November 21st, 2017, 11:51 AM | #1 |
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Name: Dustin
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Fuel
Okay so it's something that I have been wandering for a while because I know that ethanol eats away at the carb how bad of an idea would it be to run 93 octane in a 250cc engine
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November 21st, 2017, 11:55 AM | #2 |
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It wouldn't make any difference, other than running slightly richer if it's non-ethanol gasoline.
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November 21st, 2017, 12:41 PM | #3 |
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You may actually lose power if running higher-than-designed octane fuel. This has been dyno-proven endlessly. You'll want to run lowest octane possible that doesn't cause knocking/pinging. These newgen bikes actually has lower-compression than previous pregen engines, and those run just fine on 87-octane.
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November 21st, 2017, 12:55 PM | #4 |
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What makes you think 93 octane has less ethanol in it?
(This may vary by location IIRC... here in Connecticut everything except race gas has ethanol.)
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November 21st, 2017, 01:04 PM | #5 | |
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November 21st, 2017, 01:31 PM | #6 | |
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Quote:
I think dyno-comparisons I'm thinking of is +10yrs old on carb engines. NA engines make max-power around 13.5:1, richer or leaner on either side tends to drop power. The difference in AFR with running richer would account for loss of power. The primary octane-boosting hydrocarbon in higher-octane fuels is toluene which has higher specific-gravity than 87-octane gasoline mix, which causes richer mixtures. If Dustin is worried about ill-effects on carbs, he should be looking more at RVP-Reid Vapour Pressure rather than Octane properties of gasoline. The winter-blends of gas tend to have higher RVP for easier evaporation and lower emissions. This causes gasoline sitting around to dry out faster and clog carbs easier during winter storage. Using some additives like Stabil-360 is a simple fix. |
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November 21st, 2017, 01:51 PM | #7 |
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It can be toluene, xylene, benzene, and others, in any combination they feel like using at the time.
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November 21st, 2017, 02:09 PM | #8 |
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November 21st, 2017, 02:32 PM | #9 |
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November 21st, 2017, 03:03 PM | #10 |
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I'll have to ask a friend of mine about it next spring at the 2-stroke meet. He works at a refinery in Louisiana, and is up on all the refining and distilling and blending of stuff.
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November 21st, 2017, 06:32 PM | #11 |
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Here in Iowa I can get ethanol free 87 and 91. It varies from station to station a bit.
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November 21st, 2017, 11:43 PM | #12 |
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November 22nd, 2017, 04:04 AM | #13 |
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Yeah, take denatured alcohol for example. It's basically ethanol (booze) mixed with methanol (wood alcohol). Why is it mixed with methanol? So you can't go to Home Depot and buy it to make drinks. Why, because our legislators would rather blind us, put us in a coma or kill us rather than lose a single penny in liquor taxes.
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November 22nd, 2017, 08:17 AM | #14 |
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I would say use the lowest octane you can get that doesn't contain ethanol.
Or you could try the Stabil additive designed to neutralize the effects of ethanol. 87 without ethanol will give you the best performance and economy in a stock Ninja 250 if you can get it. I believe having excessive octane can lead to incomplete combustion and additional carbon build-up in the combustion chamber. It can also lead to hard starting in some engines. In a carbed engine, gas with ethanol will produce a leaner mixture than gas without, so running ethanol-free gas can make a carbed engine run better (richer) if it hasn't been tuned. |
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November 22nd, 2017, 09:14 AM | #15 | |
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Quote:
- Fuel detergents will protect against intake valve deposits - Anti adhesion compounds prevent fuel detergents from forming a sticky film on intake valves - corrosion inhibitor helps prevent rust in the fuel system - demulsifier helps prevent water from accumulating in your gas tank allowing it to be separated and removed I believe less expensive gasoline may not contain these added benefits. Bill
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November 22nd, 2017, 09:23 AM | #16 |
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I may be wrong, but I think you're referring to so called "top tier" gasoline brands, as opposed to "premium" that means high octane. For example, all Chevron gasoline contains Techron, regardless of whether it's regular or premium.
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November 22nd, 2017, 10:22 AM | #17 | |
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I didn't know Chevron gasoline contained Techron. Makes sense since Chevron manufactures Techron. I use it in my auto 2X/year and a few ounces my bike 1X/year. A friend of mine swears by the stuff. Bill
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November 22nd, 2017, 10:31 AM | #18 | |
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I absolutely don't expect it to work that way on every dirty carburetor, but that bottle was worth the price for the time and effort it saved me on that one job. |
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November 22nd, 2017, 10:46 AM | #19 | |
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Cheers, Bill
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November 22nd, 2017, 11:14 AM | #20 |
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Adding Techron (active ingredients PEA) increases detergent cleaning ability significantly more than what’s in Chevron gas. So if you’re going to be adding it, really doesn’t matter what gas you get. Other cleaner that has high dose of PEA is Redline SI-1.
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November 22nd, 2017, 12:35 PM | #21 | |
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You are way ahead running a tank full of a strong fuel system cleaner (like Chevron Techron Concentrate - 1oz per gal) once every season than buying Premium gas thinking it's keeping the engine cleaner. |
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November 22nd, 2017, 10:29 PM | #22 | |
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November 23rd, 2017, 07:11 AM | #23 | |
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November 23rd, 2017, 09:08 AM | #24 |
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Has anyone ever done an experiment with this? not the official studies, but their own 8th grade science experiment, where you have some fun.
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November 23rd, 2017, 09:47 AM | #25 | |
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I could care less about cost of fuel for the cycles as well, but running Premium (if it's not necessary) is giving you less performance and economy - even if the cost was the same as Regular. |
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November 23rd, 2017, 10:19 AM | #26 | |
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Bill
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November 23rd, 2017, 10:44 AM | #27 | |
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Bill
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Insanity: doing the same thing over and over again expecting different results each time. |
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November 24th, 2017, 08:01 AM | #28 |
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November 24th, 2017, 08:06 AM | #29 |
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Ram Jet
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