
Originally Posted by
no-coast-punk
Here in the States it's been a legal mandate that all fuels contain 10% ethanol during certain months out of the year since the early 90's.
Over on that side of the pond they are phasing out Benzene in favor of Ethanol. Which is good, because Benzene is about the most toxic/cancerous shit known to man. For that reason alone it's worthwhile.
I have literally done HUNDREDS of engines to run on ethanol concentrations between 85-100%.
Personally I LOVE ethanol. All geopoliticalclimatechangesciency stuff aside.
Ethanol is an AMAZING solvent at keeping carbon off the inside of engines. High ethanol content (85% or more) engines I've done look brank new and shiney internally after 50,000+ miles. The octane rating of the stuff is VERY high. It burns cooler. Burns cleaner.
The only drawback is that yes, your mileage WILL suffer. How much is dependant on hundreds of variables. In some situations (high compression engines with a good engine control scheme for learning spark advance) mileage doesn't suffer at all.
At the end of the day 10% concentrations don't mean much. Any benefits from additional octane are negated by them using a lower grade distilate in the base fuel to hit the same octane number.
This octane number is deceiving though. You guys rate your fuel there on the RON system. RON is a stupid way to measure fuel octane and has no bearing on the modern engine. However fuel distributors like RON because it's easy to blend a fuel to hit a high RON and RON are always higher than MON. MON is really what matters. Ethanol has an EXTREMELY high MON but the RON isn't off the charts. Still with me? At the end of the day you may wind up with a fuel that has the same RON as regular premium gas... but the MON may be a few points higher. And that's what counts.
Low ethanol fuels are a good thing. Guys that have been dyno tuned to the ragged edge may see a slight hit (the bikes will run ~2-3% leaner). Stock mapped bikes will love the stuff because factory mapping is always pig rich. Really new bikes that have lambda sensors will see 0 difference with the exception of some of the cleaning properties. Plugs will last longer. You can also go a spot longer between oil changes.
You guys SHOULD be pushing for the availability of E-85. 85% ethanol. That stuff is gods gift to high performance engines. On turbo stuff the performance is similar to VP C16 leaded race fuel (116 octane, ~$13USD/gallon). Turbo engines typically see 20-30% more power without changing anything other than fuel/timing calibrations. On naturally aspirated applications performance is similar to VP MR9 race fuel ($15USD/gallon). I typically see 10-15% more torque on the NA bike engines I've done. Only E-85 is widely available here in Colorado at normal pumps. It's also about 30% cheaper than premium fuel.
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