I have a Subaru EJ22 150hp and it cruises at 165 mph no pants and tops out over 210 mph wide open and weighing in at about 1200 full fuel. You will probably see 250 mph with pants and 200 hp --- Mark Wegmet <markweg...@charter.net> wrote:
> Mark L; > > I'm glad to see that you have something that > performs the way you expected. > Do you have any estimates on the hp@rpm and or > ft/lbs of torque profiles for > this configuration (I know, not easy to get without > a Dyno). The reason I > ask is that I have been considering a 13B Mazda > rotary @ about 200 hp with a > PSR unit and all of the wheel pants, fairings, etc., > to make this a "go" > project; what does everyone think? > > Thanks, > Mark > The beginner: N952MW res. > > -----Original Message----- > From: krnet-boun...@mylist.net > [mailto:krnet-boun...@mylist.net] On Behalf > Of Mark Langford > Sent: Tuesday, March 13, 2007 10:45 PM > To: KRnet > Cc: Corvair engines for homebuilt aircraft > Subject: KR> 3100cc vs 2700cc Corvair engines > > VairHeads, > > Yesterday was a calm day, so I did a four way GPS > run at 7500' at wide open > throttle to see what the new 3100cc engine would do. > Bottom line was 172 > mph at 3740 rpm, which agrees nicely with indicated > airspeed after pressure > and temperature correction (TAS). If nothing else, > this proves my airspeed > indicator is deadly accurate, since I got this same > number this weekend > without the GPS. I found a similar run done last > April using the 2700cc > engine, where I got 160 mph at 3390 rpm. That's a > 12 mph difference (which > is about what I'd expect) and a 350 rpm gain. > > These two runs were at almost identical temperature > and pressure conditions, > but a year apart. Fuel consumption was 7.2 gph vs > 6.0 gph. This was using > a Sensenich 54 x 54" prop in both cases, but I have > added a spinner since > then. I did some pretty good comparisons of the > spinner improvement then, > and concluded that the spinner only helped 1-2 mph > at best (if that much), > so it looks like a 10-11 mph improvement, which is > exactly what I expected. > The fuel increase represents a 20% increase in power > over the stocker, which > is also about what I would have expected, given the > 15% increase in > displacement and higher rpm. So I think it's pretty > safe to say that a > typical KR will get a 10 mph increase in speed with > a 3100cc engine. > > In the same breath, let me say that I will run this > thing wide open maybe 1% > of the time, so you figure out if it's worth it to > you. I will say that the > climb rate is fairly breathtaking. I now have the > equivalent of a "war > power" setting on my throttle, but I plan to save it > for an appropriate > occasion, such as the next time my manhood is > challenged! Wheel pants, gear > leg fairings, and wing/stub gap seals that don't > flap in the breeze will > improve this to the extent that 190 mph should be > attainable. A better > matched prop holds some promise as well. See > http://home.hiwaay.net/~langford/corvair/phoenix/ > for details on this > particular incarnation of the 3100cc engine... > > 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 > Post photos, introductions, and For Sale items to > http://www.kr2forum.com/phpBB2/index.php > please see other KRnet info at > http://www.krnet.org/info.html > > > -- > No virus found in this incoming message. > Checked by AVG Free Edition. > Version: 7.5.446 / Virus Database: 268.18.11/722 - > Release Date: 3/14/2007 > 3:38 PM > > > _______________________________________ > Search the KRnet Archives at > http://www.maddyhome.com/krsrch/index.jsp > to UNsubscribe from KRnet, send a message to > krnet-le...@mylist.net > Post photos, introductions, and For Sale items to > http://www.kr2forum.com/phpBB2/index.php > please see other KRnet info at > http://www.krnet.org/info.html > ____________________________________________________________________________________ Sucker-punch spam with award-winning protection. Try the free Yahoo! Mail Beta. http://advision.webevents.yahoo.com/mailbeta/features_spam.html
