I have researched this, and the 6 cylinder subaru is an horozontally opposed engine same as a Lycoming. It was designed by subaru for an aircraft. The aircraft did not take off financially so they addapted the engine for a car. Eggenfellner then converted it to an aircraft engine. This is not the same as the 4 cylinder Subaru engine that they used to use.
Dan ----- Original Message ----- From: "Scott William" <[email protected]> To: "KRnet" <[email protected]> Sent: Monday, October 17, 2005 7:37 PM Subject: Re: KR> Eggenfellner engines > Dan: > There's a reason Eggenfellner calls them > "conversions". They weren't designed to fly....now or > ever. > > Scott > > --- Dan Michaels <[email protected]> wrote: > >> The newest Subaru engine that they are using is an >> aircraft engine, it was >> designed for this purpose the plane just did not >> take off. They then put it >> in a car. >> >> Dan >> ----- Original Message ----- >> From: "Scott William" <[email protected]> >> To: <[email protected]>; "KRnet" >> <[email protected]> >> Sent: Monday, October 17, 2005 6:23 AM >> Subject: Re: KR> Eggenfellner engines >> >> >> > Can I simplify this? >> > >> > Auto engines are engineered to spend 80% of thier >> life >> > at 20% throttle. >> > >> > >> > Airplane engines are engineered to spend 80% of >> thier >> > life at 85% throttle. >> > >> > >> > See the difference? >> > >> > Now, some auto engines have inherent design >> > charachteristics that bode them well in airplanes. >> The >> > Corvair is one that is superb. As mentioned below, >> the >> > 2100 VW with a good forged steel crank is a good >> > choice, as is the V6 GM motor. >> > >> > As for all the others.....look how they perform in >> > boats. They don't last long because of the large >> power >> > requirements on them. Hence, you'll never see a >> two >> > bolt main Chevy 350 in a boat. Or a Subaru, for >> that >> > matter. >> > >> > >> > Scott >> > >> > --- Colin Rainey <[email protected]> >> > wrote: >> > >> >> Bob Lester at one time ran a Subaru engine before >> >> changing over to a Corvair. Problems with the >> >> crankshafts due to the high rpms necessary to >> >> produce enough power. Read the Auto Mathbook for >> >> some numbers of projected life expectancy when >> >> engines are subjected to higher and higher rpms. >> >> The Chevy 350 is 3.48 inches in stroke and will >> >> reach a piston speed that at 6500 rpms will >> stress >> >> the crank 4 times what it is at 5500 rpms per the >> >> author of the book. Yet by de-stroking that same >> >> engine as in the Indy cars, it can be revved to >> >> 11,500 and reach the same piston speeds as 6000 >> >> rpms, bringing the same stress to the crank. You >> >> must do the same things to your chosen engine, OR >> >> use an engine that develops more HP than you >> need, >> >> so that your rpms can be maintained at a >> reasonable >> >> level for longevity. The chosen engine needs to >> >> have a broad power band where torque is good >> where >> >> you plan to cruise. Peak Hp does not matter if >> you >> >> cannot stay there for long durations. Remember >> about >> >> takeoffs, climbs while in cruise flight. etc... >> >> >> >> With the complexity with running a liquid cooled >> >> auto engine added to an already complex task of >> >> setting up an engine and then matching a prop to >> it, >> >> the idea of getting reliable information >> concerning >> >> PSRUs and prop matches is nothing short of >> daunting. >> >> The Subarus are reputed to produce X amount of >> HP >> >> but I was not impressed with their presentation >> nor >> >> information, or lack there of at Sun n Fun, from >> the >> >> Eggenfellner group. They seemed full of hipe but >> >> would not talk real world knowledge of their >> >> products. Like REAL hours of use instead of >> >> projected TBO. Their full rated HP falls WAY off >> >> when throttled back for economy cruise. For all >> the >> >> added extras in complexity and weight, you are >> >> better off with a good 2180 VW or Corvair 2.7L. >> The >> >> three best auto engines I have researched that >> are >> >> successful conversions, being used extensively, >> with >> >> LOTS of information available are: 1) the VW >> 2180; >> >> 2) the Corvair 2.7L ; 3) the 4.3V6 GM. By far >> these >> >> engines have way over the numbers of flying >> >> conversions that stay in the planes and the >> owners >> >> express satisfaction with their performance. The >> >> others have smaller numbers, and have short TBOs >> >> like the 2 cycle Rotax family. >> >> >> >> IMHO I would recommend for our birds, stick with >> the >> >> proven power plants and you will fly sooner, be >> >> happier, spend less money, and perform better >> than >> >> these other fancy boat anchors. (Ok maybe not >> boat >> >> anchor, but definitely tie down anchors ). >> >> >> >> >> >> Colin Rainey >> >> [email protected] >> >> EarthLink Revolves Around You. >> >> _______________________________________ >> >> Search the KRnet Archives at >> >> http://www.maddyhome.com/krsrch/index.jsp >> >> to UNsubscribe from KRnet, send a message to >> >> [email protected] >> >> please see other KRnet info at >> >> http://www.krnet.org/info.html >> >> >> > >> > >> > >> > >> > >> > __________________________________ >> > Yahoo! Mail - PC Magazine Editors' Choice 2005 >> > http://mail.yahoo.com >> > >> > _______________________________________ >> > Search the KRnet Archives at >> http://www.maddyhome.com/krsrch/index.jsp >> > to UNsubscribe from KRnet, send a message to >> [email protected] >> > please see other KRnet info at >> http://www.krnet.org/info.html >> > >> > >> > >> > -- >> > No virus found in this incoming message. >> > Checked by AVG Anti-Virus. >> > Version: 7.0.344 / Virus Database: 267.11.14/129 - >> Release Date: >> > 10/11/2005 >> > >> > >> >> >> _______________________________________ >> Search the KRnet Archives at >> http://www.maddyhome.com/krsrch/index.jsp >> to UNsubscribe from KRnet, send a message to >> [email protected] >> please see other KRnet info at >> http://www.krnet.org/info.html >> > > > > > __________________________________ > Start your day with Yahoo! - Make it your home page! > http://www.yahoo.com/r/hs > > _______________________________________ > Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp > to UNsubscribe from KRnet, send a message to [email protected] > please see other KRnet info at http://www.krnet.org/info.html > > > > -- > No virus found in this incoming message. > Checked by AVG Anti-Virus. > Version: 7.0.344 / Virus Database: 267.11.14/129 - Release Date: > 10/11/2005 > >
