flyrotary@lancaironline.net Mailing List Archive

Thanks Ed. I am pleased you verified my concern after my cooling skyrocketing yesterday when I went to full power. Trying to determine where the restriction is now. You are the best. Sent from my iPhone 4 On Aug 22, 2012, at 4:48 PM, "Ed Anderson" <eanderson@carolina.rr.com> wrote: > Chris, One thing to be checking on your next take off is your coolant/oil temps. As you know take-off is the worst combination of low cooling air mass flow and max engine temperature due to WOT. > > You would be surprised how quickly (with the additional power you now have) you will exceed your cooling limits if not careful. So I would be certain to check the temps at a frequent rate on your next take-off until you know how the system is going to react - hate to see you cook your engine during your first real Turbo climb out. > > I find for my Rv-6A that I needed to get to 120 mph IAS as quick as possible to get on the good side of the cooling curve. So that generally meant take off - get safely above surround obstructions, then level off/reduce climb until airspeed hit 120. Then I could resume climb with cooling gradually bring the temps down as altitude and airflow increased. Your sweet spot airspeed would undoubtedly be different given different platform and cooling set up. > > Ed > > -------------------------------------------------- > From: "Chris Barber" <cbarber@texasattorney.net> > Sent: Monday, August 20, 2012 9:17 PM > To: "Rotary motors in aircraft" <flyrotary@lancaironline.net> > Subject: [FlyRotary] Turbo question. > >> As I have mentioned I have had what I think are incongruent readings regarding my manifold pressure (mp)and engine rpm. It seems I am getting quite low mp as I add power to higher rpm. >> >> I am not well versed in this area but my thought is that as I add power, even with slight boost (currently using a 3 lb spring in my wastegate) eventually my mp should raise a bit more. >> >> Today I did some static test. I recorded engine RPM with the turbo hooked up and recorded the mp at 1000 rpm increments. Then I removed the turbo plumbing from my intake and recorded the same info My results currently confuse me. >> >> With the turbo hooked up I am getting >> >> RPM. MP inches >> 2000 - 14.0 >> 3000 - 15.5 >> 4000 - 19.3 >> 5000 - 21.6 >> 5700 - 24.5 (topped out) >> >> With the turbo removed. >> >> 2000 - 15.8 >> 3000 - 15.3 >> 4000 - 19.7 >> 5000 - 24.8 >> 5833 - 29.8 >> >> Is this indicative of restriction in my plumbing? Perhaps in the inter cooler? A dirty air filter? A bad pop off valve or a leak not allowing the air pressure getting to the intake. Or???? >> >> I am uncertain what other permitters I need to check and provide. I am just starting my diagnosis in my Phase One testing. I only have 1.6 hours in the air so far. I value ya'll's direction and input. >> >> Heck, perhaps this is working properly but it just doesn't seem right/comfortable. >> >> Thanks folks. >> >> Chris Barber >> Houston >> Velocity SE >> Rotary 13b turbo (?) :-) >> >> >> >> Sent from my iPhone 4 >> -- >> Homepage: http://www.flyrotary.com/ >> Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html >> >> >> ----- >> No virus found in this message. >> Checked by AVG - www.avg.com >> Version: 2012.0.2197 / Virus Database: 2437/5211 - Release Date: 08/20/12 >> > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html