lml@lancaironline.net Mailing List Archive

Pat: Well done! Next time, try 2700 and 38" MP all the way to FL200 and enjoy the still further enhanced rate of climb. If you keep it rich enough during the climb, the peak cylinder pressures will be the same as you had the last trip - - and you will climb a lot faster. Regards, George -----Original Message----- From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Pat and Sue Brunner Sent: Monday, November 01, 2004 7:06 PM To: Lancair Mailing List Subject: [LML] Cooling the TSIO550/fuel starvation with change of fuel tank Since attending the cooling show put on by George Braly in Ada , I have implemented most of the changes suggested. With the exception of the heat shields for the turbo's and exhaust stacks, I have manufactured lower cyclinder ducts for the front and rear cyclinders, opened a hole for the #5 cyclinder with a diverter and made a channel for the air to move around the flat spot in the #2 cyclinder inside of the oil cooler box. In addition, I reset the fuel flow at take off power to 45.3 GPH. Last week I made a trip from California to Wisconsin and back. With a climb at 140 Kts indicated, Gross weight, the VSI was showing 1200 to 1500 FPM all the way to FL200. The cyclinders never got over 375 degrees with a MP of 34" and 2600 RPM. In the past the routine was 160 Kts indicated and 500 to 800 FPM with the temps going to 390 to 400. In cruise flight the temps were just as good with maybe a little to large a hole in the #5 baffle. All temps in the 330 range or lower. #5 was showing 296 at FL200 with an OS temp of +10f. I will close the opening for the #5 cyclinder about a third. This is a great improvement and my thanks to the ADA group for their very generous contribution. Been watching the arguments about plenums with interest, but with these modifications I can't see any need for going to those extremes. An old issue is still plagueing me, when switching fuel tanks, ususally only once a trip, the engine falters for 3-8 seconds, finally catches and it does not occur again on subsequent tank changes in that flight. Stop enroute, full fuel and climb to altitude and it may or maynot occur. I have moved the fuel pump to the lowest location on the side panel, replaced the fuel selector with an andair, inspected all lines for leaks and still I at a loss to explain it. The lines from the tank are 3/8" as opposed to the current lines which are 1/2". Would appreciate any thoughts the group has. Pat Brunner N98PB IVP 524Hours -- For archives and unsub http://mail.lancaironline.net/lists/lml/ --- Incoming mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.782 / Virus Database: 528 - Release Date: 10/22/2004 --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.782 / Virus Database: 528 - Release Date: 10/22/2004