Posted by Don in Missouri [172.68.38.43] on Wednesday, February 22, 2017 at 10:20:26 :
In Reply to: Re: E10 Gas and Carburetor Jetting posted by Jeremy Horvath [172.68.78.49] on Wednesday, February 22, 2017 at 07:43:41 :
The octane added by the ethanol should help higher compression engines. In fact, boosting octane in today's cheap gas is really the main driving factor for ethanol blending and the reason why the vast majority of pump gas contains 10% ethanol.
The next evolution of spark ignition engines is to further increase compression ratios to gain efficiency. This is only possible with higher ethanol blends. Not sure where that optimal blend may land but it could be that a 30 or 40% ethanol blend is perfect for efficiency, power, and emissions.
Are you saying that you changed the carburetor jets to run E10.
Typical gasoline has a shelf life of about 3 months. The light hydrocarbons evaporate and the gasoline falls out of specification. In the study linked below, they found that while moisture can cause phase separation in the fuel, this happens long after the fuel has already gone bad due to evaporation of the gasoline components.
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