Wow!!!!!!! Bob Glidden Eminence,Indiana KR2S N181FW (building) Corvair 110 glid...@ccrtc.com ----- Original Message ----- From: "D F Lively" <riksh...@interl.net> To: "KRnet" <kr...@mylist.net> Sent: Friday, August 04, 2006 3:40 PM Subject: Re: KR> Subaru engines
> Netters: > > You raised some valid questions. I have looked @ Subies and observed that > they > get Max torque somewhere in the low 4000s rpm range and Max power at say > the > mid 5000s rpm range. Almost all would requre a PSRU because their bearing > wont > take the prop pull. I would say that running that engine at max torque > for a > redline might have some durability issues as most in cars driver at > highway > speeds run in the 3000 rpm range so my thoughts are that limitting the > revs to > the mid or upper 3000s would be prudent and a PSRU ratio to give a prop > rpm in > the 2700 to 3000 range appropriate for durability. Whether this would > leed to > adequate power availability I can not say. What I liked about the Subi is > the > fact it is liquid cooled which would be nice for cabin heat with NO or a > very > limited risk of CO poisoning. > > I think one must look at the RPM settings of the design and the PSRU > ratios > involved to evaluate engine logevity becuse clearly running an engine at > or > above its max torque RPM will surely work a hardship on engine life as a > general rule. > > My opinion from a reasoned judgement not from experience or personal > knowledge. > > IT is a Safe bet that neither the Corvair or VW based engines will last as > many > hours as they do normally if ran "Flat Out" either. > > > Don > ------------------------------------------------------------------------ > > Mark Langford wrote: > >> Fred Johnson wrote: >> >> > Hey Mark, since it is so quiet today, do you know of anyone >> > successfully >> > using either a Subaru or Geo engine in a KR? >> >> Steve Makish and Bob Lester have a lot of hours on a Subaru (don't know >> exactly which one). They were big proponents until Steve wore his case >> out >> a couple of times at about 300 hours. His opinion is that they can't >> take >> the RPMs, and are not worth the trouble. He's now flying a Corvair. >> He's >> not on the list but his email address is srmak...@aol.com if want to >> email >> him direct and ask his opinion. >> >> Yes Ken Thomas also had a Subaru and is now running a Jabiru, and is >> happy >> with it. Dave Stroud weighed a Subaru engine installation firewall >> forward >> and came up with 285 pounds, substantially more than "they" tell you >> it'll >> weigh. The Corvair is about 245, by comparison. >> >> My 2 cents worth, but I've never flown behind a Subaru, so take it for >> what >> it's worth... >> >> Mark Langford, Huntsville, Alabama >> see KR2S project N56ML at http://home.hiwaay.net/~langford >> email to N56ML "at" hiwaay.net >> -------------------------------------------------------------- >> >> _______________________________________ >> 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 > _______________________________________ > 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 >
