Posted by ChadS on April 29, 2008 at 11:49:24 from (66.228.96.178):
In Reply to: Re: Running E85 posted by Bus Driver on April 29, 2008 at 10:22:23:
Im still figuring out why that is on the direction of the timing, but thats what every one of em end up when tuned on the ol dyno. Ethanol, has a high octane rating,,, yes, no doubt, but even at 105 octane, it acts like 120 octane with E85 only, Id imagine E100 would be worse yet. I figure that due to the slow explosion that it creates, and its a cold explosion,, not hot like gasoline,, cyl temps are lower and the incoming air is colder, more dense. A low rpm engine, and think about this,, has alot more actual time to take in an air fuel mixture, compress, power and exhaust to make a more complete burn inside the cyl VS a high rpm auto type engine. The E85 burns longer in the power cycle, which creates a more complete burn and less emmissions, and cyl pressure is the complimenting force to regain any power loss. Easier explanation on how E85 works, is it shares alot of common conditions as LP, only not pressurized. Cooler, more densely mixed, and holds alot of octane potential. But as far as why the timing is retarded when E85 is used, I dont know just yet, thinking on the actual burn time that ethanol produces that must have something to do with it. Auto engines,,, they are backwards from what tractors engines are setup,,,,, rpm and cyl pressure, short stroke V8's will have more trouble dialing it in than an easy ol tractor engine. ChadS
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