  #39  
Old 08-04-2008, 09:53 PM
whifof100ll whifof100ll is offline
 
Join Date: May 2005
Location: Mandeville, Louisiana
Posts: 179
Default Cardinal is 7:1

Quote:
Originally Posted by frankh View Post
This begs the question..What compression ratio are you running in the C177?

And if its 8.5:1 then why won't 87 octane fuel run in your RV...Vapour lock notwithstanding.

I know Rocketbob uses 87 octane in his RV...

Seems to me unless your getting detonation in your Cardinal that you don't know about then it should be perfectly fine in the RV..

Am I missing something?

Frank

I think you are right. The Cardinal is 7:1. I think 87 would be fine as well, just don't want to go against Superior's recommendation.

What compression ratio does rocketbob have?
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  #40  
Old 08-04-2008, 09:56 PM
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frankh frankh is offline
 
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Location: Corvallis Oregon
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Default Rocketbob

I believe is running 8.5:1 but you had better check with him directly

Frank
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