Interesting video however I don't see a lot of relevance to airplane engines as I'm not aware of any Corvairs or other engines typically used in home built airplanes that have variable compression other than a possible 1% better mpg. What the video presenter does not discuss is that any ethanol added to gasoline would be subject to the 14.7% fuel air mix your ratio rather than the desired 9% for ethanol so essentially the ethanol is running lean. One benefit of the ethanol being hydrophilic is that it will mix with otter which when converted to steam expands 6000% increasing compression inside the cylinder while also providing a desired cooling effect. I remember researching that years before many of you were probably born back when there was a water injection system available through the JC Whitney catalog
Rich ________________________________ From: KRnet <krnet-boun...@list.krnet.org> on behalf of Steve Loebs via KRnet <krnet@list.krnet.org> Sent: Tuesday, April 18, 2023 11:59:51 PM To: KRnet <krnet@list.krnet.org> Cc: Steve Loebs <steve.lo...@gmail.com> Subject: KRnet> Mark's crankshafts and ethanol Mark L, I just read your page on your crankshaft odyssey. Are you, and any others using Corvair engines, still satisfied that a new billet crankshaft with good fillet radii (along with the 5th bearing and prop indexing) will eliminate the issue of broken crankshafts in Corvair aviation engines? This also got me thinking about a YouTube video about engine efficiency that I watched a few days ago. Last September, Larry F, started a thread that included the topic of ethanol. I added some info about the benefits of ethanol and included links for those interested in the science. On other lists I hear a common misconception that ethanol is "hydroscopic." That is not a word and they usually mean hygroscopic. However, that is not factual, either. Ethanol is hydrophilic. Anywho, a few days ago I watched an interesting video on the topic as it applies to engines that many of you may enjoy. Here it is: https://www.youtube.com/watch?v=6_DQPLihXfo
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