Dan: There's a reason Eggenfellner calls them "conversions". They weren't designed to fly....now or ever.
Scott --- Dan Michaels <dmic...@grantsburgtelcom.net> 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" <scot...@yahoo.com> > To: <brokerpilot9...@earthlink.net>; "KRnet" > <kr...@mylist.net> > 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 <brokerpilot9...@earthlink.net> > > 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 > >> brokerpilot9...@earthlink.net > >> EarthLink Revolves Around You. > >> _______________________________________ > >> Search the KRnet Archives at > >> http://www.maddyhome.com/krsrch/index.jsp > >> to UNsubscribe from KRnet, send a message to > >> krnet-le...@mylist.net > >> 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 > krnet-le...@mylist.net > > 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 > krnet-le...@mylist.net > 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
