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Av gas and Whipple.

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Old 03-28-2002, 01:54 PM
  #11
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Uncle toys .. check your P.M.
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Old 03-28-2002, 02:06 PM
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This is somewhat along the same subject. I am interested in knowing the "life" of gas these days. I have read in a previous thread that Av gas has a longer octane life than what you get from the normal gas stations, where I get mine (normally 87 octane). I don't use the hi-po fuel but am wondering how long I can get away with pump gas in my boat without having to worry about the octane level getting weak. I use the Sta-bil additive most all the time.
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Old 03-28-2002, 02:42 PM
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You must be careful with AV Gas, for a few reasons.

If you have ever spilt any you will notice that it evaporates rather quickly----reg fuel does not do this (as quickly). AV is not rated the same way as street fuel, its research octane. It does not factor in motor octane---the one that counts.
Consider that AV fuel was designed for a low rpm (1000 foot per minute piston speed), air cooled engine.
AV fuel is also know to run dry, their is also a chemical reason for this, having a fowled spark flug in the air would not be your favorite thing to happen, so AV has a chemical that disperses oil (including Marvel Mystery). All oil (even a lot of it)will be rendered ineffective by this chemical. It will be hard on rings and valve guides.

In short if your motor needs race gas, buy race gas.

RT
 
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Old 03-28-2002, 03:39 PM
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I don't know...my engine builder recommends it, I know alot of people that use it without problems, and when I was running outboards all the Merc techs recommended it. just my .02
 
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Old 03-28-2002, 04:12 PM
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Newer engines have hardened seats in the heads and will not have a problem with Av gas.
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Old 03-28-2002, 04:58 PM
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I used to use AV gas in my race car, it is a little dry, but as long as the motor is in good shape this is great stuff....
 
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Old 04-13-2002, 01:07 AM
  #17
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Hey Gary,


What was that about blowing-up a DRIVE? Av Gas umm.




That B-Max must be looking good.
 
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Old 04-13-2002, 02:51 PM
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Aviation fuel is around 108 Octane, they call it 100LL because that is considered a bare min. It does burn very dry so a lubricant won't hurt. My engine builder recommends it (he builds Pro stock NHRA drag motors), although not for this application, and I personally know individuals with 1000 SC Mercs that burn it all the time. Never heard of any problems. 100LL smells just like racing fuel.
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Old 04-13-2002, 07:36 PM
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I have been runing av gas for over five years in my boats.....I have never had a problem. Hell I run it in my aqua scooter and all the quads,the best thing about it it does not go bad after a month or two.
 
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