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  #1   IP: 99.7.118.97
Old 06-12-2018, 05:08 PM
bcbristoll bcbristoll is offline
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Type of fuel for atomic4

Hey everyone just wondering what type of fuel to use in my atomic4. The downloaded manual I have suggests 90 octane....In our area reg is 87 midrange 89 and premium ~92. I've know that you don't want to use anything with ethanol but just wondering what is the best choice??
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Old 06-12-2018, 05:18 PM
Dave Neptune Dave Neptune is offline
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bcbristol, those old rating numbers are far different than todays. The 90 was an leaded regular grade of gasoline good for up to about 8:5 to 1 compression where as the new regular unleaded is good for up to 10:1.

Our A-4's are at 6.5:to 1 so finding a good fast burning fuel is problematic. Your best bet is todays regular unleaded without the ethanol if you can find it. If we could find some 83 rated regular things would be great.

You will make more HP and torque with regular fuel and such low compression. Running premium is a waste of time money and horse power.

Dave Neptune
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Old 06-12-2018, 05:38 PM
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Shell v-power currently doesn't have ethanol in Canada ( I looked up BC) that's the high octane. Here in NS there's no ethanol in high test either. I have used high test in the A4 since the ethanol came out here in the lower grades...works fine.
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Old 06-13-2018, 09:26 AM
bcbristoll bcbristoll is offline
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Thanks for the info. Just trying to be sure.
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Old 06-14-2018, 08:50 AM
Robs Hubris Robs Hubris is offline
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After using regular unleaded for years, I switched to regular leaded (more expensive, sold by marina station here in Michigan). I have noted immediate and lasting improvements in my old A4's performance. Just a happier engine.
best,
rob
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Old 06-16-2018, 04:49 PM
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I just came back from Florida where I saw a gas station (Wawa brand) that sold gasoline with no ethanol for boaters only. Thanks to all for the tips.
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Old 06-16-2018, 11:55 PM
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Thumbs up

I am in the mid-Atlantic area and there are several retailers that sell NO-Ethanol fuel. Some are roadside and some are water based.

I've found https://www.pure-gas.org/ to be an excellent resource.
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  #8   IP: 73.19.60.36
Old Yesterday, 09:03 PM
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Shilshole Marina here in Seattle has non ethanol regular. i think its 89 octane
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