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Mixing alcohol with gasoline
"Capt. Geoffrey Thorpe" The Sea Hawk @See My Sig.com wrote in message . .. "Stuart & Kathryn Fields" wrote in message .. . wrote in message ... On Mon, 09 Jun 2008 00:10:42 -0400, Sliker wrote: On Tue, 27 May 2008 20:34:40 -0700, "Stuart & Kathryn Fields" wrote: We saw an experiment where an antiqu indicated horsepower device that was used on locomotives was used and an antique hit and miss piston engine. The indicated power gage plotted piston position vs pressure and the area under the pv curve was power. With as little as 10% ethanol added the loss of power was apparent. We also tried acetone, mek and some other octane boosters. They all had the effect of reducing power. Stu Fields They had to run a test to find out that? Alcohol contains olny about 60% of the power in gas so the power loss should be quite noticable even with 10%. With E85 you are looking at close to a 40% drop. Roger (K8RI) ARRL Life Member N833R (World's oldest Debonair) www.rogerhalstead.com No we didn't have to run a test. It was just a demonstration of his engine and the internal power measurement device. I had never seen one of these devices work, so it was a interesting thing for me to observe the device in operation with different fuel mixtures. The device had a measure of resolution that surprised me. Further discussions of the technique lead to ideas of how it might be adapted to measure Hp in real time on a Lycoming. Further how might that be adapted to show sticky valves and individual cylinder problems. Stu The old mechanical systems don't do well at higher engine speeds, the signal gets attenuated - pressure tranducers, charge amps, and digital signal processing is the way to go nowadays. Kistler will modify spark plugs with a pressure tap to measure the in-cylinder pressures wihout drilling holes in the cylinder head. -- Geoff The Sea Hawk at Wow Way d0t Com remove spaces and make the obvious substitutions to reply by mail When immigration is outlawed, only outlaws will immigrate. Hey Geoff: Thanks for the tip about Kistler. I'm a retired Electronic Engineer that was mainly involved in digital stuff. The pressure pickoff was one point of interest and being able to do it without drilling and tapping the head is a nicer method. (I did drill and tap my Bultaco head for a compression release though). If we can get some of the NOW projects off my lap I would like to explore the ability to real time monitor cylinder health via a power calculations and changes thereof. BTW the Lycoming engine speeds don't bother me too much. I was the project engineer on a digital device that was running at a clock speed of 327 Mhz in the late 60's. Thanks again for the Kistler tip. |
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